diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kvm/x86.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/kvm/x86.c | 6607 |
1 files changed, 0 insertions, 6607 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kvm/x86.c b/ANDROID_3.4.5/arch/x86/kvm/x86.c deleted file mode 100644 index 185a2b82..00000000 --- a/ANDROID_3.4.5/arch/x86/kvm/x86.c +++ /dev/null @@ -1,6607 +0,0 @@ -/* - * Kernel-based Virtual Machine driver for Linux - * - * derived from drivers/kvm/kvm_main.c - * - * Copyright (C) 2006 Qumranet, Inc. - * Copyright (C) 2008 Qumranet, Inc. - * Copyright IBM Corporation, 2008 - * Copyright 2010 Red Hat, Inc. and/or its affiliates. - * - * Authors: - * Avi Kivity <avi@qumranet.com> - * Yaniv Kamay <yaniv@qumranet.com> - * Amit Shah <amit.shah@qumranet.com> - * Ben-Ami Yassour <benami@il.ibm.com> - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - * - */ - -#include <linux/kvm_host.h> -#include "irq.h" -#include "mmu.h" -#include "i8254.h" -#include "tss.h" -#include "kvm_cache_regs.h" -#include "x86.h" -#include "cpuid.h" - -#include <linux/clocksource.h> -#include <linux/interrupt.h> -#include <linux/kvm.h> -#include <linux/fs.h> -#include <linux/vmalloc.h> -#include <linux/module.h> -#include <linux/mman.h> -#include <linux/highmem.h> -#include <linux/iommu.h> -#include <linux/intel-iommu.h> -#include <linux/cpufreq.h> -#include <linux/user-return-notifier.h> -#include <linux/srcu.h> -#include <linux/slab.h> -#include <linux/perf_event.h> -#include <linux/uaccess.h> -#include <linux/hash.h> -#include <linux/pci.h> -#include <trace/events/kvm.h> - -#define CREATE_TRACE_POINTS -#include "trace.h" - -#include <asm/debugreg.h> -#include <asm/msr.h> -#include <asm/desc.h> -#include <asm/mtrr.h> -#include <asm/mce.h> -#include <asm/i387.h> -#include <asm/fpu-internal.h> /* Ugh! */ -#include <asm/xcr.h> -#include <asm/pvclock.h> -#include <asm/div64.h> - -#define MAX_IO_MSRS 256 -#define KVM_MAX_MCE_BANKS 32 -#define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P) - -#define emul_to_vcpu(ctxt) \ - container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt) - -/* EFER defaults: - * - enable syscall per default because its emulated by KVM - * - enable LME and LMA per default on 64 bit KVM - */ -#ifdef CONFIG_X86_64 -static -u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA)); -#else -static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE); -#endif - -#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM -#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU - -static void update_cr8_intercept(struct kvm_vcpu *vcpu); -static void process_nmi(struct kvm_vcpu *vcpu); - -struct kvm_x86_ops *kvm_x86_ops; -EXPORT_SYMBOL_GPL(kvm_x86_ops); - -static bool ignore_msrs = 0; -module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR); - -bool kvm_has_tsc_control; -EXPORT_SYMBOL_GPL(kvm_has_tsc_control); -u32 kvm_max_guest_tsc_khz; -EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz); - -/* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */ -static u32 tsc_tolerance_ppm = 250; -module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR); - -#define KVM_NR_SHARED_MSRS 16 - -struct kvm_shared_msrs_global { - int nr; - u32 msrs[KVM_NR_SHARED_MSRS]; -}; - -struct kvm_shared_msrs { - struct user_return_notifier urn; - bool registered; - struct kvm_shared_msr_values { - u64 host; - u64 curr; - } values[KVM_NR_SHARED_MSRS]; -}; - -static struct kvm_shared_msrs_global __read_mostly shared_msrs_global; -static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs); - -struct kvm_stats_debugfs_item debugfs_entries[] = { - { "pf_fixed", VCPU_STAT(pf_fixed) }, - { "pf_guest", VCPU_STAT(pf_guest) }, - { "tlb_flush", VCPU_STAT(tlb_flush) }, - { "invlpg", VCPU_STAT(invlpg) }, - { "exits", VCPU_STAT(exits) }, - { "io_exits", VCPU_STAT(io_exits) }, - { "mmio_exits", VCPU_STAT(mmio_exits) }, - { "signal_exits", VCPU_STAT(signal_exits) }, - { "irq_window", VCPU_STAT(irq_window_exits) }, - { "nmi_window", VCPU_STAT(nmi_window_exits) }, - { "halt_exits", VCPU_STAT(halt_exits) }, - { "halt_wakeup", VCPU_STAT(halt_wakeup) }, - { "hypercalls", VCPU_STAT(hypercalls) }, - { "request_irq", VCPU_STAT(request_irq_exits) }, - { "irq_exits", VCPU_STAT(irq_exits) }, - { "host_state_reload", VCPU_STAT(host_state_reload) }, - { "efer_reload", VCPU_STAT(efer_reload) }, - { "fpu_reload", VCPU_STAT(fpu_reload) }, - { "insn_emulation", VCPU_STAT(insn_emulation) }, - { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, - { "irq_injections", VCPU_STAT(irq_injections) }, - { "nmi_injections", VCPU_STAT(nmi_injections) }, - { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, - { "mmu_pte_write", VM_STAT(mmu_pte_write) }, - { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, - { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, - { "mmu_flooded", VM_STAT(mmu_flooded) }, - { "mmu_recycled", VM_STAT(mmu_recycled) }, - { "mmu_cache_miss", VM_STAT(mmu_cache_miss) }, - { "mmu_unsync", VM_STAT(mmu_unsync) }, - { "remote_tlb_flush", VM_STAT(remote_tlb_flush) }, - { "largepages", VM_STAT(lpages) }, - { NULL } -}; - -u64 __read_mostly host_xcr0; - -int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); - -static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) -{ - int i; - for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++) - vcpu->arch.apf.gfns[i] = ~0; -} - -static void kvm_on_user_return(struct user_return_notifier *urn) -{ - unsigned slot; - struct kvm_shared_msrs *locals - = container_of(urn, struct kvm_shared_msrs, urn); - struct kvm_shared_msr_values *values; - - for (slot = 0; slot < shared_msrs_global.nr; ++slot) { - values = &locals->values[slot]; - if (values->host != values->curr) { - wrmsrl(shared_msrs_global.msrs[slot], values->host); - values->curr = values->host; - } - } - locals->registered = false; - user_return_notifier_unregister(urn); -} - -static void shared_msr_update(unsigned slot, u32 msr) -{ - struct kvm_shared_msrs *smsr; - u64 value; - - smsr = &__get_cpu_var(shared_msrs); - /* only read, and nobody should modify it at this time, - * so don't need lock */ - if (slot >= shared_msrs_global.nr) { - printk(KERN_ERR "kvm: invalid MSR slot!"); - return; - } - rdmsrl_safe(msr, &value); - smsr->values[slot].host = value; - smsr->values[slot].curr = value; -} - -void kvm_define_shared_msr(unsigned slot, u32 msr) -{ - if (slot >= shared_msrs_global.nr) - shared_msrs_global.nr = slot + 1; - shared_msrs_global.msrs[slot] = msr; - /* we need ensured the shared_msr_global have been updated */ - smp_wmb(); -} -EXPORT_SYMBOL_GPL(kvm_define_shared_msr); - -static void kvm_shared_msr_cpu_online(void) -{ - unsigned i; - - for (i = 0; i < shared_msrs_global.nr; ++i) - shared_msr_update(i, shared_msrs_global.msrs[i]); -} - -void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) -{ - struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs); - - if (((value ^ smsr->values[slot].curr) & mask) == 0) - return; - smsr->values[slot].curr = value; - wrmsrl(shared_msrs_global.msrs[slot], value); - if (!smsr->registered) { - smsr->urn.on_user_return = kvm_on_user_return; - user_return_notifier_register(&smsr->urn); - smsr->registered = true; - } -} -EXPORT_SYMBOL_GPL(kvm_set_shared_msr); - -static void drop_user_return_notifiers(void *ignore) -{ - struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs); - - if (smsr->registered) - kvm_on_user_return(&smsr->urn); -} - -u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) -{ - if (irqchip_in_kernel(vcpu->kvm)) - return vcpu->arch.apic_base; - else - return vcpu->arch.apic_base; -} -EXPORT_SYMBOL_GPL(kvm_get_apic_base); - -void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data) -{ - /* TODO: reserve bits check */ - if (irqchip_in_kernel(vcpu->kvm)) - kvm_lapic_set_base(vcpu, data); - else - vcpu->arch.apic_base = data; -} -EXPORT_SYMBOL_GPL(kvm_set_apic_base); - -#define EXCPT_BENIGN 0 -#define EXCPT_CONTRIBUTORY 1 -#define EXCPT_PF 2 - -static int exception_class(int vector) -{ - switch (vector) { - case PF_VECTOR: - return EXCPT_PF; - case DE_VECTOR: - case TS_VECTOR: - case NP_VECTOR: - case SS_VECTOR: - case GP_VECTOR: - return EXCPT_CONTRIBUTORY; - default: - break; - } - return EXCPT_BENIGN; -} - -static void kvm_multiple_exception(struct kvm_vcpu *vcpu, - unsigned nr, bool has_error, u32 error_code, - bool reinject) -{ - u32 prev_nr; - int class1, class2; - - kvm_make_request(KVM_REQ_EVENT, vcpu); - - if (!vcpu->arch.exception.pending) { - queue: - vcpu->arch.exception.pending = true; - vcpu->arch.exception.has_error_code = has_error; - vcpu->arch.exception.nr = nr; - vcpu->arch.exception.error_code = error_code; - vcpu->arch.exception.reinject = reinject; - return; - } - - /* to check exception */ - prev_nr = vcpu->arch.exception.nr; - if (prev_nr == DF_VECTOR) { - /* triple fault -> shutdown */ - kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); - return; - } - class1 = exception_class(prev_nr); - class2 = exception_class(nr); - if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) - || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) { - /* generate double fault per SDM Table 5-5 */ - vcpu->arch.exception.pending = true; - vcpu->arch.exception.has_error_code = true; - vcpu->arch.exception.nr = DF_VECTOR; - vcpu->arch.exception.error_code = 0; - } else - /* replace previous exception with a new one in a hope - that instruction re-execution will regenerate lost - exception */ - goto queue; -} - -void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) -{ - kvm_multiple_exception(vcpu, nr, false, 0, false); -} -EXPORT_SYMBOL_GPL(kvm_queue_exception); - -void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr) -{ - kvm_multiple_exception(vcpu, nr, false, 0, true); -} -EXPORT_SYMBOL_GPL(kvm_requeue_exception); - -void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err) -{ - if (err) - kvm_inject_gp(vcpu, 0); - else - kvm_x86_ops->skip_emulated_instruction(vcpu); -} -EXPORT_SYMBOL_GPL(kvm_complete_insn_gp); - -void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) -{ - ++vcpu->stat.pf_guest; - vcpu->arch.cr2 = fault->address; - kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code); -} -EXPORT_SYMBOL_GPL(kvm_inject_page_fault); - -void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) -{ - if (mmu_is_nested(vcpu) && !fault->nested_page_fault) - vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault); - else - vcpu->arch.mmu.inject_page_fault(vcpu, fault); -} - -void kvm_inject_nmi(struct kvm_vcpu *vcpu) -{ - atomic_inc(&vcpu->arch.nmi_queued); - kvm_make_request(KVM_REQ_NMI, vcpu); -} -EXPORT_SYMBOL_GPL(kvm_inject_nmi); - -void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) -{ - kvm_multiple_exception(vcpu, nr, true, error_code, false); -} -EXPORT_SYMBOL_GPL(kvm_queue_exception_e); - -void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) -{ - kvm_multiple_exception(vcpu, nr, true, error_code, true); -} -EXPORT_SYMBOL_GPL(kvm_requeue_exception_e); - -/* - * Checks if cpl <= required_cpl; if true, return true. Otherwise queue - * a #GP and return false. - */ -bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) -{ - if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl) - return true; - kvm_queue_exception_e(vcpu, GP_VECTOR, 0); - return false; -} -EXPORT_SYMBOL_GPL(kvm_require_cpl); - -/* - * This function will be used to read from the physical memory of the currently - * running guest. The difference to kvm_read_guest_page is that this function - * can read from guest physical or from the guest's guest physical memory. - */ -int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, - gfn_t ngfn, void *data, int offset, int len, - u32 access) -{ - gfn_t real_gfn; - gpa_t ngpa; - - ngpa = gfn_to_gpa(ngfn); - real_gfn = mmu->translate_gpa(vcpu, ngpa, access); - if (real_gfn == UNMAPPED_GVA) - return -EFAULT; - - real_gfn = gpa_to_gfn(real_gfn); - - return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len); -} -EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu); - -int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, - void *data, int offset, int len, u32 access) -{ - return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn, - data, offset, len, access); -} - -/* - * Load the pae pdptrs. Return true is they are all valid. - */ -int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) -{ - gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; - unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; - int i; - int ret; - u64 pdpte[ARRAY_SIZE(mmu->pdptrs)]; - - ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte, - offset * sizeof(u64), sizeof(pdpte), - PFERR_USER_MASK|PFERR_WRITE_MASK); - if (ret < 0) { - ret = 0; - goto out; - } - for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { - if (is_present_gpte(pdpte[i]) && - (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) { - ret = 0; - goto out; - } - } - ret = 1; - - memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)); - __set_bit(VCPU_EXREG_PDPTR, - (unsigned long *)&vcpu->arch.regs_avail); - __set_bit(VCPU_EXREG_PDPTR, - (unsigned long *)&vcpu->arch.regs_dirty); -out: - - return ret; -} -EXPORT_SYMBOL_GPL(load_pdptrs); - -static bool pdptrs_changed(struct kvm_vcpu *vcpu) -{ - u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)]; - bool changed = true; - int offset; - gfn_t gfn; - int r; - - if (is_long_mode(vcpu) || !is_pae(vcpu)) - return false; - - if (!test_bit(VCPU_EXREG_PDPTR, - (unsigned long *)&vcpu->arch.regs_avail)) - return true; - - gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT; - offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1); - r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte), - PFERR_USER_MASK | PFERR_WRITE_MASK); - if (r < 0) - goto out; - changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0; -out: - - return changed; -} - -int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) -{ - unsigned long old_cr0 = kvm_read_cr0(vcpu); - unsigned long update_bits = X86_CR0_PG | X86_CR0_WP | - X86_CR0_CD | X86_CR0_NW; - - cr0 |= X86_CR0_ET; - -#ifdef CONFIG_X86_64 - if (cr0 & 0xffffffff00000000UL) - return 1; -#endif - - cr0 &= ~CR0_RESERVED_BITS; - - if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) - return 1; - - if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) - return 1; - - if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { -#ifdef CONFIG_X86_64 - if ((vcpu->arch.efer & EFER_LME)) { - int cs_db, cs_l; - - if (!is_pae(vcpu)) - return 1; - kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); - if (cs_l) - return 1; - } else -#endif - if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, - kvm_read_cr3(vcpu))) - return 1; - } - - kvm_x86_ops->set_cr0(vcpu, cr0); - - if ((cr0 ^ old_cr0) & X86_CR0_PG) { - kvm_clear_async_pf_completion_queue(vcpu); - kvm_async_pf_hash_reset(vcpu); - } - - if ((cr0 ^ old_cr0) & update_bits) - kvm_mmu_reset_context(vcpu); - return 0; -} -EXPORT_SYMBOL_GPL(kvm_set_cr0); - -void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) -{ - (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f)); -} -EXPORT_SYMBOL_GPL(kvm_lmsw); - -int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) -{ - u64 xcr0; - - /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */ - if (index != XCR_XFEATURE_ENABLED_MASK) - return 1; - xcr0 = xcr; - if (kvm_x86_ops->get_cpl(vcpu) != 0) - return 1; - if (!(xcr0 & XSTATE_FP)) - return 1; - if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE)) - return 1; - if (xcr0 & ~host_xcr0) - return 1; - vcpu->arch.xcr0 = xcr0; - vcpu->guest_xcr0_loaded = 0; - return 0; -} - -int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) -{ - if (__kvm_set_xcr(vcpu, index, xcr)) { - kvm_inject_gp(vcpu, 0); - return 1; - } - return 0; -} -EXPORT_SYMBOL_GPL(kvm_set_xcr); - -int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) -{ - unsigned long old_cr4 = kvm_read_cr4(vcpu); - unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | - X86_CR4_PAE | X86_CR4_SMEP; - if (cr4 & CR4_RESERVED_BITS) - return 1; - - if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE)) - return 1; - - if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP)) - return 1; - - if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_RDWRGSFS)) - return 1; - - if (is_long_mode(vcpu)) { - if (!(cr4 & X86_CR4_PAE)) - return 1; - } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) - && ((cr4 ^ old_cr4) & pdptr_bits) - && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, - kvm_read_cr3(vcpu))) - return 1; - - if (kvm_x86_ops->set_cr4(vcpu, cr4)) - return 1; - - if ((cr4 ^ old_cr4) & pdptr_bits) - kvm_mmu_reset_context(vcpu); - - if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE) - kvm_update_cpuid(vcpu); - - return 0; -} -EXPORT_SYMBOL_GPL(kvm_set_cr4); - -int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) -{ - if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) { - kvm_mmu_sync_roots(vcpu); - kvm_mmu_flush_tlb(vcpu); - return 0; - } - - if (is_long_mode(vcpu)) { - if (cr3 & CR3_L_MODE_RESERVED_BITS) - return 1; - } else { - if (is_pae(vcpu)) { - if (cr3 & CR3_PAE_RESERVED_BITS) - return 1; - if (is_paging(vcpu) && - !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) - return 1; - } - /* - * We don't check reserved bits in nonpae mode, because - * this isn't enforced, and VMware depends on this. - */ - } - - /* - * Does the new cr3 value map to physical memory? (Note, we - * catch an invalid cr3 even in real-mode, because it would - * cause trouble later on when we turn on paging anyway.) - * - * A real CPU would silently accept an invalid cr3 and would - * attempt to use it - with largely undefined (and often hard - * to debug) behavior on the guest side. - */ - if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT))) - return 1; - vcpu->arch.cr3 = cr3; - __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); - vcpu->arch.mmu.new_cr3(vcpu); - return 0; -} -EXPORT_SYMBOL_GPL(kvm_set_cr3); - -int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) -{ - if (cr8 & CR8_RESERVED_BITS) - return 1; - if (irqchip_in_kernel(vcpu->kvm)) - kvm_lapic_set_tpr(vcpu, cr8); - else - vcpu->arch.cr8 = cr8; - return 0; -} -EXPORT_SYMBOL_GPL(kvm_set_cr8); - -unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) -{ - if (irqchip_in_kernel(vcpu->kvm)) - return kvm_lapic_get_cr8(vcpu); - else - return vcpu->arch.cr8; -} -EXPORT_SYMBOL_GPL(kvm_get_cr8); - -static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) -{ - switch (dr) { - case 0 ... 3: - vcpu->arch.db[dr] = val; - if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) - vcpu->arch.eff_db[dr] = val; - break; - case 4: - if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) - return 1; /* #UD */ - /* fall through */ - case 6: - if (val & 0xffffffff00000000ULL) - return -1; /* #GP */ - vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1; - break; - case 5: - if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) - return 1; /* #UD */ - /* fall through */ - default: /* 7 */ - if (val & 0xffffffff00000000ULL) - return -1; /* #GP */ - vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; - if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { - kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7); - vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK); - } - break; - } - - return 0; -} - -int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) -{ - int res; - - res = __kvm_set_dr(vcpu, dr, val); - if (res > 0) - kvm_queue_exception(vcpu, UD_VECTOR); - else if (res < 0) - kvm_inject_gp(vcpu, 0); - - return res; -} -EXPORT_SYMBOL_GPL(kvm_set_dr); - -static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) -{ - switch (dr) { - case 0 ... 3: - *val = vcpu->arch.db[dr]; - break; - case 4: - if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) - return 1; - /* fall through */ - case 6: - *val = vcpu->arch.dr6; - break; - case 5: - if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) - return 1; - /* fall through */ - default: /* 7 */ - *val = vcpu->arch.dr7; - break; - } - - return 0; -} - -int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) -{ - if (_kvm_get_dr(vcpu, dr, val)) { - kvm_queue_exception(vcpu, UD_VECTOR); - return 1; - } - return 0; -} -EXPORT_SYMBOL_GPL(kvm_get_dr); - -bool kvm_rdpmc(struct kvm_vcpu *vcpu) -{ - u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX); - u64 data; - int err; - - err = kvm_pmu_read_pmc(vcpu, ecx, &data); - if (err) - return err; - kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data); - kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32); - return err; -} -EXPORT_SYMBOL_GPL(kvm_rdpmc); - -/* - * List of msr numbers which we expose to userspace through KVM_GET_MSRS - * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. - * - * This list is modified at module load time to reflect the - * capabilities of the host cpu. This capabilities test skips MSRs that are - * kvm-specific. Those are put in the beginning of the list. - */ - -#define KVM_SAVE_MSRS_BEGIN 9 -static u32 msrs_to_save[] = { - MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, - MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW, - HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, - HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, - MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, - MSR_STAR, -#ifdef CONFIG_X86_64 - MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, -#endif - MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA -}; - -static unsigned num_msrs_to_save; - -static u32 emulated_msrs[] = { - MSR_IA32_TSCDEADLINE, - MSR_IA32_MISC_ENABLE, - MSR_IA32_MCG_STATUS, - MSR_IA32_MCG_CTL, -}; - -static int set_efer(struct kvm_vcpu *vcpu, u64 efer) -{ - u64 old_efer = vcpu->arch.efer; - - if (efer & efer_reserved_bits) - return 1; - - if (is_paging(vcpu) - && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME)) - return 1; - - if (efer & EFER_FFXSR) { - struct kvm_cpuid_entry2 *feat; - - feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); - if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT))) - return 1; - } - - if (efer & EFER_SVME) { - struct kvm_cpuid_entry2 *feat; - - feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); - if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM))) - return 1; - } - - efer &= ~EFER_LMA; - efer |= vcpu->arch.efer & EFER_LMA; - - kvm_x86_ops->set_efer(vcpu, efer); - - vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled; - - /* Update reserved bits */ - if ((efer ^ old_efer) & EFER_NX) - kvm_mmu_reset_context(vcpu); - - return 0; -} - -void kvm_enable_efer_bits(u64 mask) -{ - efer_reserved_bits &= ~mask; -} -EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); - - -/* - * Writes msr value into into the appropriate "register". - * Returns 0 on success, non-0 otherwise. - * Assumes vcpu_load() was already called. - */ -int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) -{ - return kvm_x86_ops->set_msr(vcpu, msr_index, data); -} - -/* - * Adapt set_msr() to msr_io()'s calling convention - */ -static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) -{ - return kvm_set_msr(vcpu, index, *data); -} - -static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) -{ - int version; - int r; - struct pvclock_wall_clock wc; - struct timespec boot; - - if (!wall_clock) - return; - - r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version)); - if (r) - return; - - if (version & 1) - ++version; /* first time write, random junk */ - - ++version; - - kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); - - /* - * The guest calculates current wall clock time by adding - * system time (updated by kvm_guest_time_update below) to the - * wall clock specified here. guest system time equals host - * system time for us, thus we must fill in host boot time here. - */ - getboottime(&boot); - - wc.sec = boot.tv_sec; - wc.nsec = boot.tv_nsec; - wc.version = version; - - kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc)); - - version++; - kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); -} - -static uint32_t div_frac(uint32_t dividend, uint32_t divisor) -{ - uint32_t quotient, remainder; - - /* Don't try to replace with do_div(), this one calculates - * "(dividend << 32) / divisor" */ - __asm__ ( "divl %4" - : "=a" (quotient), "=d" (remainder) - : "0" (0), "1" (dividend), "r" (divisor) ); - return quotient; -} - -static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz, - s8 *pshift, u32 *pmultiplier) -{ - uint64_t scaled64; - int32_t shift = 0; - uint64_t tps64; - uint32_t tps32; - - tps64 = base_khz * 1000LL; - scaled64 = scaled_khz * 1000LL; - while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) { - tps64 >>= 1; - shift--; - } - - tps32 = (uint32_t)tps64; - while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) { - if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000) - scaled64 >>= 1; - else - tps32 <<= 1; - shift++; - } - - *pshift = shift; - *pmultiplier = div_frac(scaled64, tps32); - - pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n", - __func__, base_khz, scaled_khz, shift, *pmultiplier); -} - -static inline u64 get_kernel_ns(void) -{ - struct timespec ts; - - WARN_ON(preemptible()); - ktime_get_ts(&ts); - monotonic_to_bootbased(&ts); - return timespec_to_ns(&ts); -} - -static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); -unsigned long max_tsc_khz; - -static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec) -{ - return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult, - vcpu->arch.virtual_tsc_shift); -} - -static u32 adjust_tsc_khz(u32 khz, s32 ppm) -{ - u64 v = (u64)khz * (1000000 + ppm); - do_div(v, 1000000); - return v; -} - -static void kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 this_tsc_khz) -{ - u32 thresh_lo, thresh_hi; - int use_scaling = 0; - - /* Compute a scale to convert nanoseconds in TSC cycles */ - kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000, - &vcpu->arch.virtual_tsc_shift, - &vcpu->arch.virtual_tsc_mult); - vcpu->arch.virtual_tsc_khz = this_tsc_khz; - - /* - * Compute the variation in TSC rate which is acceptable - * within the range of tolerance and decide if the - * rate being applied is within that bounds of the hardware - * rate. If so, no scaling or compensation need be done. - */ - thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm); - thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm); - if (this_tsc_khz < thresh_lo || this_tsc_khz > thresh_hi) { - pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", this_tsc_khz, thresh_lo, thresh_hi); - use_scaling = 1; - } - kvm_x86_ops->set_tsc_khz(vcpu, this_tsc_khz, use_scaling); -} - -static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns) -{ - u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec, - vcpu->arch.virtual_tsc_mult, - vcpu->arch.virtual_tsc_shift); - tsc += vcpu->arch.this_tsc_write; - return tsc; -} - -void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data) -{ - struct kvm *kvm = vcpu->kvm; - u64 offset, ns, elapsed; - unsigned long flags; - s64 usdiff; - - raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); - offset = kvm_x86_ops->compute_tsc_offset(vcpu, data); - ns = get_kernel_ns(); - elapsed = ns - kvm->arch.last_tsc_nsec; - - /* n.b - signed multiplication and division required */ - usdiff = data - kvm->arch.last_tsc_write; -#ifdef CONFIG_X86_64 - usdiff = (usdiff * 1000) / vcpu->arch.virtual_tsc_khz; -#else - /* do_div() only does unsigned */ - asm("idivl %2; xor %%edx, %%edx" - : "=A"(usdiff) - : "A"(usdiff * 1000), "rm"(vcpu->arch.virtual_tsc_khz)); -#endif - do_div(elapsed, 1000); - usdiff -= elapsed; - if (usdiff < 0) - usdiff = -usdiff; - - /* - * Special case: TSC write with a small delta (1 second) of virtual - * cycle time against real time is interpreted as an attempt to - * synchronize the CPU. - * - * For a reliable TSC, we can match TSC offsets, and for an unstable - * TSC, we add elapsed time in this computation. We could let the - * compensation code attempt to catch up if we fall behind, but - * it's better to try to match offsets from the beginning. - */ - if (usdiff < USEC_PER_SEC && - vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) { - if (!check_tsc_unstable()) { - offset = kvm->arch.cur_tsc_offset; - pr_debug("kvm: matched tsc offset for %llu\n", data); - } else { - u64 delta = nsec_to_cycles(vcpu, elapsed); - data += delta; - offset = kvm_x86_ops->compute_tsc_offset(vcpu, data); - pr_debug("kvm: adjusted tsc offset by %llu\n", delta); - } - } else { - /* - * We split periods of matched TSC writes into generations. - * For each generation, we track the original measured - * nanosecond time, offset, and write, so if TSCs are in - * sync, we can match exact offset, and if not, we can match - * exact software computaion in compute_guest_tsc() - * - * These values are tracked in kvm->arch.cur_xxx variables. - */ - kvm->arch.cur_tsc_generation++; - kvm->arch.cur_tsc_nsec = ns; - kvm->arch.cur_tsc_write = data; - kvm->arch.cur_tsc_offset = offset; - pr_debug("kvm: new tsc generation %u, clock %llu\n", - kvm->arch.cur_tsc_generation, data); - } - - /* - * We also track th most recent recorded KHZ, write and time to - * allow the matching interval to be extended at each write. - */ - kvm->arch.last_tsc_nsec = ns; - kvm->arch.last_tsc_write = data; - kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz; - - /* Reset of TSC must disable overshoot protection below */ - vcpu->arch.hv_clock.tsc_timestamp = 0; - vcpu->arch.last_guest_tsc = data; - - /* Keep track of which generation this VCPU has synchronized to */ - vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation; - vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec; - vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write; - - kvm_x86_ops->write_tsc_offset(vcpu, offset); - raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); -} - -EXPORT_SYMBOL_GPL(kvm_write_tsc); - -static int kvm_guest_time_update(struct kvm_vcpu *v) -{ - unsigned long flags; - struct kvm_vcpu_arch *vcpu = &v->arch; - void *shared_kaddr; - unsigned long this_tsc_khz; - s64 kernel_ns, max_kernel_ns; - u64 tsc_timestamp; - - /* Keep irq disabled to prevent changes to the clock */ - local_irq_save(flags); - tsc_timestamp = kvm_x86_ops->read_l1_tsc(v); - kernel_ns = get_kernel_ns(); - this_tsc_khz = __get_cpu_var(cpu_tsc_khz); - if (unlikely(this_tsc_khz == 0)) { - local_irq_restore(flags); - kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); - return 1; - } - - /* - * We may have to catch up the TSC to match elapsed wall clock - * time for two reasons, even if kvmclock is used. - * 1) CPU could have been running below the maximum TSC rate - * 2) Broken TSC compensation resets the base at each VCPU - * entry to avoid unknown leaps of TSC even when running - * again on the same CPU. This may cause apparent elapsed - * time to disappear, and the guest to stand still or run - * very slowly. - */ - if (vcpu->tsc_catchup) { - u64 tsc = compute_guest_tsc(v, kernel_ns); - if (tsc > tsc_timestamp) { - adjust_tsc_offset_guest(v, tsc - tsc_timestamp); - tsc_timestamp = tsc; - } - } - - local_irq_restore(flags); - - if (!vcpu->time_page) - return 0; - - /* - * Time as measured by the TSC may go backwards when resetting the base - * tsc_timestamp. The reason for this is that the TSC resolution is - * higher than the resolution of the other clock scales. Thus, many - * possible measurments of the TSC correspond to one measurement of any - * other clock, and so a spread of values is possible. This is not a - * problem for the computation of the nanosecond clock; with TSC rates - * around 1GHZ, there can only be a few cycles which correspond to one - * nanosecond value, and any path through this code will inevitably - * take longer than that. However, with the kernel_ns value itself, - * the precision may be much lower, down to HZ granularity. If the - * first sampling of TSC against kernel_ns ends in the low part of the - * range, and the second in the high end of the range, we can get: - * - * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new - * - * As the sampling errors potentially range in the thousands of cycles, - * it is possible such a time value has already been observed by the - * guest. To protect against this, we must compute the system time as - * observed by the guest and ensure the new system time is greater. - */ - max_kernel_ns = 0; - if (vcpu->hv_clock.tsc_timestamp) { - max_kernel_ns = vcpu->last_guest_tsc - - vcpu->hv_clock.tsc_timestamp; - max_kernel_ns = pvclock_scale_delta(max_kernel_ns, - vcpu->hv_clock.tsc_to_system_mul, - vcpu->hv_clock.tsc_shift); - max_kernel_ns += vcpu->last_kernel_ns; - } - - if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) { - kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz, - &vcpu->hv_clock.tsc_shift, - &vcpu->hv_clock.tsc_to_system_mul); - vcpu->hw_tsc_khz = this_tsc_khz; - } - - if (max_kernel_ns > kernel_ns) - kernel_ns = max_kernel_ns; - - /* With all the info we got, fill in the values */ - vcpu->hv_clock.tsc_timestamp = tsc_timestamp; - vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; - vcpu->last_kernel_ns = kernel_ns; - vcpu->last_guest_tsc = tsc_timestamp; - vcpu->hv_clock.flags = 0; - - /* - * The interface expects us to write an even number signaling that the - * update is finished. Since the guest won't see the intermediate - * state, we just increase by 2 at the end. - */ - vcpu->hv_clock.version += 2; - - shared_kaddr = kmap_atomic(vcpu->time_page); - - memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock, - sizeof(vcpu->hv_clock)); - - kunmap_atomic(shared_kaddr); - - mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT); - return 0; -} - -static bool msr_mtrr_valid(unsigned msr) -{ - switch (msr) { - case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1: - case MSR_MTRRfix64K_00000: - case MSR_MTRRfix16K_80000: - case MSR_MTRRfix16K_A0000: - case MSR_MTRRfix4K_C0000: - case MSR_MTRRfix4K_C8000: - case MSR_MTRRfix4K_D0000: - case MSR_MTRRfix4K_D8000: - case MSR_MTRRfix4K_E0000: - case MSR_MTRRfix4K_E8000: - case MSR_MTRRfix4K_F0000: - case MSR_MTRRfix4K_F8000: - case MSR_MTRRdefType: - case MSR_IA32_CR_PAT: - return true; - case 0x2f8: - return true; - } - return false; -} - -static bool valid_pat_type(unsigned t) -{ - return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */ -} - -static bool valid_mtrr_type(unsigned t) -{ - return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */ -} - -static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data) -{ - int i; - - if (!msr_mtrr_valid(msr)) - return false; - - if (msr == MSR_IA32_CR_PAT) { - for (i = 0; i < 8; i++) - if (!valid_pat_type((data >> (i * 8)) & 0xff)) - return false; - return true; - } else if (msr == MSR_MTRRdefType) { - if (data & ~0xcff) - return false; - return valid_mtrr_type(data & 0xff); - } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) { - for (i = 0; i < 8 ; i++) - if (!valid_mtrr_type((data >> (i * 8)) & 0xff)) - return false; - return true; - } - - /* variable MTRRs */ - return valid_mtrr_type(data & 0xff); -} - -static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data) -{ - u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges; - - if (!mtrr_valid(vcpu, msr, data)) - return 1; - - if (msr == MSR_MTRRdefType) { - vcpu->arch.mtrr_state.def_type = data; - vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10; - } else if (msr == MSR_MTRRfix64K_00000) - p[0] = data; - else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000) - p[1 + msr - MSR_MTRRfix16K_80000] = data; - else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000) - p[3 + msr - MSR_MTRRfix4K_C0000] = data; - else if (msr == MSR_IA32_CR_PAT) - vcpu->arch.pat = data; - else { /* Variable MTRRs */ - int idx, is_mtrr_mask; - u64 *pt; - - idx = (msr - 0x200) / 2; - is_mtrr_mask = msr - 0x200 - 2 * idx; - if (!is_mtrr_mask) - pt = - (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo; - else - pt = - (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo; - *pt = data; - } - - kvm_mmu_reset_context(vcpu); - return 0; -} - -static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data) -{ - u64 mcg_cap = vcpu->arch.mcg_cap; - unsigned bank_num = mcg_cap & 0xff; - - switch (msr) { - case MSR_IA32_MCG_STATUS: - vcpu->arch.mcg_status = data; - break; - case MSR_IA32_MCG_CTL: - if (!(mcg_cap & MCG_CTL_P)) - return 1; - if (data != 0 && data != ~(u64)0) - return -1; - vcpu->arch.mcg_ctl = data; - break; - default: - if (msr >= MSR_IA32_MC0_CTL && - msr < MSR_IA32_MC0_CTL + 4 * bank_num) { - u32 offset = msr - MSR_IA32_MC0_CTL; - /* only 0 or all 1s can be written to IA32_MCi_CTL - * some Linux kernels though clear bit 10 in bank 4 to - * workaround a BIOS/GART TBL issue on AMD K8s, ignore - * this to avoid an uncatched #GP in the guest - */ - if ((offset & 0x3) == 0 && - data != 0 && (data | (1 << 10)) != ~(u64)0) - return -1; - vcpu->arch.mce_banks[offset] = data; - break; - } - return 1; - } - return 0; -} - -static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) -{ - struct kvm *kvm = vcpu->kvm; - int lm = is_long_mode(vcpu); - u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64 - : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32; - u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 - : kvm->arch.xen_hvm_config.blob_size_32; - u32 page_num = data & ~PAGE_MASK; - u64 page_addr = data & PAGE_MASK; - u8 *page; - int r; - - r = -E2BIG; - if (page_num >= blob_size) - goto out; - r = -ENOMEM; - page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE); - if (IS_ERR(page)) { - r = PTR_ERR(page); - goto out; - } - if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE)) - goto out_free; - r = 0; -out_free: - kfree(page); -out: - return r; -} - -static bool kvm_hv_hypercall_enabled(struct kvm *kvm) -{ - return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE; -} - -static bool kvm_hv_msr_partition_wide(u32 msr) -{ - bool r = false; - switch (msr) { - case HV_X64_MSR_GUEST_OS_ID: - case HV_X64_MSR_HYPERCALL: - r = true; - break; - } - - return r; -} - -static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data) -{ - struct kvm *kvm = vcpu->kvm; - - switch (msr) { - case HV_X64_MSR_GUEST_OS_ID: - kvm->arch.hv_guest_os_id = data; - /* setting guest os id to zero disables hypercall page */ - if (!kvm->arch.hv_guest_os_id) - kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE; - break; - case HV_X64_MSR_HYPERCALL: { - u64 gfn; - unsigned long addr; - u8 instructions[4]; - - /* if guest os id is not set hypercall should remain disabled */ - if (!kvm->arch.hv_guest_os_id) - break; - if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) { - kvm->arch.hv_hypercall = data; - break; - } - gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT; - addr = gfn_to_hva(kvm, gfn); - if (kvm_is_error_hva(addr)) - return 1; - kvm_x86_ops->patch_hypercall(vcpu, instructions); - ((unsigned char *)instructions)[3] = 0xc3; /* ret */ - if (__copy_to_user((void __user *)addr, instructions, 4)) - return 1; - kvm->arch.hv_hypercall = data; - break; - } - default: - pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x " - "data 0x%llx\n", msr, data); - return 1; - } - return 0; -} - -static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data) -{ - switch (msr) { - case HV_X64_MSR_APIC_ASSIST_PAGE: { - unsigned long addr; - - if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) { - vcpu->arch.hv_vapic = data; - break; - } - addr = gfn_to_hva(vcpu->kvm, data >> - HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT); - if (kvm_is_error_hva(addr)) - return 1; - if (__clear_user((void __user *)addr, PAGE_SIZE)) - return 1; - vcpu->arch.hv_vapic = data; - break; - } - case HV_X64_MSR_EOI: - return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data); - case HV_X64_MSR_ICR: - return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data); - case HV_X64_MSR_TPR: - return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data); - default: - pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x " - "data 0x%llx\n", msr, data); - return 1; - } - - return 0; -} - -static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) -{ - gpa_t gpa = data & ~0x3f; - - /* Bits 2:5 are resrved, Should be zero */ - if (data & 0x3c) - return 1; - - vcpu->arch.apf.msr_val = data; - - if (!(data & KVM_ASYNC_PF_ENABLED)) { - kvm_clear_async_pf_completion_queue(vcpu); - kvm_async_pf_hash_reset(vcpu); - return 0; - } - - if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa)) - return 1; - - vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); - kvm_async_pf_wakeup_all(vcpu); - return 0; -} - -static void kvmclock_reset(struct kvm_vcpu *vcpu) -{ - if (vcpu->arch.time_page) { - kvm_release_page_dirty(vcpu->arch.time_page); - vcpu->arch.time_page = NULL; - } -} - -static void accumulate_steal_time(struct kvm_vcpu *vcpu) -{ - u64 delta; - - if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) - return; - - delta = current->sched_info.run_delay - vcpu->arch.st.last_steal; - vcpu->arch.st.last_steal = current->sched_info.run_delay; - vcpu->arch.st.accum_steal = delta; -} - -static void record_steal_time(struct kvm_vcpu *vcpu) -{ - if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) - return; - - if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, - &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)))) - return; - - vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal; - vcpu->arch.st.steal.version += 2; - vcpu->arch.st.accum_steal = 0; - - kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, - &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); -} - -int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) -{ - bool pr = false; - - switch (msr) { - case MSR_EFER: - return set_efer(vcpu, data); - case MSR_K7_HWCR: - data &= ~(u64)0x40; /* ignore flush filter disable */ - data &= ~(u64)0x100; /* ignore ignne emulation enable */ - data &= ~(u64)0x8; /* ignore TLB cache disable */ - if (data != 0) { - pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n", - data); - return 1; - } - break; - case MSR_FAM10H_MMIO_CONF_BASE: - if (data != 0) { - pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: " - "0x%llx\n", data); - return 1; - } - break; - case MSR_AMD64_NB_CFG: - break; - case MSR_IA32_DEBUGCTLMSR: - if (!data) { - /* We support the non-activated case already */ - break; - } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) { - /* Values other than LBR and BTF are vendor-specific, - thus reserved and should throw a #GP */ - return 1; - } - pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n", - __func__, data); - break; - case MSR_IA32_UCODE_REV: - case MSR_IA32_UCODE_WRITE: - case MSR_VM_HSAVE_PA: - case MSR_AMD64_PATCH_LOADER: - break; - case 0x200 ... 0x2ff: - return set_msr_mtrr(vcpu, msr, data); - case MSR_IA32_APICBASE: - kvm_set_apic_base(vcpu, data); - break; - case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: - return kvm_x2apic_msr_write(vcpu, msr, data); - case MSR_IA32_TSCDEADLINE: - kvm_set_lapic_tscdeadline_msr(vcpu, data); - break; - case MSR_IA32_MISC_ENABLE: - vcpu->arch.ia32_misc_enable_msr = data; - break; - case MSR_KVM_WALL_CLOCK_NEW: - case MSR_KVM_WALL_CLOCK: - vcpu->kvm->arch.wall_clock = data; - kvm_write_wall_clock(vcpu->kvm, data); - break; - case MSR_KVM_SYSTEM_TIME_NEW: - case MSR_KVM_SYSTEM_TIME: { - kvmclock_reset(vcpu); - - vcpu->arch.time = data; - kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); - - /* we verify if the enable bit is set... */ - if (!(data & 1)) - break; - - /* ...but clean it before doing the actual write */ - vcpu->arch.time_offset = data & ~(PAGE_MASK | 1); - - vcpu->arch.time_page = - gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT); - - if (is_error_page(vcpu->arch.time_page)) { - kvm_release_page_clean(vcpu->arch.time_page); - vcpu->arch.time_page = NULL; - } - break; - } - case MSR_KVM_ASYNC_PF_EN: - if (kvm_pv_enable_async_pf(vcpu, data)) - return 1; - break; - case MSR_KVM_STEAL_TIME: - - if (unlikely(!sched_info_on())) - return 1; - - if (data & KVM_STEAL_RESERVED_MASK) - return 1; - - if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime, - data & KVM_STEAL_VALID_BITS)) - return 1; - - vcpu->arch.st.msr_val = data; - - if (!(data & KVM_MSR_ENABLED)) - break; - - vcpu->arch.st.last_steal = current->sched_info.run_delay; - - preempt_disable(); - accumulate_steal_time(vcpu); - preempt_enable(); - - kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); - - break; - - case MSR_IA32_MCG_CTL: - case MSR_IA32_MCG_STATUS: - case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1: - return set_msr_mce(vcpu, msr, data); - - /* Performance counters are not protected by a CPUID bit, - * so we should check all of them in the generic path for the sake of - * cross vendor migration. - * Writing a zero into the event select MSRs disables them, - * which we perfectly emulate ;-). Any other value should be at least - * reported, some guests depend on them. - */ - case MSR_K7_EVNTSEL0: - case MSR_K7_EVNTSEL1: - case MSR_K7_EVNTSEL2: - case MSR_K7_EVNTSEL3: - if (data != 0) - pr_unimpl(vcpu, "unimplemented perfctr wrmsr: " - "0x%x data 0x%llx\n", msr, data); - break; - /* at least RHEL 4 unconditionally writes to the perfctr registers, - * so we ignore writes to make it happy. - */ - case MSR_K7_PERFCTR0: - case MSR_K7_PERFCTR1: - case MSR_K7_PERFCTR2: - case MSR_K7_PERFCTR3: - pr_unimpl(vcpu, "unimplemented perfctr wrmsr: " - "0x%x data 0x%llx\n", msr, data); - break; - case MSR_P6_PERFCTR0: - case MSR_P6_PERFCTR1: - pr = true; - case MSR_P6_EVNTSEL0: - case MSR_P6_EVNTSEL1: - if (kvm_pmu_msr(vcpu, msr)) - return kvm_pmu_set_msr(vcpu, msr, data); - - if (pr || data != 0) - pr_unimpl(vcpu, "disabled perfctr wrmsr: " - "0x%x data 0x%llx\n", msr, data); - break; - case MSR_K7_CLK_CTL: - /* - * Ignore all writes to this no longer documented MSR. - * Writes are only relevant for old K7 processors, - * all pre-dating SVM, but a recommended workaround from - * AMD for these chips. It is possible to speicify the - * affected processor models on the command line, hence - * the need to ignore the workaround. - */ - break; - case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: - if (kvm_hv_msr_partition_wide(msr)) { - int r; - mutex_lock(&vcpu->kvm->lock); - r = set_msr_hyperv_pw(vcpu, msr, data); - mutex_unlock(&vcpu->kvm->lock); - return r; - } else - return set_msr_hyperv(vcpu, msr, data); - break; - case MSR_IA32_BBL_CR_CTL3: - /* Drop writes to this legacy MSR -- see rdmsr - * counterpart for further detail. - */ - pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data); - break; - case MSR_AMD64_OSVW_ID_LENGTH: - if (!guest_cpuid_has_osvw(vcpu)) - return 1; - vcpu->arch.osvw.length = data; - break; - case MSR_AMD64_OSVW_STATUS: - if (!guest_cpuid_has_osvw(vcpu)) - return 1; - vcpu->arch.osvw.status = data; - break; - default: - if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr)) - return xen_hvm_config(vcpu, data); - if (kvm_pmu_msr(vcpu, msr)) - return kvm_pmu_set_msr(vcpu, msr, data); - if (!ignore_msrs) { - pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", - msr, data); - return 1; - } else { - pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", - msr, data); - break; - } - } - return 0; -} -EXPORT_SYMBOL_GPL(kvm_set_msr_common); - - -/* - * Reads an msr value (of 'msr_index') into 'pdata'. - * Returns 0 on success, non-0 otherwise. - * Assumes vcpu_load() was already called. - */ -int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) -{ - return kvm_x86_ops->get_msr(vcpu, msr_index, pdata); -} - -static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) -{ - u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges; - - if (!msr_mtrr_valid(msr)) - return 1; - - if (msr == MSR_MTRRdefType) - *pdata = vcpu->arch.mtrr_state.def_type + - (vcpu->arch.mtrr_state.enabled << 10); - else if (msr == MSR_MTRRfix64K_00000) - *pdata = p[0]; - else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000) - *pdata = p[1 + msr - MSR_MTRRfix16K_80000]; - else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000) - *pdata = p[3 + msr - MSR_MTRRfix4K_C0000]; - else if (msr == MSR_IA32_CR_PAT) - *pdata = vcpu->arch.pat; - else { /* Variable MTRRs */ - int idx, is_mtrr_mask; - u64 *pt; - - idx = (msr - 0x200) / 2; - is_mtrr_mask = msr - 0x200 - 2 * idx; - if (!is_mtrr_mask) - pt = - (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo; - else - pt = - (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo; - *pdata = *pt; - } - - return 0; -} - -static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) -{ - u64 data; - u64 mcg_cap = vcpu->arch.mcg_cap; - unsigned bank_num = mcg_cap & 0xff; - - switch (msr) { - case MSR_IA32_P5_MC_ADDR: - case MSR_IA32_P5_MC_TYPE: - data = 0; - break; - case MSR_IA32_MCG_CAP: - data = vcpu->arch.mcg_cap; - break; - case MSR_IA32_MCG_CTL: - if (!(mcg_cap & MCG_CTL_P)) - return 1; - data = vcpu->arch.mcg_ctl; - break; - case MSR_IA32_MCG_STATUS: - data = vcpu->arch.mcg_status; - break; - default: - if (msr >= MSR_IA32_MC0_CTL && - msr < MSR_IA32_MC0_CTL + 4 * bank_num) { - u32 offset = msr - MSR_IA32_MC0_CTL; - data = vcpu->arch.mce_banks[offset]; - break; - } - return 1; - } - *pdata = data; - return 0; -} - -static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) -{ - u64 data = 0; - struct kvm *kvm = vcpu->kvm; - - switch (msr) { - case HV_X64_MSR_GUEST_OS_ID: - data = kvm->arch.hv_guest_os_id; - break; - case HV_X64_MSR_HYPERCALL: - data = kvm->arch.hv_hypercall; - break; - default: - pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); - return 1; - } - - *pdata = data; - return 0; -} - -static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) -{ - u64 data = 0; - - switch (msr) { - case HV_X64_MSR_VP_INDEX: { - int r; - struct kvm_vcpu *v; - kvm_for_each_vcpu(r, v, vcpu->kvm) - if (v == vcpu) - data = r; - break; - } - case HV_X64_MSR_EOI: - return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata); - case HV_X64_MSR_ICR: - return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata); - case HV_X64_MSR_TPR: - return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata); - case HV_X64_MSR_APIC_ASSIST_PAGE: - data = vcpu->arch.hv_vapic; - break; - default: - pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); - return 1; - } - *pdata = data; - return 0; -} - -int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) -{ - u64 data; - - switch (msr) { - case MSR_IA32_PLATFORM_ID: - case MSR_IA32_EBL_CR_POWERON: - case MSR_IA32_DEBUGCTLMSR: - case MSR_IA32_LASTBRANCHFROMIP: - case MSR_IA32_LASTBRANCHTOIP: - case MSR_IA32_LASTINTFROMIP: - case MSR_IA32_LASTINTTOIP: - case MSR_K8_SYSCFG: - case MSR_K7_HWCR: - case MSR_VM_HSAVE_PA: - case MSR_K7_EVNTSEL0: - case MSR_K7_PERFCTR0: - case MSR_K8_INT_PENDING_MSG: - case MSR_AMD64_NB_CFG: - case MSR_FAM10H_MMIO_CONF_BASE: - data = 0; - break; - case MSR_P6_PERFCTR0: - case MSR_P6_PERFCTR1: - case MSR_P6_EVNTSEL0: - case MSR_P6_EVNTSEL1: - if (kvm_pmu_msr(vcpu, msr)) - return kvm_pmu_get_msr(vcpu, msr, pdata); - data = 0; - break; - case MSR_IA32_UCODE_REV: - data = 0x100000000ULL; - break; - case MSR_MTRRcap: - data = 0x500 | KVM_NR_VAR_MTRR; - break; - case 0x200 ... 0x2ff: - return get_msr_mtrr(vcpu, msr, pdata); - case 0xcd: /* fsb frequency */ - data = 3; - break; - /* - * MSR_EBC_FREQUENCY_ID - * Conservative value valid for even the basic CPU models. - * Models 0,1: 000 in bits 23:21 indicating a bus speed of - * 100MHz, model 2 000 in bits 18:16 indicating 100MHz, - * and 266MHz for model 3, or 4. Set Core Clock - * Frequency to System Bus Frequency Ratio to 1 (bits - * 31:24) even though these are only valid for CPU - * models > 2, however guests may end up dividing or - * multiplying by zero otherwise. - */ - case MSR_EBC_FREQUENCY_ID: - data = 1 << 24; - break; - case MSR_IA32_APICBASE: - data = kvm_get_apic_base(vcpu); - break; - case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: - return kvm_x2apic_msr_read(vcpu, msr, pdata); - break; - case MSR_IA32_TSCDEADLINE: - data = kvm_get_lapic_tscdeadline_msr(vcpu); - break; - case MSR_IA32_MISC_ENABLE: - data = vcpu->arch.ia32_misc_enable_msr; - break; - case MSR_IA32_PERF_STATUS: - /* TSC increment by tick */ - data = 1000ULL; - /* CPU multiplier */ - data |= (((uint64_t)4ULL) << 40); - break; - case MSR_EFER: - data = vcpu->arch.efer; - break; - case MSR_KVM_WALL_CLOCK: - case MSR_KVM_WALL_CLOCK_NEW: - data = vcpu->kvm->arch.wall_clock; - break; - case MSR_KVM_SYSTEM_TIME: - case MSR_KVM_SYSTEM_TIME_NEW: - data = vcpu->arch.time; - break; - case MSR_KVM_ASYNC_PF_EN: - data = vcpu->arch.apf.msr_val; - break; - case MSR_KVM_STEAL_TIME: - data = vcpu->arch.st.msr_val; - break; - case MSR_IA32_P5_MC_ADDR: - case MSR_IA32_P5_MC_TYPE: - case MSR_IA32_MCG_CAP: - case MSR_IA32_MCG_CTL: - case MSR_IA32_MCG_STATUS: - case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1: - return get_msr_mce(vcpu, msr, pdata); - case MSR_K7_CLK_CTL: - /* - * Provide expected ramp-up count for K7. All other - * are set to zero, indicating minimum divisors for - * every field. - * - * This prevents guest kernels on AMD host with CPU - * type 6, model 8 and higher from exploding due to - * the rdmsr failing. - */ - data = 0x20000000; - break; - case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: - if (kvm_hv_msr_partition_wide(msr)) { - int r; - mutex_lock(&vcpu->kvm->lock); - r = get_msr_hyperv_pw(vcpu, msr, pdata); - mutex_unlock(&vcpu->kvm->lock); - return r; - } else - return get_msr_hyperv(vcpu, msr, pdata); - break; - case MSR_IA32_BBL_CR_CTL3: - /* This legacy MSR exists but isn't fully documented in current - * silicon. It is however accessed by winxp in very narrow - * scenarios where it sets bit #19, itself documented as - * a "reserved" bit. Best effort attempt to source coherent - * read data here should the balance of the register be - * interpreted by the guest: - * - * L2 cache control register 3: 64GB range, 256KB size, - * enabled, latency 0x1, configured - */ - data = 0xbe702111; - break; - case MSR_AMD64_OSVW_ID_LENGTH: - if (!guest_cpuid_has_osvw(vcpu)) - return 1; - data = vcpu->arch.osvw.length; - break; - case MSR_AMD64_OSVW_STATUS: - if (!guest_cpuid_has_osvw(vcpu)) - return 1; - data = vcpu->arch.osvw.status; - break; - default: - if (kvm_pmu_msr(vcpu, msr)) - return kvm_pmu_get_msr(vcpu, msr, pdata); - if (!ignore_msrs) { - pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr); - return 1; - } else { - pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr); - data = 0; - } - break; - } - *pdata = data; - return 0; -} -EXPORT_SYMBOL_GPL(kvm_get_msr_common); - -/* - * Read or write a bunch of msrs. All parameters are kernel addresses. - * - * @return number of msrs set successfully. - */ -static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, - struct kvm_msr_entry *entries, - int (*do_msr)(struct kvm_vcpu *vcpu, - unsigned index, u64 *data)) -{ - int i, idx; - - idx = srcu_read_lock(&vcpu->kvm->srcu); - for (i = 0; i < msrs->nmsrs; ++i) - if (do_msr(vcpu, entries[i].index, &entries[i].data)) - break; - srcu_read_unlock(&vcpu->kvm->srcu, idx); - - return i; -} - -/* - * Read or write a bunch of msrs. Parameters are user addresses. - * - * @return number of msrs set successfully. - */ -static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, - int (*do_msr)(struct kvm_vcpu *vcpu, - unsigned index, u64 *data), - int writeback) -{ - struct kvm_msrs msrs; - struct kvm_msr_entry *entries; - int r, n; - unsigned size; - - r = -EFAULT; - if (copy_from_user(&msrs, user_msrs, sizeof msrs)) - goto out; - - r = -E2BIG; - if (msrs.nmsrs >= MAX_IO_MSRS) - goto out; - - size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; - entries = memdup_user(user_msrs->entries, size); - if (IS_ERR(entries)) { - r = PTR_ERR(entries); - goto out; - } - - r = n = __msr_io(vcpu, &msrs, entries, do_msr); - if (r < 0) - goto out_free; - - r = -EFAULT; - if (writeback && copy_to_user(user_msrs->entries, entries, size)) - goto out_free; - - r = n; - -out_free: - kfree(entries); -out: - return r; -} - -int kvm_dev_ioctl_check_extension(long ext) -{ - int r; - - switch (ext) { - case KVM_CAP_IRQCHIP: - case KVM_CAP_HLT: - case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: - case KVM_CAP_SET_TSS_ADDR: - case KVM_CAP_EXT_CPUID: - case KVM_CAP_CLOCKSOURCE: - case KVM_CAP_PIT: - case KVM_CAP_NOP_IO_DELAY: - case KVM_CAP_MP_STATE: - case KVM_CAP_SYNC_MMU: - case KVM_CAP_USER_NMI: - case KVM_CAP_REINJECT_CONTROL: - case KVM_CAP_IRQ_INJECT_STATUS: - case KVM_CAP_ASSIGN_DEV_IRQ: - case KVM_CAP_IRQFD: - case KVM_CAP_IOEVENTFD: - case KVM_CAP_PIT2: - case KVM_CAP_PIT_STATE2: - case KVM_CAP_SET_IDENTITY_MAP_ADDR: - case KVM_CAP_XEN_HVM: - case KVM_CAP_ADJUST_CLOCK: - case KVM_CAP_VCPU_EVENTS: - case KVM_CAP_HYPERV: - case KVM_CAP_HYPERV_VAPIC: - case KVM_CAP_HYPERV_SPIN: - case KVM_CAP_PCI_SEGMENT: - case KVM_CAP_DEBUGREGS: - case KVM_CAP_X86_ROBUST_SINGLESTEP: - case KVM_CAP_XSAVE: - case KVM_CAP_ASYNC_PF: - case KVM_CAP_GET_TSC_KHZ: - case KVM_CAP_PCI_2_3: - r = 1; - break; - case KVM_CAP_COALESCED_MMIO: - r = KVM_COALESCED_MMIO_PAGE_OFFSET; - break; - case KVM_CAP_VAPIC: - r = !kvm_x86_ops->cpu_has_accelerated_tpr(); - break; - case KVM_CAP_NR_VCPUS: - r = KVM_SOFT_MAX_VCPUS; - break; - case KVM_CAP_MAX_VCPUS: - r = KVM_MAX_VCPUS; - break; - case KVM_CAP_NR_MEMSLOTS: - r = KVM_MEMORY_SLOTS; - break; - case KVM_CAP_PV_MMU: /* obsolete */ - r = 0; - break; - case KVM_CAP_IOMMU: - r = iommu_present(&pci_bus_type); - break; - case KVM_CAP_MCE: - r = KVM_MAX_MCE_BANKS; - break; - case KVM_CAP_XCRS: - r = cpu_has_xsave; - break; - case KVM_CAP_TSC_CONTROL: - r = kvm_has_tsc_control; - break; - case KVM_CAP_TSC_DEADLINE_TIMER: - r = boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER); - break; - default: - r = 0; - break; - } - return r; - -} - -long kvm_arch_dev_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - long r; - - switch (ioctl) { - case KVM_GET_MSR_INDEX_LIST: { - struct kvm_msr_list __user *user_msr_list = argp; - struct kvm_msr_list msr_list; - unsigned n; - - r = -EFAULT; - if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) - goto out; - n = msr_list.nmsrs; - msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs); - if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) - goto out; - r = -E2BIG; - if (n < msr_list.nmsrs) - goto out; - r = -EFAULT; - if (copy_to_user(user_msr_list->indices, &msrs_to_save, - num_msrs_to_save * sizeof(u32))) - goto out; - if (copy_to_user(user_msr_list->indices + num_msrs_to_save, - &emulated_msrs, - ARRAY_SIZE(emulated_msrs) * sizeof(u32))) - goto out; - r = 0; - break; - } - case KVM_GET_SUPPORTED_CPUID: { - struct kvm_cpuid2 __user *cpuid_arg = argp; - struct kvm_cpuid2 cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_dev_ioctl_get_supported_cpuid(&cpuid, - cpuid_arg->entries); - if (r) - goto out; - - r = -EFAULT; - if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) - goto out; - r = 0; - break; - } - case KVM_X86_GET_MCE_CAP_SUPPORTED: { - u64 mce_cap; - - mce_cap = KVM_MCE_CAP_SUPPORTED; - r = -EFAULT; - if (copy_to_user(argp, &mce_cap, sizeof mce_cap)) - goto out; - r = 0; - break; - } - default: - r = -EINVAL; - } -out: - return r; -} - -static void wbinvd_ipi(void *garbage) -{ - wbinvd(); -} - -static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu) -{ - return vcpu->kvm->arch.iommu_domain && - !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY); -} - -void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) -{ - /* Address WBINVD may be executed by guest */ - if (need_emulate_wbinvd(vcpu)) { - if (kvm_x86_ops->has_wbinvd_exit()) - cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); - else if (vcpu->cpu != -1 && vcpu->cpu != cpu) - smp_call_function_single(vcpu->cpu, - wbinvd_ipi, NULL, 1); - } - - kvm_x86_ops->vcpu_load(vcpu, cpu); - - /* Apply any externally detected TSC adjustments (due to suspend) */ - if (unlikely(vcpu->arch.tsc_offset_adjustment)) { - adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment); - vcpu->arch.tsc_offset_adjustment = 0; - set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests); - } - - if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) { - s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 : - native_read_tsc() - vcpu->arch.last_host_tsc; - if (tsc_delta < 0) - mark_tsc_unstable("KVM discovered backwards TSC"); - if (check_tsc_unstable()) { - u64 offset = kvm_x86_ops->compute_tsc_offset(vcpu, - vcpu->arch.last_guest_tsc); - kvm_x86_ops->write_tsc_offset(vcpu, offset); - vcpu->arch.tsc_catchup = 1; - } - kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); - if (vcpu->cpu != cpu) - kvm_migrate_timers(vcpu); - vcpu->cpu = cpu; - } - - accumulate_steal_time(vcpu); - kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); -} - -void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) -{ - kvm_x86_ops->vcpu_put(vcpu); - kvm_put_guest_fpu(vcpu); - vcpu->arch.last_host_tsc = native_read_tsc(); -} - -static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, - struct kvm_lapic_state *s) -{ - memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s); - - return 0; -} - -static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, - struct kvm_lapic_state *s) -{ - memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s); - kvm_apic_post_state_restore(vcpu); - update_cr8_intercept(vcpu); - - return 0; -} - -static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, - struct kvm_interrupt *irq) -{ - if (irq->irq < 0 || irq->irq >= 256) - return -EINVAL; - if (irqchip_in_kernel(vcpu->kvm)) - return -ENXIO; - - kvm_queue_interrupt(vcpu, irq->irq, false); - kvm_make_request(KVM_REQ_EVENT, vcpu); - - return 0; -} - -static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) -{ - kvm_inject_nmi(vcpu); - - return 0; -} - -static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, - struct kvm_tpr_access_ctl *tac) -{ - if (tac->flags) - return -EINVAL; - vcpu->arch.tpr_access_reporting = !!tac->enabled; - return 0; -} - -static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, - u64 mcg_cap) -{ - int r; - unsigned bank_num = mcg_cap & 0xff, bank; - - r = -EINVAL; - if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS) - goto out; - if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000)) - goto out; - r = 0; - vcpu->arch.mcg_cap = mcg_cap; - /* Init IA32_MCG_CTL to all 1s */ - if (mcg_cap & MCG_CTL_P) - vcpu->arch.mcg_ctl = ~(u64)0; - /* Init IA32_MCi_CTL to all 1s */ - for (bank = 0; bank < bank_num; bank++) - vcpu->arch.mce_banks[bank*4] = ~(u64)0; -out: - return r; -} - -static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, - struct kvm_x86_mce *mce) -{ - u64 mcg_cap = vcpu->arch.mcg_cap; - unsigned bank_num = mcg_cap & 0xff; - u64 *banks = vcpu->arch.mce_banks; - - if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL)) - return -EINVAL; - /* - * if IA32_MCG_CTL is not all 1s, the uncorrected error - * reporting is disabled - */ - if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) && - vcpu->arch.mcg_ctl != ~(u64)0) - return 0; - banks += 4 * mce->bank; - /* - * if IA32_MCi_CTL is not all 1s, the uncorrected error - * reporting is disabled for the bank - */ - if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0) - return 0; - if (mce->status & MCI_STATUS_UC) { - if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) || - !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) { - kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); - return 0; - } - if (banks[1] & MCI_STATUS_VAL) - mce->status |= MCI_STATUS_OVER; - banks[2] = mce->addr; - banks[3] = mce->misc; - vcpu->arch.mcg_status = mce->mcg_status; - banks[1] = mce->status; - kvm_queue_exception(vcpu, MC_VECTOR); - } else if (!(banks[1] & MCI_STATUS_VAL) - || !(banks[1] & MCI_STATUS_UC)) { - if (banks[1] & MCI_STATUS_VAL) - mce->status |= MCI_STATUS_OVER; - banks[2] = mce->addr; - banks[3] = mce->misc; - banks[1] = mce->status; - } else - banks[1] |= MCI_STATUS_OVER; - return 0; -} - -static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, - struct kvm_vcpu_events *events) -{ - process_nmi(vcpu); - events->exception.injected = - vcpu->arch.exception.pending && - !kvm_exception_is_soft(vcpu->arch.exception.nr); - events->exception.nr = vcpu->arch.exception.nr; - events->exception.has_error_code = vcpu->arch.exception.has_error_code; - events->exception.pad = 0; - events->exception.error_code = vcpu->arch.exception.error_code; - - events->interrupt.injected = - vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft; - events->interrupt.nr = vcpu->arch.interrupt.nr; - events->interrupt.soft = 0; - events->interrupt.shadow = - kvm_x86_ops->get_interrupt_shadow(vcpu, - KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI); - - events->nmi.injected = vcpu->arch.nmi_injected; - events->nmi.pending = vcpu->arch.nmi_pending != 0; - events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu); - events->nmi.pad = 0; - - events->sipi_vector = vcpu->arch.sipi_vector; - - events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING - | KVM_VCPUEVENT_VALID_SIPI_VECTOR - | KVM_VCPUEVENT_VALID_SHADOW); - memset(&events->reserved, 0, sizeof(events->reserved)); -} - -static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, - struct kvm_vcpu_events *events) -{ - if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING - | KVM_VCPUEVENT_VALID_SIPI_VECTOR - | KVM_VCPUEVENT_VALID_SHADOW)) - return -EINVAL; - - process_nmi(vcpu); - vcpu->arch.exception.pending = events->exception.injected; - vcpu->arch.exception.nr = events->exception.nr; - vcpu->arch.exception.has_error_code = events->exception.has_error_code; - vcpu->arch.exception.error_code = events->exception.error_code; - - vcpu->arch.interrupt.pending = events->interrupt.injected; - vcpu->arch.interrupt.nr = events->interrupt.nr; - vcpu->arch.interrupt.soft = events->interrupt.soft; - if (events->flags & KVM_VCPUEVENT_VALID_SHADOW) - kvm_x86_ops->set_interrupt_shadow(vcpu, - events->interrupt.shadow); - - vcpu->arch.nmi_injected = events->nmi.injected; - if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING) - vcpu->arch.nmi_pending = events->nmi.pending; - kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked); - - if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR) - vcpu->arch.sipi_vector = events->sipi_vector; - - kvm_make_request(KVM_REQ_EVENT, vcpu); - - return 0; -} - -static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu, - struct kvm_debugregs *dbgregs) -{ - memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db)); - dbgregs->dr6 = vcpu->arch.dr6; - dbgregs->dr7 = vcpu->arch.dr7; - dbgregs->flags = 0; - memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved)); -} - -static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu, - struct kvm_debugregs *dbgregs) -{ - if (dbgregs->flags) - return -EINVAL; - - memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db)); - vcpu->arch.dr6 = dbgregs->dr6; - vcpu->arch.dr7 = dbgregs->dr7; - - return 0; -} - -static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, - struct kvm_xsave *guest_xsave) -{ - if (cpu_has_xsave) - memcpy(guest_xsave->region, - &vcpu->arch.guest_fpu.state->xsave, - xstate_size); - else { - memcpy(guest_xsave->region, - &vcpu->arch.guest_fpu.state->fxsave, - sizeof(struct i387_fxsave_struct)); - *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] = - XSTATE_FPSSE; - } -} - -static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu, - struct kvm_xsave *guest_xsave) -{ - u64 xstate_bv = - *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)]; - - if (cpu_has_xsave) - memcpy(&vcpu->arch.guest_fpu.state->xsave, - guest_xsave->region, xstate_size); - else { - if (xstate_bv & ~XSTATE_FPSSE) - return -EINVAL; - memcpy(&vcpu->arch.guest_fpu.state->fxsave, - guest_xsave->region, sizeof(struct i387_fxsave_struct)); - } - return 0; -} - -static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu, - struct kvm_xcrs *guest_xcrs) -{ - if (!cpu_has_xsave) { - guest_xcrs->nr_xcrs = 0; - return; - } - - guest_xcrs->nr_xcrs = 1; - guest_xcrs->flags = 0; - guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK; - guest_xcrs->xcrs[0].value = vcpu->arch.xcr0; -} - -static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu, - struct kvm_xcrs *guest_xcrs) -{ - int i, r = 0; - - if (!cpu_has_xsave) - return -EINVAL; - - if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags) - return -EINVAL; - - for (i = 0; i < guest_xcrs->nr_xcrs; i++) - /* Only support XCR0 currently */ - if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) { - r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK, - guest_xcrs->xcrs[0].value); - break; - } - if (r) - r = -EINVAL; - return r; -} - -long kvm_arch_vcpu_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) -{ - struct kvm_vcpu *vcpu = filp->private_data; - void __user *argp = (void __user *)arg; - int r; - union { - struct kvm_lapic_state *lapic; - struct kvm_xsave *xsave; - struct kvm_xcrs *xcrs; - void *buffer; - } u; - - u.buffer = NULL; - switch (ioctl) { - case KVM_GET_LAPIC: { - r = -EINVAL; - if (!vcpu->arch.apic) - goto out; - u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL); - - r = -ENOMEM; - if (!u.lapic) - goto out; - r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state))) - goto out; - r = 0; - break; - } - case KVM_SET_LAPIC: { - r = -EINVAL; - if (!vcpu->arch.apic) - goto out; - u.lapic = memdup_user(argp, sizeof(*u.lapic)); - if (IS_ERR(u.lapic)) { - r = PTR_ERR(u.lapic); - goto out; - } - - r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic); - if (r) - goto out; - r = 0; - break; - } - case KVM_INTERRUPT: { - struct kvm_interrupt irq; - - r = -EFAULT; - if (copy_from_user(&irq, argp, sizeof irq)) - goto out; - r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); - if (r) - goto out; - r = 0; - break; - } - case KVM_NMI: { - r = kvm_vcpu_ioctl_nmi(vcpu); - if (r) - goto out; - r = 0; - break; - } - case KVM_SET_CPUID: { - struct kvm_cpuid __user *cpuid_arg = argp; - struct kvm_cpuid cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); - if (r) - goto out; - break; - } - case KVM_SET_CPUID2: { - struct kvm_cpuid2 __user *cpuid_arg = argp; - struct kvm_cpuid2 cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid, - cpuid_arg->entries); - if (r) - goto out; - break; - } - case KVM_GET_CPUID2: { - struct kvm_cpuid2 __user *cpuid_arg = argp; - struct kvm_cpuid2 cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, - cpuid_arg->entries); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) - goto out; - r = 0; - break; - } - case KVM_GET_MSRS: - r = msr_io(vcpu, argp, kvm_get_msr, 1); - break; - case KVM_SET_MSRS: - r = msr_io(vcpu, argp, do_set_msr, 0); - break; - case KVM_TPR_ACCESS_REPORTING: { - struct kvm_tpr_access_ctl tac; - - r = -EFAULT; - if (copy_from_user(&tac, argp, sizeof tac)) - goto out; - r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(argp, &tac, sizeof tac)) - goto out; - r = 0; - break; - }; - case KVM_SET_VAPIC_ADDR: { - struct kvm_vapic_addr va; - - r = -EINVAL; - if (!irqchip_in_kernel(vcpu->kvm)) - goto out; - r = -EFAULT; - if (copy_from_user(&va, argp, sizeof va)) - goto out; - r = 0; - kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr); - break; - } - case KVM_X86_SETUP_MCE: { - u64 mcg_cap; - - r = -EFAULT; - if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap)) - goto out; - r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap); - break; - } - case KVM_X86_SET_MCE: { - struct kvm_x86_mce mce; - - r = -EFAULT; - if (copy_from_user(&mce, argp, sizeof mce)) - goto out; - r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce); - break; - } - case KVM_GET_VCPU_EVENTS: { - struct kvm_vcpu_events events; - - kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events); - - r = -EFAULT; - if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events))) - break; - r = 0; - break; - } - case KVM_SET_VCPU_EVENTS: { - struct kvm_vcpu_events events; - - r = -EFAULT; - if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events))) - break; - - r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events); - break; - } - case KVM_GET_DEBUGREGS: { - struct kvm_debugregs dbgregs; - - kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs); - - r = -EFAULT; - if (copy_to_user(argp, &dbgregs, - sizeof(struct kvm_debugregs))) - break; - r = 0; - break; - } - case KVM_SET_DEBUGREGS: { - struct kvm_debugregs dbgregs; - - r = -EFAULT; - if (copy_from_user(&dbgregs, argp, - sizeof(struct kvm_debugregs))) - break; - - r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs); - break; - } - case KVM_GET_XSAVE: { - u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL); - r = -ENOMEM; - if (!u.xsave) - break; - - kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave); - - r = -EFAULT; - if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave))) - break; - r = 0; - break; - } - case KVM_SET_XSAVE: { - u.xsave = memdup_user(argp, sizeof(*u.xsave)); - if (IS_ERR(u.xsave)) { - r = PTR_ERR(u.xsave); - goto out; - } - - r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave); - break; - } - case KVM_GET_XCRS: { - u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL); - r = -ENOMEM; - if (!u.xcrs) - break; - - kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs); - - r = -EFAULT; - if (copy_to_user(argp, u.xcrs, - sizeof(struct kvm_xcrs))) - break; - r = 0; - break; - } - case KVM_SET_XCRS: { - u.xcrs = memdup_user(argp, sizeof(*u.xcrs)); - if (IS_ERR(u.xcrs)) { - r = PTR_ERR(u.xcrs); - goto out; - } - - r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs); - break; - } - case KVM_SET_TSC_KHZ: { - u32 user_tsc_khz; - - r = -EINVAL; - user_tsc_khz = (u32)arg; - - if (user_tsc_khz >= kvm_max_guest_tsc_khz) - goto out; - - if (user_tsc_khz == 0) - user_tsc_khz = tsc_khz; - - kvm_set_tsc_khz(vcpu, user_tsc_khz); - - r = 0; - goto out; - } - case KVM_GET_TSC_KHZ: { - r = vcpu->arch.virtual_tsc_khz; - goto out; - } - default: - r = -EINVAL; - } -out: - kfree(u.buffer); - return r; -} - -int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) -{ - return VM_FAULT_SIGBUS; -} - -static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) -{ - int ret; - - if (addr > (unsigned int)(-3 * PAGE_SIZE)) - return -1; - ret = kvm_x86_ops->set_tss_addr(kvm, addr); - return ret; -} - -static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm, - u64 ident_addr) -{ - kvm->arch.ept_identity_map_addr = ident_addr; - return 0; -} - -static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, - u32 kvm_nr_mmu_pages) -{ - if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) - return -EINVAL; - - mutex_lock(&kvm->slots_lock); - spin_lock(&kvm->mmu_lock); - - kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); - kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; - - spin_unlock(&kvm->mmu_lock); - mutex_unlock(&kvm->slots_lock); - return 0; -} - -static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) -{ - return kvm->arch.n_max_mmu_pages; -} - -static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) -{ - int r; - - r = 0; - switch (chip->chip_id) { - case KVM_IRQCHIP_PIC_MASTER: - memcpy(&chip->chip.pic, - &pic_irqchip(kvm)->pics[0], - sizeof(struct kvm_pic_state)); - break; - case KVM_IRQCHIP_PIC_SLAVE: - memcpy(&chip->chip.pic, - &pic_irqchip(kvm)->pics[1], - sizeof(struct kvm_pic_state)); - break; - case KVM_IRQCHIP_IOAPIC: - r = kvm_get_ioapic(kvm, &chip->chip.ioapic); - break; - default: - r = -EINVAL; - break; - } - return r; -} - -static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) -{ - int r; - - r = 0; - switch (chip->chip_id) { - case KVM_IRQCHIP_PIC_MASTER: - spin_lock(&pic_irqchip(kvm)->lock); - memcpy(&pic_irqchip(kvm)->pics[0], - &chip->chip.pic, - sizeof(struct kvm_pic_state)); - spin_unlock(&pic_irqchip(kvm)->lock); - break; - case KVM_IRQCHIP_PIC_SLAVE: - spin_lock(&pic_irqchip(kvm)->lock); - memcpy(&pic_irqchip(kvm)->pics[1], - &chip->chip.pic, - sizeof(struct kvm_pic_state)); - spin_unlock(&pic_irqchip(kvm)->lock); - break; - case KVM_IRQCHIP_IOAPIC: - r = kvm_set_ioapic(kvm, &chip->chip.ioapic); - break; - default: - r = -EINVAL; - break; - } - kvm_pic_update_irq(pic_irqchip(kvm)); - return r; -} - -static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps) -{ - int r = 0; - - mutex_lock(&kvm->arch.vpit->pit_state.lock); - memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state)); - mutex_unlock(&kvm->arch.vpit->pit_state.lock); - return r; -} - -static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps) -{ - int r = 0; - - mutex_lock(&kvm->arch.vpit->pit_state.lock); - memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state)); - kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0); - mutex_unlock(&kvm->arch.vpit->pit_state.lock); - return r; -} - -static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) -{ - int r = 0; - - mutex_lock(&kvm->arch.vpit->pit_state.lock); - memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels, - sizeof(ps->channels)); - ps->flags = kvm->arch.vpit->pit_state.flags; - mutex_unlock(&kvm->arch.vpit->pit_state.lock); - memset(&ps->reserved, 0, sizeof(ps->reserved)); - return r; -} - -static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) -{ - int r = 0, start = 0; - u32 prev_legacy, cur_legacy; - mutex_lock(&kvm->arch.vpit->pit_state.lock); - prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; - cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; - if (!prev_legacy && cur_legacy) - start = 1; - memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels, - sizeof(kvm->arch.vpit->pit_state.channels)); - kvm->arch.vpit->pit_state.flags = ps->flags; - kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start); - mutex_unlock(&kvm->arch.vpit->pit_state.lock); - return r; -} - -static int kvm_vm_ioctl_reinject(struct kvm *kvm, - struct kvm_reinject_control *control) -{ - if (!kvm->arch.vpit) - return -ENXIO; - mutex_lock(&kvm->arch.vpit->pit_state.lock); - kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject; - mutex_unlock(&kvm->arch.vpit->pit_state.lock); - return 0; -} - -/** - * write_protect_slot - write protect a slot for dirty logging - * @kvm: the kvm instance - * @memslot: the slot we protect - * @dirty_bitmap: the bitmap indicating which pages are dirty - * @nr_dirty_pages: the number of dirty pages - * - * We have two ways to find all sptes to protect: - * 1. Use kvm_mmu_slot_remove_write_access() which walks all shadow pages and - * checks ones that have a spte mapping a page in the slot. - * 2. Use kvm_mmu_rmap_write_protect() for each gfn found in the bitmap. - * - * Generally speaking, if there are not so many dirty pages compared to the - * number of shadow pages, we should use the latter. - * - * Note that letting others write into a page marked dirty in the old bitmap - * by using the remaining tlb entry is not a problem. That page will become - * write protected again when we flush the tlb and then be reported dirty to - * the user space by copying the old bitmap. - */ -static void write_protect_slot(struct kvm *kvm, - struct kvm_memory_slot *memslot, - unsigned long *dirty_bitmap, - unsigned long nr_dirty_pages) -{ - spin_lock(&kvm->mmu_lock); - - /* Not many dirty pages compared to # of shadow pages. */ - if (nr_dirty_pages < kvm->arch.n_used_mmu_pages) { - unsigned long gfn_offset; - - for_each_set_bit(gfn_offset, dirty_bitmap, memslot->npages) { - unsigned long gfn = memslot->base_gfn + gfn_offset; - - kvm_mmu_rmap_write_protect(kvm, gfn, memslot); - } - kvm_flush_remote_tlbs(kvm); - } else - kvm_mmu_slot_remove_write_access(kvm, memslot->id); - - spin_unlock(&kvm->mmu_lock); -} - -/* - * Get (and clear) the dirty memory log for a memory slot. - */ -int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, - struct kvm_dirty_log *log) -{ - int r; - struct kvm_memory_slot *memslot; - unsigned long n, nr_dirty_pages; - - mutex_lock(&kvm->slots_lock); - - r = -EINVAL; - if (log->slot >= KVM_MEMORY_SLOTS) - goto out; - - memslot = id_to_memslot(kvm->memslots, log->slot); - r = -ENOENT; - if (!memslot->dirty_bitmap) - goto out; - - n = kvm_dirty_bitmap_bytes(memslot); - nr_dirty_pages = memslot->nr_dirty_pages; - - /* If nothing is dirty, don't bother messing with page tables. */ - if (nr_dirty_pages) { - struct kvm_memslots *slots, *old_slots; - unsigned long *dirty_bitmap, *dirty_bitmap_head; - - dirty_bitmap = memslot->dirty_bitmap; - dirty_bitmap_head = memslot->dirty_bitmap_head; - if (dirty_bitmap == dirty_bitmap_head) - dirty_bitmap_head += n / sizeof(long); - memset(dirty_bitmap_head, 0, n); - - r = -ENOMEM; - slots = kmemdup(kvm->memslots, sizeof(*kvm->memslots), GFP_KERNEL); - if (!slots) - goto out; - - memslot = id_to_memslot(slots, log->slot); - memslot->nr_dirty_pages = 0; - memslot->dirty_bitmap = dirty_bitmap_head; - update_memslots(slots, NULL); - - old_slots = kvm->memslots; - rcu_assign_pointer(kvm->memslots, slots); - synchronize_srcu_expedited(&kvm->srcu); - kfree(old_slots); - - write_protect_slot(kvm, memslot, dirty_bitmap, nr_dirty_pages); - - r = -EFAULT; - if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n)) - goto out; - } else { - r = -EFAULT; - if (clear_user(log->dirty_bitmap, n)) - goto out; - } - - r = 0; -out: - mutex_unlock(&kvm->slots_lock); - return r; -} - -long kvm_arch_vm_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) -{ - struct kvm *kvm = filp->private_data; - void __user *argp = (void __user *)arg; - int r = -ENOTTY; - /* - * This union makes it completely explicit to gcc-3.x - * that these two variables' stack usage should be - * combined, not added together. - */ - union { - struct kvm_pit_state ps; - struct kvm_pit_state2 ps2; - struct kvm_pit_config pit_config; - } u; - - switch (ioctl) { - case KVM_SET_TSS_ADDR: - r = kvm_vm_ioctl_set_tss_addr(kvm, arg); - if (r < 0) - goto out; - break; - case KVM_SET_IDENTITY_MAP_ADDR: { - u64 ident_addr; - - r = -EFAULT; - if (copy_from_user(&ident_addr, argp, sizeof ident_addr)) - goto out; - r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr); - if (r < 0) - goto out; - break; - } - case KVM_SET_NR_MMU_PAGES: - r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); - if (r) - goto out; - break; - case KVM_GET_NR_MMU_PAGES: - r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); - break; - case KVM_CREATE_IRQCHIP: { - struct kvm_pic *vpic; - - mutex_lock(&kvm->lock); - r = -EEXIST; - if (kvm->arch.vpic) - goto create_irqchip_unlock; - r = -EINVAL; - if (atomic_read(&kvm->online_vcpus)) - goto create_irqchip_unlock; - r = -ENOMEM; - vpic = kvm_create_pic(kvm); - if (vpic) { - r = kvm_ioapic_init(kvm); - if (r) { - mutex_lock(&kvm->slots_lock); - kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, - &vpic->dev_master); - kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, - &vpic->dev_slave); - kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, - &vpic->dev_eclr); - mutex_unlock(&kvm->slots_lock); - kfree(vpic); - goto create_irqchip_unlock; - } - } else - goto create_irqchip_unlock; - smp_wmb(); - kvm->arch.vpic = vpic; - smp_wmb(); - r = kvm_setup_default_irq_routing(kvm); - if (r) { - mutex_lock(&kvm->slots_lock); - mutex_lock(&kvm->irq_lock); - kvm_ioapic_destroy(kvm); - kvm_destroy_pic(kvm); - mutex_unlock(&kvm->irq_lock); - mutex_unlock(&kvm->slots_lock); - } - create_irqchip_unlock: - mutex_unlock(&kvm->lock); - break; - } - case KVM_CREATE_PIT: - u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY; - goto create_pit; - case KVM_CREATE_PIT2: - r = -EFAULT; - if (copy_from_user(&u.pit_config, argp, - sizeof(struct kvm_pit_config))) - goto out; - create_pit: - mutex_lock(&kvm->slots_lock); - r = -EEXIST; - if (kvm->arch.vpit) - goto create_pit_unlock; - r = -ENOMEM; - kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags); - if (kvm->arch.vpit) - r = 0; - create_pit_unlock: - mutex_unlock(&kvm->slots_lock); - break; - case KVM_IRQ_LINE_STATUS: - case KVM_IRQ_LINE: { - struct kvm_irq_level irq_event; - - r = -EFAULT; - if (copy_from_user(&irq_event, argp, sizeof irq_event)) - goto out; - r = -ENXIO; - if (irqchip_in_kernel(kvm)) { - __s32 status; - status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, - irq_event.irq, irq_event.level); - if (ioctl == KVM_IRQ_LINE_STATUS) { - r = -EFAULT; - irq_event.status = status; - if (copy_to_user(argp, &irq_event, - sizeof irq_event)) - goto out; - } - r = 0; - } - break; - } - case KVM_GET_IRQCHIP: { - /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ - struct kvm_irqchip *chip; - - chip = memdup_user(argp, sizeof(*chip)); - if (IS_ERR(chip)) { - r = PTR_ERR(chip); - goto out; - } - - r = -ENXIO; - if (!irqchip_in_kernel(kvm)) - goto get_irqchip_out; - r = kvm_vm_ioctl_get_irqchip(kvm, chip); - if (r) - goto get_irqchip_out; - r = -EFAULT; - if (copy_to_user(argp, chip, sizeof *chip)) - goto get_irqchip_out; - r = 0; - get_irqchip_out: - kfree(chip); - if (r) - goto out; - break; - } - case KVM_SET_IRQCHIP: { - /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ - struct kvm_irqchip *chip; - - chip = memdup_user(argp, sizeof(*chip)); - if (IS_ERR(chip)) { - r = PTR_ERR(chip); - goto out; - } - - r = -ENXIO; - if (!irqchip_in_kernel(kvm)) - goto set_irqchip_out; - r = kvm_vm_ioctl_set_irqchip(kvm, chip); - if (r) - goto set_irqchip_out; - r = 0; - set_irqchip_out: - kfree(chip); - if (r) - goto out; - break; - } - case KVM_GET_PIT: { - r = -EFAULT; - if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state))) - goto out; - r = -ENXIO; - if (!kvm->arch.vpit) - goto out; - r = kvm_vm_ioctl_get_pit(kvm, &u.ps); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state))) - goto out; - r = 0; - break; - } - case KVM_SET_PIT: { - r = -EFAULT; - if (copy_from_user(&u.ps, argp, sizeof u.ps)) - goto out; - r = -ENXIO; - if (!kvm->arch.vpit) - goto out; - r = kvm_vm_ioctl_set_pit(kvm, &u.ps); - if (r) - goto out; - r = 0; - break; - } - case KVM_GET_PIT2: { - r = -ENXIO; - if (!kvm->arch.vpit) - goto out; - r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(argp, &u.ps2, sizeof(u.ps2))) - goto out; - r = 0; - break; - } - case KVM_SET_PIT2: { - r = -EFAULT; - if (copy_from_user(&u.ps2, argp, sizeof(u.ps2))) - goto out; - r = -ENXIO; - if (!kvm->arch.vpit) - goto out; - r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2); - if (r) - goto out; - r = 0; - break; - } - case KVM_REINJECT_CONTROL: { - struct kvm_reinject_control control; - r = -EFAULT; - if (copy_from_user(&control, argp, sizeof(control))) - goto out; - r = kvm_vm_ioctl_reinject(kvm, &control); - if (r) - goto out; - r = 0; - break; - } - case KVM_XEN_HVM_CONFIG: { - r = -EFAULT; - if (copy_from_user(&kvm->arch.xen_hvm_config, argp, - sizeof(struct kvm_xen_hvm_config))) - goto out; - r = -EINVAL; - if (kvm->arch.xen_hvm_config.flags) - goto out; - r = 0; - break; - } - case KVM_SET_CLOCK: { - struct kvm_clock_data user_ns; - u64 now_ns; - s64 delta; - - r = -EFAULT; - if (copy_from_user(&user_ns, argp, sizeof(user_ns))) - goto out; - - r = -EINVAL; - if (user_ns.flags) - goto out; - - r = 0; - local_irq_disable(); - now_ns = get_kernel_ns(); - delta = user_ns.clock - now_ns; - local_irq_enable(); - kvm->arch.kvmclock_offset = delta; - break; - } - case KVM_GET_CLOCK: { - struct kvm_clock_data user_ns; - u64 now_ns; - - local_irq_disable(); - now_ns = get_kernel_ns(); - user_ns.clock = kvm->arch.kvmclock_offset + now_ns; - local_irq_enable(); - user_ns.flags = 0; - memset(&user_ns.pad, 0, sizeof(user_ns.pad)); - - r = -EFAULT; - if (copy_to_user(argp, &user_ns, sizeof(user_ns))) - goto out; - r = 0; - break; - } - - default: - ; - } -out: - return r; -} - -static void kvm_init_msr_list(void) -{ - u32 dummy[2]; - unsigned i, j; - - /* skip the first msrs in the list. KVM-specific */ - for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) { - if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) - continue; - if (j < i) - msrs_to_save[j] = msrs_to_save[i]; - j++; - } - num_msrs_to_save = j; -} - -static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len, - const void *v) -{ - int handled = 0; - int n; - - do { - n = min(len, 8); - if (!(vcpu->arch.apic && - !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v)) - && kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v)) - break; - handled += n; - addr += n; - len -= n; - v += n; - } while (len); - - return handled; -} - -static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) -{ - int handled = 0; - int n; - - do { - n = min(len, 8); - if (!(vcpu->arch.apic && - !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v)) - && kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v)) - break; - trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v); - handled += n; - addr += n; - len -= n; - v += n; - } while (len); - - return handled; -} - -static void kvm_set_segment(struct kvm_vcpu *vcpu, - struct kvm_segment *var, int seg) -{ - kvm_x86_ops->set_segment(vcpu, var, seg); -} - -void kvm_get_segment(struct kvm_vcpu *vcpu, - struct kvm_segment *var, int seg) -{ - kvm_x86_ops->get_segment(vcpu, var, seg); -} - -gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access) -{ - gpa_t t_gpa; - struct x86_exception exception; - - BUG_ON(!mmu_is_nested(vcpu)); - - /* NPT walks are always user-walks */ - access |= PFERR_USER_MASK; - t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &exception); - - return t_gpa; -} - -gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, - struct x86_exception *exception) -{ - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; - return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); -} - - gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, - struct x86_exception *exception) -{ - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; - access |= PFERR_FETCH_MASK; - return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); -} - -gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, - struct x86_exception *exception) -{ - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; - access |= PFERR_WRITE_MASK; - return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); -} - -/* uses this to access any guest's mapped memory without checking CPL */ -gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, - struct x86_exception *exception) -{ - return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception); -} - -static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, - struct kvm_vcpu *vcpu, u32 access, - struct x86_exception *exception) -{ - void *data = val; - int r = X86EMUL_CONTINUE; - - while (bytes) { - gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access, - exception); - unsigned offset = addr & (PAGE_SIZE-1); - unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset); - int ret; - - if (gpa == UNMAPPED_GVA) - return X86EMUL_PROPAGATE_FAULT; - ret = kvm_read_guest(vcpu->kvm, gpa, data, toread); - if (ret < 0) { - r = X86EMUL_IO_NEEDED; - goto out; - } - - bytes -= toread; - data += toread; - addr += toread; - } -out: - return r; -} - -/* used for instruction fetching */ -static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt, - gva_t addr, void *val, unsigned int bytes, - struct x86_exception *exception) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; - - return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, - access | PFERR_FETCH_MASK, - exception); -} - -int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt, - gva_t addr, void *val, unsigned int bytes, - struct x86_exception *exception) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; - - return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, - exception); -} -EXPORT_SYMBOL_GPL(kvm_read_guest_virt); - -static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt, - gva_t addr, void *val, unsigned int bytes, - struct x86_exception *exception) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception); -} - -int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt, - gva_t addr, void *val, - unsigned int bytes, - struct x86_exception *exception) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - void *data = val; - int r = X86EMUL_CONTINUE; - - while (bytes) { - gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, - PFERR_WRITE_MASK, - exception); - unsigned offset = addr & (PAGE_SIZE-1); - unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset); - int ret; - - if (gpa == UNMAPPED_GVA) - return X86EMUL_PROPAGATE_FAULT; - ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite); - if (ret < 0) { - r = X86EMUL_IO_NEEDED; - goto out; - } - - bytes -= towrite; - data += towrite; - addr += towrite; - } -out: - return r; -} -EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); - -static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, - gpa_t *gpa, struct x86_exception *exception, - bool write) -{ - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; - - if (vcpu_match_mmio_gva(vcpu, gva) && - check_write_user_access(vcpu, write, access, - vcpu->arch.access)) { - *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT | - (gva & (PAGE_SIZE - 1)); - trace_vcpu_match_mmio(gva, *gpa, write, false); - return 1; - } - - if (write) - access |= PFERR_WRITE_MASK; - - *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); - - if (*gpa == UNMAPPED_GVA) - return -1; - - /* For APIC access vmexit */ - if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) - return 1; - - if (vcpu_match_mmio_gpa(vcpu, *gpa)) { - trace_vcpu_match_mmio(gva, *gpa, write, true); - return 1; - } - - return 0; -} - -int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, - const void *val, int bytes) -{ - int ret; - - ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes); - if (ret < 0) - return 0; - kvm_mmu_pte_write(vcpu, gpa, val, bytes); - return 1; -} - -struct read_write_emulator_ops { - int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val, - int bytes); - int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa, - void *val, int bytes); - int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, - int bytes, void *val); - int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa, - void *val, int bytes); - bool write; -}; - -static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes) -{ - if (vcpu->mmio_read_completed) { - memcpy(val, vcpu->mmio_data, bytes); - trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, - vcpu->mmio_phys_addr, *(u64 *)val); - vcpu->mmio_read_completed = 0; - return 1; - } - - return 0; -} - -static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, - void *val, int bytes) -{ - return !kvm_read_guest(vcpu->kvm, gpa, val, bytes); -} - -static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa, - void *val, int bytes) -{ - return emulator_write_phys(vcpu, gpa, val, bytes); -} - -static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val) -{ - trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val); - return vcpu_mmio_write(vcpu, gpa, bytes, val); -} - -static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, - void *val, int bytes) -{ - trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0); - return X86EMUL_IO_NEEDED; -} - -static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, - void *val, int bytes) -{ - memcpy(vcpu->mmio_data, val, bytes); - memcpy(vcpu->run->mmio.data, vcpu->mmio_data, 8); - return X86EMUL_CONTINUE; -} - -static struct read_write_emulator_ops read_emultor = { - .read_write_prepare = read_prepare, - .read_write_emulate = read_emulate, - .read_write_mmio = vcpu_mmio_read, - .read_write_exit_mmio = read_exit_mmio, -}; - -static struct read_write_emulator_ops write_emultor = { - .read_write_emulate = write_emulate, - .read_write_mmio = write_mmio, - .read_write_exit_mmio = write_exit_mmio, - .write = true, -}; - -static int emulator_read_write_onepage(unsigned long addr, void *val, - unsigned int bytes, - struct x86_exception *exception, - struct kvm_vcpu *vcpu, - struct read_write_emulator_ops *ops) -{ - gpa_t gpa; - int handled, ret; - bool write = ops->write; - - if (ops->read_write_prepare && - ops->read_write_prepare(vcpu, val, bytes)) - return X86EMUL_CONTINUE; - - ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write); - - if (ret < 0) - return X86EMUL_PROPAGATE_FAULT; - - /* For APIC access vmexit */ - if (ret) - goto mmio; - - if (ops->read_write_emulate(vcpu, gpa, val, bytes)) - return X86EMUL_CONTINUE; - -mmio: - /* - * Is this MMIO handled locally? - */ - handled = ops->read_write_mmio(vcpu, gpa, bytes, val); - if (handled == bytes) - return X86EMUL_CONTINUE; - - gpa += handled; - bytes -= handled; - val += handled; - - vcpu->mmio_needed = 1; - vcpu->run->exit_reason = KVM_EXIT_MMIO; - vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa; - vcpu->mmio_size = bytes; - vcpu->run->mmio.len = min(vcpu->mmio_size, 8); - vcpu->run->mmio.is_write = vcpu->mmio_is_write = write; - vcpu->mmio_index = 0; - - return ops->read_write_exit_mmio(vcpu, gpa, val, bytes); -} - -int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr, - void *val, unsigned int bytes, - struct x86_exception *exception, - struct read_write_emulator_ops *ops) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - - /* Crossing a page boundary? */ - if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { - int rc, now; - - now = -addr & ~PAGE_MASK; - rc = emulator_read_write_onepage(addr, val, now, exception, - vcpu, ops); - - if (rc != X86EMUL_CONTINUE) - return rc; - addr += now; - val += now; - bytes -= now; - } - - return emulator_read_write_onepage(addr, val, bytes, exception, - vcpu, ops); -} - -static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, - unsigned long addr, - void *val, - unsigned int bytes, - struct x86_exception *exception) -{ - return emulator_read_write(ctxt, addr, val, bytes, - exception, &read_emultor); -} - -int emulator_write_emulated(struct x86_emulate_ctxt *ctxt, - unsigned long addr, - const void *val, - unsigned int bytes, - struct x86_exception *exception) -{ - return emulator_read_write(ctxt, addr, (void *)val, bytes, - exception, &write_emultor); -} - -#define CMPXCHG_TYPE(t, ptr, old, new) \ - (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old)) - -#ifdef CONFIG_X86_64 -# define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new) -#else -# define CMPXCHG64(ptr, old, new) \ - (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old)) -#endif - -static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, - unsigned long addr, - const void *old, - const void *new, - unsigned int bytes, - struct x86_exception *exception) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - gpa_t gpa; - struct page *page; - char *kaddr; - bool exchanged; - - /* guests cmpxchg8b have to be emulated atomically */ - if (bytes > 8 || (bytes & (bytes - 1))) - goto emul_write; - - gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL); - - if (gpa == UNMAPPED_GVA || - (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) - goto emul_write; - - if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK)) - goto emul_write; - - page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); - if (is_error_page(page)) { - kvm_release_page_clean(page); - goto emul_write; - } - - kaddr = kmap_atomic(page); - kaddr += offset_in_page(gpa); - switch (bytes) { - case 1: - exchanged = CMPXCHG_TYPE(u8, kaddr, old, new); - break; - case 2: - exchanged = CMPXCHG_TYPE(u16, kaddr, old, new); - break; - case 4: - exchanged = CMPXCHG_TYPE(u32, kaddr, old, new); - break; - case 8: - exchanged = CMPXCHG64(kaddr, old, new); - break; - default: - BUG(); - } - kunmap_atomic(kaddr); - kvm_release_page_dirty(page); - - if (!exchanged) - return X86EMUL_CMPXCHG_FAILED; - - kvm_mmu_pte_write(vcpu, gpa, new, bytes); - - return X86EMUL_CONTINUE; - -emul_write: - printk_once(KERN_WARNING "kvm: emulating exchange as write\n"); - - return emulator_write_emulated(ctxt, addr, new, bytes, exception); -} - -static int kernel_pio(struct kvm_vcpu *vcpu, void *pd) -{ - /* TODO: String I/O for in kernel device */ - int r; - - if (vcpu->arch.pio.in) - r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port, - vcpu->arch.pio.size, pd); - else - r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS, - vcpu->arch.pio.port, vcpu->arch.pio.size, - pd); - return r; -} - -static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, - unsigned short port, void *val, - unsigned int count, bool in) -{ - trace_kvm_pio(!in, port, size, count); - - vcpu->arch.pio.port = port; - vcpu->arch.pio.in = in; - vcpu->arch.pio.count = count; - vcpu->arch.pio.size = size; - - if (!kernel_pio(vcpu, vcpu->arch.pio_data)) { - vcpu->arch.pio.count = 0; - return 1; - } - - vcpu->run->exit_reason = KVM_EXIT_IO; - vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; - vcpu->run->io.size = size; - vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; - vcpu->run->io.count = count; - vcpu->run->io.port = port; - - return 0; -} - -static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt, - int size, unsigned short port, void *val, - unsigned int count) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - int ret; - - if (vcpu->arch.pio.count) - goto data_avail; - - ret = emulator_pio_in_out(vcpu, size, port, val, count, true); - if (ret) { -data_avail: - memcpy(val, vcpu->arch.pio_data, size * count); - vcpu->arch.pio.count = 0; - return 1; - } - - return 0; -} - -static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt, - int size, unsigned short port, - const void *val, unsigned int count) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - - memcpy(vcpu->arch.pio_data, val, size * count); - return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false); -} - -static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) -{ - return kvm_x86_ops->get_segment_base(vcpu, seg); -} - -static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address) -{ - kvm_mmu_invlpg(emul_to_vcpu(ctxt), address); -} - -int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu) -{ - if (!need_emulate_wbinvd(vcpu)) - return X86EMUL_CONTINUE; - - if (kvm_x86_ops->has_wbinvd_exit()) { - int cpu = get_cpu(); - - cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); - smp_call_function_many(vcpu->arch.wbinvd_dirty_mask, - wbinvd_ipi, NULL, 1); - put_cpu(); - cpumask_clear(vcpu->arch.wbinvd_dirty_mask); - } else - wbinvd(); - return X86EMUL_CONTINUE; -} -EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd); - -static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt) -{ - kvm_emulate_wbinvd(emul_to_vcpu(ctxt)); -} - -int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest) -{ - return _kvm_get_dr(emul_to_vcpu(ctxt), dr, dest); -} - -int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value) -{ - - return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value); -} - -static u64 mk_cr_64(u64 curr_cr, u32 new_val) -{ - return (curr_cr & ~((1ULL << 32) - 1)) | new_val; -} - -static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - unsigned long value; - - switch (cr) { - case 0: - value = kvm_read_cr0(vcpu); - break; - case 2: - value = vcpu->arch.cr2; - break; - case 3: - value = kvm_read_cr3(vcpu); - break; - case 4: - value = kvm_read_cr4(vcpu); - break; - case 8: - value = kvm_get_cr8(vcpu); - break; - default: - vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr); - return 0; - } - - return value; -} - -static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - int res = 0; - - switch (cr) { - case 0: - res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val)); - break; - case 2: - vcpu->arch.cr2 = val; - break; - case 3: - res = kvm_set_cr3(vcpu, val); - break; - case 4: - res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val)); - break; - case 8: - res = kvm_set_cr8(vcpu, val); - break; - default: - vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr); - res = -1; - } - - return res; -} - -static void emulator_set_rflags(struct x86_emulate_ctxt *ctxt, ulong val) -{ - kvm_set_rflags(emul_to_vcpu(ctxt), val); -} - -static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt) -{ - return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt)); -} - -static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) -{ - kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt); -} - -static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) -{ - kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt); -} - -static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) -{ - kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt); -} - -static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt) -{ - kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt); -} - -static unsigned long emulator_get_cached_segment_base( - struct x86_emulate_ctxt *ctxt, int seg) -{ - return get_segment_base(emul_to_vcpu(ctxt), seg); -} - -static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector, - struct desc_struct *desc, u32 *base3, - int seg) -{ - struct kvm_segment var; - - kvm_get_segment(emul_to_vcpu(ctxt), &var, seg); - *selector = var.selector; - - if (var.unusable) - return false; - - if (var.g) - var.limit >>= 12; - set_desc_limit(desc, var.limit); - set_desc_base(desc, (unsigned long)var.base); -#ifdef CONFIG_X86_64 - if (base3) - *base3 = var.base >> 32; -#endif - desc->type = var.type; - desc->s = var.s; - desc->dpl = var.dpl; - desc->p = var.present; - desc->avl = var.avl; - desc->l = var.l; - desc->d = var.db; - desc->g = var.g; - - return true; -} - -static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector, - struct desc_struct *desc, u32 base3, - int seg) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - struct kvm_segment var; - - var.selector = selector; - var.base = get_desc_base(desc); -#ifdef CONFIG_X86_64 - var.base |= ((u64)base3) << 32; -#endif - var.limit = get_desc_limit(desc); - if (desc->g) - var.limit = (var.limit << 12) | 0xfff; - var.type = desc->type; - var.present = desc->p; - var.dpl = desc->dpl; - var.db = desc->d; - var.s = desc->s; - var.l = desc->l; - var.g = desc->g; - var.avl = desc->avl; - var.present = desc->p; - var.unusable = !var.present; - var.padding = 0; - - kvm_set_segment(vcpu, &var, seg); - return; -} - -static int emulator_get_msr(struct x86_emulate_ctxt *ctxt, - u32 msr_index, u64 *pdata) -{ - return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata); -} - -static int emulator_set_msr(struct x86_emulate_ctxt *ctxt, - u32 msr_index, u64 data) -{ - return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data); -} - -static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt, - u32 pmc, u64 *pdata) -{ - return kvm_pmu_read_pmc(emul_to_vcpu(ctxt), pmc, pdata); -} - -static void emulator_halt(struct x86_emulate_ctxt *ctxt) -{ - emul_to_vcpu(ctxt)->arch.halt_request = 1; -} - -static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt) -{ - preempt_disable(); - kvm_load_guest_fpu(emul_to_vcpu(ctxt)); - /* - * CR0.TS may reference the host fpu state, not the guest fpu state, - * so it may be clear at this point. - */ - clts(); -} - -static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt) -{ - preempt_enable(); -} - -static int emulator_intercept(struct x86_emulate_ctxt *ctxt, - struct x86_instruction_info *info, - enum x86_intercept_stage stage) -{ - return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage); -} - -static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt, - u32 *eax, u32 *ebx, u32 *ecx, u32 *edx) -{ - struct kvm_cpuid_entry2 *cpuid = NULL; - - if (eax && ecx) - cpuid = kvm_find_cpuid_entry(emul_to_vcpu(ctxt), - *eax, *ecx); - - if (cpuid) { - *eax = cpuid->eax; - *ecx = cpuid->ecx; - if (ebx) - *ebx = cpuid->ebx; - if (edx) - *edx = cpuid->edx; - return true; - } - - return false; -} - -static struct x86_emulate_ops emulate_ops = { - .read_std = kvm_read_guest_virt_system, - .write_std = kvm_write_guest_virt_system, - .fetch = kvm_fetch_guest_virt, - .read_emulated = emulator_read_emulated, - .write_emulated = emulator_write_emulated, - .cmpxchg_emulated = emulator_cmpxchg_emulated, - .invlpg = emulator_invlpg, - .pio_in_emulated = emulator_pio_in_emulated, - .pio_out_emulated = emulator_pio_out_emulated, - .get_segment = emulator_get_segment, - .set_segment = emulator_set_segment, - .get_cached_segment_base = emulator_get_cached_segment_base, - .get_gdt = emulator_get_gdt, - .get_idt = emulator_get_idt, - .set_gdt = emulator_set_gdt, - .set_idt = emulator_set_idt, - .get_cr = emulator_get_cr, - .set_cr = emulator_set_cr, - .set_rflags = emulator_set_rflags, - .cpl = emulator_get_cpl, - .get_dr = emulator_get_dr, - .set_dr = emulator_set_dr, - .set_msr = emulator_set_msr, - .get_msr = emulator_get_msr, - .read_pmc = emulator_read_pmc, - .halt = emulator_halt, - .wbinvd = emulator_wbinvd, - .fix_hypercall = emulator_fix_hypercall, - .get_fpu = emulator_get_fpu, - .put_fpu = emulator_put_fpu, - .intercept = emulator_intercept, - .get_cpuid = emulator_get_cpuid, -}; - -static void cache_all_regs(struct kvm_vcpu *vcpu) -{ - kvm_register_read(vcpu, VCPU_REGS_RAX); - kvm_register_read(vcpu, VCPU_REGS_RSP); - kvm_register_read(vcpu, VCPU_REGS_RIP); - vcpu->arch.regs_dirty = ~0; -} - -static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask) -{ - u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask); - /* - * an sti; sti; sequence only disable interrupts for the first - * instruction. So, if the last instruction, be it emulated or - * not, left the system with the INT_STI flag enabled, it - * means that the last instruction is an sti. We should not - * leave the flag on in this case. The same goes for mov ss - */ - if (!(int_shadow & mask)) - kvm_x86_ops->set_interrupt_shadow(vcpu, mask); -} - -static void inject_emulated_exception(struct kvm_vcpu *vcpu) -{ - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - if (ctxt->exception.vector == PF_VECTOR) - kvm_propagate_fault(vcpu, &ctxt->exception); - else if (ctxt->exception.error_code_valid) - kvm_queue_exception_e(vcpu, ctxt->exception.vector, - ctxt->exception.error_code); - else - kvm_queue_exception(vcpu, ctxt->exception.vector); -} - -static void init_decode_cache(struct x86_emulate_ctxt *ctxt, - const unsigned long *regs) -{ - memset(&ctxt->twobyte, 0, - (void *)&ctxt->regs - (void *)&ctxt->twobyte); - memcpy(ctxt->regs, regs, sizeof(ctxt->regs)); - - ctxt->fetch.start = 0; - ctxt->fetch.end = 0; - ctxt->io_read.pos = 0; - ctxt->io_read.end = 0; - ctxt->mem_read.pos = 0; - ctxt->mem_read.end = 0; -} - -static void init_emulate_ctxt(struct kvm_vcpu *vcpu) -{ - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - int cs_db, cs_l; - - /* - * TODO: fix emulate.c to use guest_read/write_register - * instead of direct ->regs accesses, can save hundred cycles - * on Intel for instructions that don't read/change RSP, for - * for example. - */ - cache_all_regs(vcpu); - - kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); - - ctxt->eflags = kvm_get_rflags(vcpu); - ctxt->eip = kvm_rip_read(vcpu); - ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL : - (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 : - cs_l ? X86EMUL_MODE_PROT64 : - cs_db ? X86EMUL_MODE_PROT32 : - X86EMUL_MODE_PROT16; - ctxt->guest_mode = is_guest_mode(vcpu); - - init_decode_cache(ctxt, vcpu->arch.regs); - vcpu->arch.emulate_regs_need_sync_from_vcpu = false; -} - -int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip) -{ - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - int ret; - - init_emulate_ctxt(vcpu); - - ctxt->op_bytes = 2; - ctxt->ad_bytes = 2; - ctxt->_eip = ctxt->eip + inc_eip; - ret = emulate_int_real(ctxt, irq); - - if (ret != X86EMUL_CONTINUE) - return EMULATE_FAIL; - - ctxt->eip = ctxt->_eip; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); - kvm_rip_write(vcpu, ctxt->eip); - kvm_set_rflags(vcpu, ctxt->eflags); - - if (irq == NMI_VECTOR) - vcpu->arch.nmi_pending = 0; - else - vcpu->arch.interrupt.pending = false; - - return EMULATE_DONE; -} -EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt); - -static int handle_emulation_failure(struct kvm_vcpu *vcpu) -{ - int r = EMULATE_DONE; - - ++vcpu->stat.insn_emulation_fail; - trace_kvm_emulate_insn_failed(vcpu); - if (!is_guest_mode(vcpu)) { - vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; - vcpu->run->internal.ndata = 0; - r = EMULATE_FAIL; - } - kvm_queue_exception(vcpu, UD_VECTOR); - - return r; -} - -static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) -{ - gpa_t gpa; - - if (tdp_enabled) - return false; - - /* - * if emulation was due to access to shadowed page table - * and it failed try to unshadow page and re-entetr the - * guest to let CPU execute the instruction. - */ - if (kvm_mmu_unprotect_page_virt(vcpu, gva)) - return true; - - gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL); - - if (gpa == UNMAPPED_GVA) - return true; /* let cpu generate fault */ - - if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT))) - return true; - - return false; -} - -static bool retry_instruction(struct x86_emulate_ctxt *ctxt, - unsigned long cr2, int emulation_type) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - unsigned long last_retry_eip, last_retry_addr, gpa = cr2; - - last_retry_eip = vcpu->arch.last_retry_eip; - last_retry_addr = vcpu->arch.last_retry_addr; - - /* - * If the emulation is caused by #PF and it is non-page_table - * writing instruction, it means the VM-EXIT is caused by shadow - * page protected, we can zap the shadow page and retry this - * instruction directly. - * - * Note: if the guest uses a non-page-table modifying instruction - * on the PDE that points to the instruction, then we will unmap - * the instruction and go to an infinite loop. So, we cache the - * last retried eip and the last fault address, if we meet the eip - * and the address again, we can break out of the potential infinite - * loop. - */ - vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0; - - if (!(emulation_type & EMULTYPE_RETRY)) - return false; - - if (x86_page_table_writing_insn(ctxt)) - return false; - - if (ctxt->eip == last_retry_eip && last_retry_addr == cr2) - return false; - - vcpu->arch.last_retry_eip = ctxt->eip; - vcpu->arch.last_retry_addr = cr2; - - if (!vcpu->arch.mmu.direct_map) - gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); - - kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); - - return true; -} - -int x86_emulate_instruction(struct kvm_vcpu *vcpu, - unsigned long cr2, - int emulation_type, - void *insn, - int insn_len) -{ - int r; - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - bool writeback = true; - - kvm_clear_exception_queue(vcpu); - - if (!(emulation_type & EMULTYPE_NO_DECODE)) { - init_emulate_ctxt(vcpu); - ctxt->interruptibility = 0; - ctxt->have_exception = false; - ctxt->perm_ok = false; - - ctxt->only_vendor_specific_insn - = emulation_type & EMULTYPE_TRAP_UD; - - r = x86_decode_insn(ctxt, insn, insn_len); - - trace_kvm_emulate_insn_start(vcpu); - ++vcpu->stat.insn_emulation; - if (r != EMULATION_OK) { - if (emulation_type & EMULTYPE_TRAP_UD) - return EMULATE_FAIL; - if (reexecute_instruction(vcpu, cr2)) - return EMULATE_DONE; - if (emulation_type & EMULTYPE_SKIP) - return EMULATE_FAIL; - return handle_emulation_failure(vcpu); - } - } - - if (emulation_type & EMULTYPE_SKIP) { - kvm_rip_write(vcpu, ctxt->_eip); - return EMULATE_DONE; - } - - if (retry_instruction(ctxt, cr2, emulation_type)) - return EMULATE_DONE; - - /* this is needed for vmware backdoor interface to work since it - changes registers values during IO operation */ - if (vcpu->arch.emulate_regs_need_sync_from_vcpu) { - vcpu->arch.emulate_regs_need_sync_from_vcpu = false; - memcpy(ctxt->regs, vcpu->arch.regs, sizeof ctxt->regs); - } - -restart: - r = x86_emulate_insn(ctxt); - - if (r == EMULATION_INTERCEPTED) - return EMULATE_DONE; - - if (r == EMULATION_FAILED) { - if (reexecute_instruction(vcpu, cr2)) - return EMULATE_DONE; - - return handle_emulation_failure(vcpu); - } - - if (ctxt->have_exception) { - inject_emulated_exception(vcpu); - r = EMULATE_DONE; - } else if (vcpu->arch.pio.count) { - if (!vcpu->arch.pio.in) - vcpu->arch.pio.count = 0; - else - writeback = false; - r = EMULATE_DO_MMIO; - } else if (vcpu->mmio_needed) { - if (!vcpu->mmio_is_write) - writeback = false; - r = EMULATE_DO_MMIO; - } else if (r == EMULATION_RESTART) - goto restart; - else - r = EMULATE_DONE; - - if (writeback) { - toggle_interruptibility(vcpu, ctxt->interruptibility); - kvm_set_rflags(vcpu, ctxt->eflags); - kvm_make_request(KVM_REQ_EVENT, vcpu); - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); - vcpu->arch.emulate_regs_need_sync_to_vcpu = false; - kvm_rip_write(vcpu, ctxt->eip); - } else - vcpu->arch.emulate_regs_need_sync_to_vcpu = true; - - return r; -} -EXPORT_SYMBOL_GPL(x86_emulate_instruction); - -int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port) -{ - unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX); - int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt, - size, port, &val, 1); - /* do not return to emulator after return from userspace */ - vcpu->arch.pio.count = 0; - return ret; -} -EXPORT_SYMBOL_GPL(kvm_fast_pio_out); - -static void tsc_bad(void *info) -{ - __this_cpu_write(cpu_tsc_khz, 0); -} - -static void tsc_khz_changed(void *data) -{ - struct cpufreq_freqs *freq = data; - unsigned long khz = 0; - - if (data) - khz = freq->new; - else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) - khz = cpufreq_quick_get(raw_smp_processor_id()); - if (!khz) - khz = tsc_khz; - __this_cpu_write(cpu_tsc_khz, khz); -} - -static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val, - void *data) -{ - struct cpufreq_freqs *freq = data; - struct kvm *kvm; - struct kvm_vcpu *vcpu; - int i, send_ipi = 0; - - /* - * We allow guests to temporarily run on slowing clocks, - * provided we notify them after, or to run on accelerating - * clocks, provided we notify them before. Thus time never - * goes backwards. - * - * However, we have a problem. We can't atomically update - * the frequency of a given CPU from this function; it is - * merely a notifier, which can be called from any CPU. - * Changing the TSC frequency at arbitrary points in time - * requires a recomputation of local variables related to - * the TSC for each VCPU. We must flag these local variables - * to be updated and be sure the update takes place with the - * new frequency before any guests proceed. - * - * Unfortunately, the combination of hotplug CPU and frequency - * change creates an intractable locking scenario; the order - * of when these callouts happen is undefined with respect to - * CPU hotplug, and they can race with each other. As such, - * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is - * undefined; you can actually have a CPU frequency change take - * place in between the computation of X and the setting of the - * variable. To protect against this problem, all updates of - * the per_cpu tsc_khz variable are done in an interrupt - * protected IPI, and all callers wishing to update the value - * must wait for a synchronous IPI to complete (which is trivial - * if the caller is on the CPU already). This establishes the - * necessary total order on variable updates. - * - * Note that because a guest time update may take place - * anytime after the setting of the VCPU's request bit, the - * correct TSC value must be set before the request. However, - * to ensure the update actually makes it to any guest which - * starts running in hardware virtualization between the set - * and the acquisition of the spinlock, we must also ping the - * CPU after setting the request bit. - * - */ - - if (val == CPUFREQ_PRECHANGE && freq->old > freq->new) - return 0; - if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new) - return 0; - - smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1); - - raw_spin_lock(&kvm_lock); - list_for_each_entry(kvm, &vm_list, vm_list) { - kvm_for_each_vcpu(i, vcpu, kvm) { - if (vcpu->cpu != freq->cpu) - continue; - kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); - if (vcpu->cpu != smp_processor_id()) - send_ipi = 1; - } - } - raw_spin_unlock(&kvm_lock); - - if (freq->old < freq->new && send_ipi) { - /* - * We upscale the frequency. Must make the guest - * doesn't see old kvmclock values while running with - * the new frequency, otherwise we risk the guest sees - * time go backwards. - * - * In case we update the frequency for another cpu - * (which might be in guest context) send an interrupt - * to kick the cpu out of guest context. Next time - * guest context is entered kvmclock will be updated, - * so the guest will not see stale values. - */ - smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1); - } - return 0; -} - -static struct notifier_block kvmclock_cpufreq_notifier_block = { - .notifier_call = kvmclock_cpufreq_notifier -}; - -static int kvmclock_cpu_notifier(struct notifier_block *nfb, - unsigned long action, void *hcpu) -{ - unsigned int cpu = (unsigned long)hcpu; - - switch (action) { - case CPU_ONLINE: - case CPU_DOWN_FAILED: - smp_call_function_single(cpu, tsc_khz_changed, NULL, 1); - break; - case CPU_DOWN_PREPARE: - smp_call_function_single(cpu, tsc_bad, NULL, 1); - break; - } - return NOTIFY_OK; -} - -static struct notifier_block kvmclock_cpu_notifier_block = { - .notifier_call = kvmclock_cpu_notifier, - .priority = -INT_MAX -}; - -static void kvm_timer_init(void) -{ - int cpu; - - max_tsc_khz = tsc_khz; - register_hotcpu_notifier(&kvmclock_cpu_notifier_block); - if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { -#ifdef CONFIG_CPU_FREQ - struct cpufreq_policy policy; - memset(&policy, 0, sizeof(policy)); - cpu = get_cpu(); - cpufreq_get_policy(&policy, cpu); - if (policy.cpuinfo.max_freq) - max_tsc_khz = policy.cpuinfo.max_freq; - put_cpu(); -#endif - cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block, - CPUFREQ_TRANSITION_NOTIFIER); - } - pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz); - for_each_online_cpu(cpu) - smp_call_function_single(cpu, tsc_khz_changed, NULL, 1); -} - -static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu); - -int kvm_is_in_guest(void) -{ - return __this_cpu_read(current_vcpu) != NULL; -} - -static int kvm_is_user_mode(void) -{ - int user_mode = 3; - - if (__this_cpu_read(current_vcpu)) - user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu)); - - return user_mode != 0; -} - -static unsigned long kvm_get_guest_ip(void) -{ - unsigned long ip = 0; - - if (__this_cpu_read(current_vcpu)) - ip = kvm_rip_read(__this_cpu_read(current_vcpu)); - - return ip; -} - -static struct perf_guest_info_callbacks kvm_guest_cbs = { - .is_in_guest = kvm_is_in_guest, - .is_user_mode = kvm_is_user_mode, - .get_guest_ip = kvm_get_guest_ip, -}; - -void kvm_before_handle_nmi(struct kvm_vcpu *vcpu) -{ - __this_cpu_write(current_vcpu, vcpu); -} -EXPORT_SYMBOL_GPL(kvm_before_handle_nmi); - -void kvm_after_handle_nmi(struct kvm_vcpu *vcpu) -{ - __this_cpu_write(current_vcpu, NULL); -} -EXPORT_SYMBOL_GPL(kvm_after_handle_nmi); - -static void kvm_set_mmio_spte_mask(void) -{ - u64 mask; - int maxphyaddr = boot_cpu_data.x86_phys_bits; - - /* - * Set the reserved bits and the present bit of an paging-structure - * entry to generate page fault with PFER.RSV = 1. - */ - mask = ((1ull << (62 - maxphyaddr + 1)) - 1) << maxphyaddr; - mask |= 1ull; - -#ifdef CONFIG_X86_64 - /* - * If reserved bit is not supported, clear the present bit to disable - * mmio page fault. - */ - if (maxphyaddr == 52) - mask &= ~1ull; -#endif - - kvm_mmu_set_mmio_spte_mask(mask); -} - -int kvm_arch_init(void *opaque) -{ - int r; - struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque; - - if (kvm_x86_ops) { - printk(KERN_ERR "kvm: already loaded the other module\n"); - r = -EEXIST; - goto out; - } - - if (!ops->cpu_has_kvm_support()) { - printk(KERN_ERR "kvm: no hardware support\n"); - r = -EOPNOTSUPP; - goto out; - } - if (ops->disabled_by_bios()) { - printk(KERN_ERR "kvm: disabled by bios\n"); - r = -EOPNOTSUPP; - goto out; - } - - r = kvm_mmu_module_init(); - if (r) - goto out; - - kvm_set_mmio_spte_mask(); - kvm_init_msr_list(); - - kvm_x86_ops = ops; - kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK, - PT_DIRTY_MASK, PT64_NX_MASK, 0); - - kvm_timer_init(); - - perf_register_guest_info_callbacks(&kvm_guest_cbs); - - if (cpu_has_xsave) - host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); - - return 0; - -out: - return r; -} - -void kvm_arch_exit(void) -{ - perf_unregister_guest_info_callbacks(&kvm_guest_cbs); - - if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) - cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, - CPUFREQ_TRANSITION_NOTIFIER); - unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block); - kvm_x86_ops = NULL; - kvm_mmu_module_exit(); -} - -int kvm_emulate_halt(struct kvm_vcpu *vcpu) -{ - ++vcpu->stat.halt_exits; - if (irqchip_in_kernel(vcpu->kvm)) { - vcpu->arch.mp_state = KVM_MP_STATE_HALTED; - return 1; - } else { - vcpu->run->exit_reason = KVM_EXIT_HLT; - return 0; - } -} -EXPORT_SYMBOL_GPL(kvm_emulate_halt); - -int kvm_hv_hypercall(struct kvm_vcpu *vcpu) -{ - u64 param, ingpa, outgpa, ret; - uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0; - bool fast, longmode; - int cs_db, cs_l; - - /* - * hypercall generates UD from non zero cpl and real mode - * per HYPER-V spec - */ - if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) { - kvm_queue_exception(vcpu, UD_VECTOR); - return 0; - } - - kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); - longmode = is_long_mode(vcpu) && cs_l == 1; - - if (!longmode) { - param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) | - (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff); - ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) | - (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff); - outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) | - (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff); - } -#ifdef CONFIG_X86_64 - else { - param = kvm_register_read(vcpu, VCPU_REGS_RCX); - ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX); - outgpa = kvm_register_read(vcpu, VCPU_REGS_R8); - } -#endif - - code = param & 0xffff; - fast = (param >> 16) & 0x1; - rep_cnt = (param >> 32) & 0xfff; - rep_idx = (param >> 48) & 0xfff; - - trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa); - - switch (code) { - case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT: - kvm_vcpu_on_spin(vcpu); - break; - default: - res = HV_STATUS_INVALID_HYPERCALL_CODE; - break; - } - - ret = res | (((u64)rep_done & 0xfff) << 32); - if (longmode) { - kvm_register_write(vcpu, VCPU_REGS_RAX, ret); - } else { - kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32); - kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff); - } - - return 1; -} - -int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) -{ - unsigned long nr, a0, a1, a2, a3, ret; - int r = 1; - - if (kvm_hv_hypercall_enabled(vcpu->kvm)) - return kvm_hv_hypercall(vcpu); - - nr = kvm_register_read(vcpu, VCPU_REGS_RAX); - a0 = kvm_register_read(vcpu, VCPU_REGS_RBX); - a1 = kvm_register_read(vcpu, VCPU_REGS_RCX); - a2 = kvm_register_read(vcpu, VCPU_REGS_RDX); - a3 = kvm_register_read(vcpu, VCPU_REGS_RSI); - - trace_kvm_hypercall(nr, a0, a1, a2, a3); - - if (!is_long_mode(vcpu)) { - nr &= 0xFFFFFFFF; - a0 &= 0xFFFFFFFF; - a1 &= 0xFFFFFFFF; - a2 &= 0xFFFFFFFF; - a3 &= 0xFFFFFFFF; - } - - if (kvm_x86_ops->get_cpl(vcpu) != 0) { - ret = -KVM_EPERM; - goto out; - } - - switch (nr) { - case KVM_HC_VAPIC_POLL_IRQ: - ret = 0; - break; - default: - ret = -KVM_ENOSYS; - break; - } -out: - kvm_register_write(vcpu, VCPU_REGS_RAX, ret); - ++vcpu->stat.hypercalls; - return r; -} -EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); - -int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - char instruction[3]; - unsigned long rip = kvm_rip_read(vcpu); - - /* - * Blow out the MMU to ensure that no other VCPU has an active mapping - * to ensure that the updated hypercall appears atomically across all - * VCPUs. - */ - kvm_mmu_zap_all(vcpu->kvm); - - kvm_x86_ops->patch_hypercall(vcpu, instruction); - - return emulator_write_emulated(ctxt, rip, instruction, 3, NULL); -} - -/* - * Check if userspace requested an interrupt window, and that the - * interrupt window is open. - * - * No need to exit to userspace if we already have an interrupt queued. - */ -static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu) -{ - return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) && - vcpu->run->request_interrupt_window && - kvm_arch_interrupt_allowed(vcpu)); -} - -static void post_kvm_run_save(struct kvm_vcpu *vcpu) -{ - struct kvm_run *kvm_run = vcpu->run; - - kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0; - kvm_run->cr8 = kvm_get_cr8(vcpu); - kvm_run->apic_base = kvm_get_apic_base(vcpu); - if (irqchip_in_kernel(vcpu->kvm)) - kvm_run->ready_for_interrupt_injection = 1; - else - kvm_run->ready_for_interrupt_injection = - kvm_arch_interrupt_allowed(vcpu) && - !kvm_cpu_has_interrupt(vcpu) && - !kvm_event_needs_reinjection(vcpu); -} - -static void vapic_enter(struct kvm_vcpu *vcpu) -{ - struct kvm_lapic *apic = vcpu->arch.apic; - struct page *page; - - if (!apic || !apic->vapic_addr) - return; - - page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT); - - vcpu->arch.apic->vapic_page = page; -} - -static void vapic_exit(struct kvm_vcpu *vcpu) -{ - struct kvm_lapic *apic = vcpu->arch.apic; - int idx; - - if (!apic || !apic->vapic_addr) - return; - - idx = srcu_read_lock(&vcpu->kvm->srcu); - kvm_release_page_dirty(apic->vapic_page); - mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT); - srcu_read_unlock(&vcpu->kvm->srcu, idx); -} - -static void update_cr8_intercept(struct kvm_vcpu *vcpu) -{ - int max_irr, tpr; - - if (!kvm_x86_ops->update_cr8_intercept) - return; - - if (!vcpu->arch.apic) - return; - - if (!vcpu->arch.apic->vapic_addr) - max_irr = kvm_lapic_find_highest_irr(vcpu); - else - max_irr = -1; - - if (max_irr != -1) - max_irr >>= 4; - - tpr = kvm_lapic_get_cr8(vcpu); - - kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr); -} - -static void inject_pending_event(struct kvm_vcpu *vcpu) -{ - /* try to reinject previous events if any */ - if (vcpu->arch.exception.pending) { - trace_kvm_inj_exception(vcpu->arch.exception.nr, - vcpu->arch.exception.has_error_code, - vcpu->arch.exception.error_code); - kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr, - vcpu->arch.exception.has_error_code, - vcpu->arch.exception.error_code, - vcpu->arch.exception.reinject); - return; - } - - if (vcpu->arch.nmi_injected) { - kvm_x86_ops->set_nmi(vcpu); - return; - } - - if (vcpu->arch.interrupt.pending) { - kvm_x86_ops->set_irq(vcpu); - return; - } - - /* try to inject new event if pending */ - if (vcpu->arch.nmi_pending) { - if (kvm_x86_ops->nmi_allowed(vcpu)) { - --vcpu->arch.nmi_pending; - vcpu->arch.nmi_injected = true; - kvm_x86_ops->set_nmi(vcpu); - } - } else if (kvm_cpu_has_interrupt(vcpu)) { - if (kvm_x86_ops->interrupt_allowed(vcpu)) { - kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu), - false); - kvm_x86_ops->set_irq(vcpu); - } - } -} - -static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu) -{ - if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) && - !vcpu->guest_xcr0_loaded) { - /* kvm_set_xcr() also depends on this */ - xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0); - vcpu->guest_xcr0_loaded = 1; - } -} - -static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu) -{ - if (vcpu->guest_xcr0_loaded) { - if (vcpu->arch.xcr0 != host_xcr0) - xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0); - vcpu->guest_xcr0_loaded = 0; - } -} - -static void process_nmi(struct kvm_vcpu *vcpu) -{ - unsigned limit = 2; - - /* - * x86 is limited to one NMI running, and one NMI pending after it. - * If an NMI is already in progress, limit further NMIs to just one. - * Otherwise, allow two (and we'll inject the first one immediately). - */ - if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected) - limit = 1; - - vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0); - vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit); - kvm_make_request(KVM_REQ_EVENT, vcpu); -} - -static int vcpu_enter_guest(struct kvm_vcpu *vcpu) -{ - int r; - bool req_int_win = !irqchip_in_kernel(vcpu->kvm) && - vcpu->run->request_interrupt_window; - bool req_immediate_exit = 0; - - if (vcpu->requests) { - if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) - kvm_mmu_unload(vcpu); - if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu)) - __kvm_migrate_timers(vcpu); - if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) { - r = kvm_guest_time_update(vcpu); - if (unlikely(r)) - goto out; - } - if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu)) - kvm_mmu_sync_roots(vcpu); - if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) - kvm_x86_ops->tlb_flush(vcpu); - if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) { - vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS; - r = 0; - goto out; - } - if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) { - vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; - r = 0; - goto out; - } - if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) { - vcpu->fpu_active = 0; - kvm_x86_ops->fpu_deactivate(vcpu); - } - if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) { - /* Page is swapped out. Do synthetic halt */ - vcpu->arch.apf.halted = true; - r = 1; - goto out; - } - if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) - record_steal_time(vcpu); - if (kvm_check_request(KVM_REQ_NMI, vcpu)) - process_nmi(vcpu); - req_immediate_exit = - kvm_check_request(KVM_REQ_IMMEDIATE_EXIT, vcpu); - if (kvm_check_request(KVM_REQ_PMU, vcpu)) - kvm_handle_pmu_event(vcpu); - if (kvm_check_request(KVM_REQ_PMI, vcpu)) - kvm_deliver_pmi(vcpu); - } - - r = kvm_mmu_reload(vcpu); - if (unlikely(r)) - goto out; - - if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) { - inject_pending_event(vcpu); - - /* enable NMI/IRQ window open exits if needed */ - if (vcpu->arch.nmi_pending) - kvm_x86_ops->enable_nmi_window(vcpu); - else if (kvm_cpu_has_interrupt(vcpu) || req_int_win) - kvm_x86_ops->enable_irq_window(vcpu); - - if (kvm_lapic_enabled(vcpu)) { - update_cr8_intercept(vcpu); - kvm_lapic_sync_to_vapic(vcpu); - } - } - - preempt_disable(); - - kvm_x86_ops->prepare_guest_switch(vcpu); - if (vcpu->fpu_active) - kvm_load_guest_fpu(vcpu); - kvm_load_guest_xcr0(vcpu); - - vcpu->mode = IN_GUEST_MODE; - - /* We should set ->mode before check ->requests, - * see the comment in make_all_cpus_request. - */ - smp_mb(); - - local_irq_disable(); - - if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests - || need_resched() || signal_pending(current)) { - vcpu->mode = OUTSIDE_GUEST_MODE; - smp_wmb(); - local_irq_enable(); - preempt_enable(); - kvm_x86_ops->cancel_injection(vcpu); - r = 1; - goto out; - } - - srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); - - if (req_immediate_exit) - smp_send_reschedule(vcpu->cpu); - - kvm_guest_enter(); - - if (unlikely(vcpu->arch.switch_db_regs)) { - set_debugreg(0, 7); - set_debugreg(vcpu->arch.eff_db[0], 0); - set_debugreg(vcpu->arch.eff_db[1], 1); - set_debugreg(vcpu->arch.eff_db[2], 2); - set_debugreg(vcpu->arch.eff_db[3], 3); - } - - trace_kvm_entry(vcpu->vcpu_id); - kvm_x86_ops->run(vcpu); - - /* - * If the guest has used debug registers, at least dr7 - * will be disabled while returning to the host. - * If we don't have active breakpoints in the host, we don't - * care about the messed up debug address registers. But if - * we have some of them active, restore the old state. - */ - if (hw_breakpoint_active()) - hw_breakpoint_restore(); - - vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu); - - vcpu->mode = OUTSIDE_GUEST_MODE; - smp_wmb(); - local_irq_enable(); - - ++vcpu->stat.exits; - - /* - * We must have an instruction between local_irq_enable() and - * kvm_guest_exit(), so the timer interrupt isn't delayed by - * the interrupt shadow. The stat.exits increment will do nicely. - * But we need to prevent reordering, hence this barrier(): - */ - barrier(); - - kvm_guest_exit(); - - preempt_enable(); - - vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); - - /* - * Profile KVM exit RIPs: - */ - if (unlikely(prof_on == KVM_PROFILING)) { - unsigned long rip = kvm_rip_read(vcpu); - profile_hit(KVM_PROFILING, (void *)rip); - } - - if (unlikely(vcpu->arch.tsc_always_catchup)) - kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); - - kvm_lapic_sync_from_vapic(vcpu); - - r = kvm_x86_ops->handle_exit(vcpu); -out: - return r; -} - - -static int __vcpu_run(struct kvm_vcpu *vcpu) -{ - int r; - struct kvm *kvm = vcpu->kvm; - - if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) { - pr_debug("vcpu %d received sipi with vector # %x\n", - vcpu->vcpu_id, vcpu->arch.sipi_vector); - kvm_lapic_reset(vcpu); - r = kvm_arch_vcpu_reset(vcpu); - if (r) - return r; - vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; - } - - vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); - vapic_enter(vcpu); - - r = 1; - while (r > 0) { - if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && - !vcpu->arch.apf.halted) - r = vcpu_enter_guest(vcpu); - else { - srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); - kvm_vcpu_block(vcpu); - vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); - if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) - { - switch(vcpu->arch.mp_state) { - case KVM_MP_STATE_HALTED: - vcpu->arch.mp_state = - KVM_MP_STATE_RUNNABLE; - case KVM_MP_STATE_RUNNABLE: - vcpu->arch.apf.halted = false; - break; - case KVM_MP_STATE_SIPI_RECEIVED: - default: - r = -EINTR; - break; - } - } - } - - if (r <= 0) - break; - - clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests); - if (kvm_cpu_has_pending_timer(vcpu)) - kvm_inject_pending_timer_irqs(vcpu); - - if (dm_request_for_irq_injection(vcpu)) { - r = -EINTR; - vcpu->run->exit_reason = KVM_EXIT_INTR; - ++vcpu->stat.request_irq_exits; - } - - kvm_check_async_pf_completion(vcpu); - - if (signal_pending(current)) { - r = -EINTR; - vcpu->run->exit_reason = KVM_EXIT_INTR; - ++vcpu->stat.signal_exits; - } - if (need_resched()) { - srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); - kvm_resched(vcpu); - vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); - } - } - - srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); - - vapic_exit(vcpu); - - return r; -} - -static int complete_mmio(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - int r; - - if (!(vcpu->arch.pio.count || vcpu->mmio_needed)) - return 1; - - if (vcpu->mmio_needed) { - vcpu->mmio_needed = 0; - if (!vcpu->mmio_is_write) - memcpy(vcpu->mmio_data + vcpu->mmio_index, - run->mmio.data, 8); - vcpu->mmio_index += 8; - if (vcpu->mmio_index < vcpu->mmio_size) { - run->exit_reason = KVM_EXIT_MMIO; - run->mmio.phys_addr = vcpu->mmio_phys_addr + vcpu->mmio_index; - memcpy(run->mmio.data, vcpu->mmio_data + vcpu->mmio_index, 8); - run->mmio.len = min(vcpu->mmio_size - vcpu->mmio_index, 8); - run->mmio.is_write = vcpu->mmio_is_write; - vcpu->mmio_needed = 1; - return 0; - } - if (vcpu->mmio_is_write) - return 1; - vcpu->mmio_read_completed = 1; - } - vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); - r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE); - srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); - if (r != EMULATE_DONE) - return 0; - return 1; -} - -int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) -{ - int r; - sigset_t sigsaved; - - if (!tsk_used_math(current) && init_fpu(current)) - return -ENOMEM; - - if (vcpu->sigset_active) - sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); - - if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) { - kvm_vcpu_block(vcpu); - clear_bit(KVM_REQ_UNHALT, &vcpu->requests); - r = -EAGAIN; - goto out; - } - - /* re-sync apic's tpr */ - if (!irqchip_in_kernel(vcpu->kvm)) { - if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) { - r = -EINVAL; - goto out; - } - } - - r = complete_mmio(vcpu); - if (r <= 0) - goto out; - - r = __vcpu_run(vcpu); - -out: - post_kvm_run_save(vcpu); - if (vcpu->sigset_active) - sigprocmask(SIG_SETMASK, &sigsaved, NULL); - - return r; -} - -int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) -{ - if (vcpu->arch.emulate_regs_need_sync_to_vcpu) { - /* - * We are here if userspace calls get_regs() in the middle of - * instruction emulation. Registers state needs to be copied - * back from emulation context to vcpu. Usrapace shouldn't do - * that usually, but some bad designed PV devices (vmware - * backdoor interface) need this to work - */ - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); - vcpu->arch.emulate_regs_need_sync_to_vcpu = false; - } - regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX); - regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX); - regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX); - regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX); - regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI); - regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI); - regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP); - regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP); -#ifdef CONFIG_X86_64 - regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8); - regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9); - regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10); - regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11); - regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12); - regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13); - regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14); - regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15); -#endif - - regs->rip = kvm_rip_read(vcpu); - regs->rflags = kvm_get_rflags(vcpu); - - return 0; -} - -int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) -{ - vcpu->arch.emulate_regs_need_sync_from_vcpu = true; - vcpu->arch.emulate_regs_need_sync_to_vcpu = false; - - kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax); - kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx); - kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx); - kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx); - kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi); - kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi); - kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp); - kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp); -#ifdef CONFIG_X86_64 - kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8); - kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9); - kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10); - kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11); - kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12); - kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13); - kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14); - kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15); -#endif - - kvm_rip_write(vcpu, regs->rip); - kvm_set_rflags(vcpu, regs->rflags); - - vcpu->arch.exception.pending = false; - - kvm_make_request(KVM_REQ_EVENT, vcpu); - - return 0; -} - -void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) -{ - struct kvm_segment cs; - - kvm_get_segment(vcpu, &cs, VCPU_SREG_CS); - *db = cs.db; - *l = cs.l; -} -EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); - -int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, - struct kvm_sregs *sregs) -{ - struct desc_ptr dt; - - kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); - kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); - kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES); - kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); - kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); - kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); - - kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); - kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); - - kvm_x86_ops->get_idt(vcpu, &dt); - sregs->idt.limit = dt.size; - sregs->idt.base = dt.address; - kvm_x86_ops->get_gdt(vcpu, &dt); - sregs->gdt.limit = dt.size; - sregs->gdt.base = dt.address; - - sregs->cr0 = kvm_read_cr0(vcpu); - sregs->cr2 = vcpu->arch.cr2; - sregs->cr3 = kvm_read_cr3(vcpu); - sregs->cr4 = kvm_read_cr4(vcpu); - sregs->cr8 = kvm_get_cr8(vcpu); - sregs->efer = vcpu->arch.efer; - sregs->apic_base = kvm_get_apic_base(vcpu); - - memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap); - - if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft) - set_bit(vcpu->arch.interrupt.nr, - (unsigned long *)sregs->interrupt_bitmap); - - return 0; -} - -int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, - struct kvm_mp_state *mp_state) -{ - mp_state->mp_state = vcpu->arch.mp_state; - return 0; -} - -int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, - struct kvm_mp_state *mp_state) -{ - vcpu->arch.mp_state = mp_state->mp_state; - kvm_make_request(KVM_REQ_EVENT, vcpu); - return 0; -} - -int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, - int reason, bool has_error_code, u32 error_code) -{ - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - int ret; - - init_emulate_ctxt(vcpu); - - ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason, - has_error_code, error_code); - - if (ret) - return EMULATE_FAIL; - - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); - kvm_rip_write(vcpu, ctxt->eip); - kvm_set_rflags(vcpu, ctxt->eflags); - kvm_make_request(KVM_REQ_EVENT, vcpu); - return EMULATE_DONE; -} -EXPORT_SYMBOL_GPL(kvm_task_switch); - -int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, - struct kvm_sregs *sregs) -{ - int mmu_reset_needed = 0; - int pending_vec, max_bits, idx; - struct desc_ptr dt; - - dt.size = sregs->idt.limit; - dt.address = sregs->idt.base; - kvm_x86_ops->set_idt(vcpu, &dt); - dt.size = sregs->gdt.limit; - dt.address = sregs->gdt.base; - kvm_x86_ops->set_gdt(vcpu, &dt); - - vcpu->arch.cr2 = sregs->cr2; - mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3; - vcpu->arch.cr3 = sregs->cr3; - __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); - - kvm_set_cr8(vcpu, sregs->cr8); - - mmu_reset_needed |= vcpu->arch.efer != sregs->efer; - kvm_x86_ops->set_efer(vcpu, sregs->efer); - kvm_set_apic_base(vcpu, sregs->apic_base); - - mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0; - kvm_x86_ops->set_cr0(vcpu, sregs->cr0); - vcpu->arch.cr0 = sregs->cr0; - - mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4; - kvm_x86_ops->set_cr4(vcpu, sregs->cr4); - if (sregs->cr4 & X86_CR4_OSXSAVE) - kvm_update_cpuid(vcpu); - - idx = srcu_read_lock(&vcpu->kvm->srcu); - if (!is_long_mode(vcpu) && is_pae(vcpu)) { - load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)); - mmu_reset_needed = 1; - } - srcu_read_unlock(&vcpu->kvm->srcu, idx); - - if (mmu_reset_needed) - kvm_mmu_reset_context(vcpu); - - max_bits = (sizeof sregs->interrupt_bitmap) << 3; - pending_vec = find_first_bit( - (const unsigned long *)sregs->interrupt_bitmap, max_bits); - if (pending_vec < max_bits) { - kvm_queue_interrupt(vcpu, pending_vec, false); - pr_debug("Set back pending irq %d\n", pending_vec); - } - - kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); - kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); - kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES); - kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); - kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); - kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); - - kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); - kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); - - update_cr8_intercept(vcpu); - - /* Older userspace won't unhalt the vcpu on reset. */ - if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 && - sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 && - !is_protmode(vcpu)) - vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; - - kvm_make_request(KVM_REQ_EVENT, vcpu); - - return 0; -} - -int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, - struct kvm_guest_debug *dbg) -{ - unsigned long rflags; - int i, r; - - if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) { - r = -EBUSY; - if (vcpu->arch.exception.pending) - goto out; - if (dbg->control & KVM_GUESTDBG_INJECT_DB) - kvm_queue_exception(vcpu, DB_VECTOR); - else - kvm_queue_exception(vcpu, BP_VECTOR); - } - - /* - * Read rflags as long as potentially injected trace flags are still - * filtered out. - */ - rflags = kvm_get_rflags(vcpu); - - vcpu->guest_debug = dbg->control; - if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE)) - vcpu->guest_debug = 0; - - if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { - for (i = 0; i < KVM_NR_DB_REGS; ++i) - vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; - vcpu->arch.switch_db_regs = - (dbg->arch.debugreg[7] & DR7_BP_EN_MASK); - } else { - for (i = 0; i < KVM_NR_DB_REGS; i++) - vcpu->arch.eff_db[i] = vcpu->arch.db[i]; - vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK); - } - - if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) - vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) + - get_segment_base(vcpu, VCPU_SREG_CS); - - /* - * Trigger an rflags update that will inject or remove the trace - * flags. - */ - kvm_set_rflags(vcpu, rflags); - - kvm_x86_ops->set_guest_debug(vcpu, dbg); - - r = 0; - -out: - - return r; -} - -/* - * Translate a guest virtual address to a guest physical address. - */ -int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, - struct kvm_translation *tr) -{ - unsigned long vaddr = tr->linear_address; - gpa_t gpa; - int idx; - - idx = srcu_read_lock(&vcpu->kvm->srcu); - gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL); - srcu_read_unlock(&vcpu->kvm->srcu, idx); - tr->physical_address = gpa; - tr->valid = gpa != UNMAPPED_GVA; - tr->writeable = 1; - tr->usermode = 0; - - return 0; -} - -int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - struct i387_fxsave_struct *fxsave = - &vcpu->arch.guest_fpu.state->fxsave; - - memcpy(fpu->fpr, fxsave->st_space, 128); - fpu->fcw = fxsave->cwd; - fpu->fsw = fxsave->swd; - fpu->ftwx = fxsave->twd; - fpu->last_opcode = fxsave->fop; - fpu->last_ip = fxsave->rip; - fpu->last_dp = fxsave->rdp; - memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); - - return 0; -} - -int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - struct i387_fxsave_struct *fxsave = - &vcpu->arch.guest_fpu.state->fxsave; - - memcpy(fxsave->st_space, fpu->fpr, 128); - fxsave->cwd = fpu->fcw; - fxsave->swd = fpu->fsw; - fxsave->twd = fpu->ftwx; - fxsave->fop = fpu->last_opcode; - fxsave->rip = fpu->last_ip; - fxsave->rdp = fpu->last_dp; - memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); - - return 0; -} - -int fx_init(struct kvm_vcpu *vcpu) -{ - int err; - - err = fpu_alloc(&vcpu->arch.guest_fpu); - if (err) - return err; - - fpu_finit(&vcpu->arch.guest_fpu); - - /* - * Ensure guest xcr0 is valid for loading - */ - vcpu->arch.xcr0 = XSTATE_FP; - - vcpu->arch.cr0 |= X86_CR0_ET; - - return 0; -} -EXPORT_SYMBOL_GPL(fx_init); - -static void fx_free(struct kvm_vcpu *vcpu) -{ - fpu_free(&vcpu->arch.guest_fpu); -} - -void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) -{ - if (vcpu->guest_fpu_loaded) - return; - - /* - * Restore all possible states in the guest, - * and assume host would use all available bits. - * Guest xcr0 would be loaded later. - */ - kvm_put_guest_xcr0(vcpu); - vcpu->guest_fpu_loaded = 1; - unlazy_fpu(current); - fpu_restore_checking(&vcpu->arch.guest_fpu); - trace_kvm_fpu(1); -} - -void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) -{ - kvm_put_guest_xcr0(vcpu); - - if (!vcpu->guest_fpu_loaded) - return; - - vcpu->guest_fpu_loaded = 0; - fpu_save_init(&vcpu->arch.guest_fpu); - ++vcpu->stat.fpu_reload; - kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu); - trace_kvm_fpu(0); -} - -void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) -{ - kvmclock_reset(vcpu); - - free_cpumask_var(vcpu->arch.wbinvd_dirty_mask); - fx_free(vcpu); - kvm_x86_ops->vcpu_free(vcpu); -} - -struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, - unsigned int id) -{ - if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0) - printk_once(KERN_WARNING - "kvm: SMP vm created on host with unstable TSC; " - "guest TSC will not be reliable\n"); - return kvm_x86_ops->vcpu_create(kvm, id); -} - -int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) -{ - int r; - - vcpu->arch.mtrr_state.have_fixed = 1; - vcpu_load(vcpu); - r = kvm_arch_vcpu_reset(vcpu); - if (r == 0) - r = kvm_mmu_setup(vcpu); - vcpu_put(vcpu); - - return r; -} - -void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) -{ - vcpu->arch.apf.msr_val = 0; - - vcpu_load(vcpu); - kvm_mmu_unload(vcpu); - vcpu_put(vcpu); - - fx_free(vcpu); - kvm_x86_ops->vcpu_free(vcpu); -} - -int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) -{ - atomic_set(&vcpu->arch.nmi_queued, 0); - vcpu->arch.nmi_pending = 0; - vcpu->arch.nmi_injected = false; - - vcpu->arch.switch_db_regs = 0; - memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); - vcpu->arch.dr6 = DR6_FIXED_1; - vcpu->arch.dr7 = DR7_FIXED_1; - - kvm_make_request(KVM_REQ_EVENT, vcpu); - vcpu->arch.apf.msr_val = 0; - vcpu->arch.st.msr_val = 0; - - kvmclock_reset(vcpu); - - kvm_clear_async_pf_completion_queue(vcpu); - kvm_async_pf_hash_reset(vcpu); - vcpu->arch.apf.halted = false; - - kvm_pmu_reset(vcpu); - - return kvm_x86_ops->vcpu_reset(vcpu); -} - -int kvm_arch_hardware_enable(void *garbage) -{ - struct kvm *kvm; - struct kvm_vcpu *vcpu; - int i; - int ret; - u64 local_tsc; - u64 max_tsc = 0; - bool stable, backwards_tsc = false; - - kvm_shared_msr_cpu_online(); - ret = kvm_x86_ops->hardware_enable(garbage); - if (ret != 0) - return ret; - - local_tsc = native_read_tsc(); - stable = !check_tsc_unstable(); - list_for_each_entry(kvm, &vm_list, vm_list) { - kvm_for_each_vcpu(i, vcpu, kvm) { - if (!stable && vcpu->cpu == smp_processor_id()) - set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests); - if (stable && vcpu->arch.last_host_tsc > local_tsc) { - backwards_tsc = true; - if (vcpu->arch.last_host_tsc > max_tsc) - max_tsc = vcpu->arch.last_host_tsc; - } - } - } - - /* - * Sometimes, even reliable TSCs go backwards. This happens on - * platforms that reset TSC during suspend or hibernate actions, but - * maintain synchronization. We must compensate. Fortunately, we can - * detect that condition here, which happens early in CPU bringup, - * before any KVM threads can be running. Unfortunately, we can't - * bring the TSCs fully up to date with real time, as we aren't yet far - * enough into CPU bringup that we know how much real time has actually - * elapsed; our helper function, get_kernel_ns() will be using boot - * variables that haven't been updated yet. - * - * So we simply find the maximum observed TSC above, then record the - * adjustment to TSC in each VCPU. When the VCPU later gets loaded, - * the adjustment will be applied. Note that we accumulate - * adjustments, in case multiple suspend cycles happen before some VCPU - * gets a chance to run again. In the event that no KVM threads get a - * chance to run, we will miss the entire elapsed period, as we'll have - * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may - * loose cycle time. This isn't too big a deal, since the loss will be - * uniform across all VCPUs (not to mention the scenario is extremely - * unlikely). It is possible that a second hibernate recovery happens - * much faster than a first, causing the observed TSC here to be - * smaller; this would require additional padding adjustment, which is - * why we set last_host_tsc to the local tsc observed here. - * - * N.B. - this code below runs only on platforms with reliable TSC, - * as that is the only way backwards_tsc is set above. Also note - * that this runs for ALL vcpus, which is not a bug; all VCPUs should - * have the same delta_cyc adjustment applied if backwards_tsc - * is detected. Note further, this adjustment is only done once, - * as we reset last_host_tsc on all VCPUs to stop this from being - * called multiple times (one for each physical CPU bringup). - * - * Platforms with unnreliable TSCs don't have to deal with this, they - * will be compensated by the logic in vcpu_load, which sets the TSC to - * catchup mode. This will catchup all VCPUs to real time, but cannot - * guarantee that they stay in perfect synchronization. - */ - if (backwards_tsc) { - u64 delta_cyc = max_tsc - local_tsc; - list_for_each_entry(kvm, &vm_list, vm_list) { - kvm_for_each_vcpu(i, vcpu, kvm) { - vcpu->arch.tsc_offset_adjustment += delta_cyc; - vcpu->arch.last_host_tsc = local_tsc; - } - - /* - * We have to disable TSC offset matching.. if you were - * booting a VM while issuing an S4 host suspend.... - * you may have some problem. Solving this issue is - * left as an exercise to the reader. - */ - kvm->arch.last_tsc_nsec = 0; - kvm->arch.last_tsc_write = 0; - } - - } - return 0; -} - -void kvm_arch_hardware_disable(void *garbage) -{ - kvm_x86_ops->hardware_disable(garbage); - drop_user_return_notifiers(garbage); -} - -int kvm_arch_hardware_setup(void) -{ - return kvm_x86_ops->hardware_setup(); -} - -void kvm_arch_hardware_unsetup(void) -{ - kvm_x86_ops->hardware_unsetup(); -} - -void kvm_arch_check_processor_compat(void *rtn) -{ - kvm_x86_ops->check_processor_compatibility(rtn); -} - -bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) -{ - return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL); -} - -int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) -{ - struct page *page; - struct kvm *kvm; - int r; - - BUG_ON(vcpu->kvm == NULL); - kvm = vcpu->kvm; - - vcpu->arch.emulate_ctxt.ops = &emulate_ops; - if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu)) - vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; - else - vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED; - - page = alloc_page(GFP_KERNEL | __GFP_ZERO); - if (!page) { - r = -ENOMEM; - goto fail; - } - vcpu->arch.pio_data = page_address(page); - - kvm_set_tsc_khz(vcpu, max_tsc_khz); - - r = kvm_mmu_create(vcpu); - if (r < 0) - goto fail_free_pio_data; - - if (irqchip_in_kernel(kvm)) { - r = kvm_create_lapic(vcpu); - if (r < 0) - goto fail_mmu_destroy; - } - - vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, - GFP_KERNEL); - if (!vcpu->arch.mce_banks) { - r = -ENOMEM; - goto fail_free_lapic; - } - vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS; - - if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) - goto fail_free_mce_banks; - - kvm_async_pf_hash_reset(vcpu); - kvm_pmu_init(vcpu); - - return 0; -fail_free_mce_banks: - kfree(vcpu->arch.mce_banks); -fail_free_lapic: - kvm_free_lapic(vcpu); -fail_mmu_destroy: - kvm_mmu_destroy(vcpu); -fail_free_pio_data: - free_page((unsigned long)vcpu->arch.pio_data); -fail: - return r; -} - -void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) -{ - int idx; - - kvm_pmu_destroy(vcpu); - kfree(vcpu->arch.mce_banks); - kvm_free_lapic(vcpu); - idx = srcu_read_lock(&vcpu->kvm->srcu); - kvm_mmu_destroy(vcpu); - srcu_read_unlock(&vcpu->kvm->srcu, idx); - free_page((unsigned long)vcpu->arch.pio_data); -} - -int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) -{ - if (type) - return -EINVAL; - - INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); - INIT_LIST_HEAD(&kvm->arch.assigned_dev_head); - - /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ - set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); - - raw_spin_lock_init(&kvm->arch.tsc_write_lock); - - return 0; -} - -static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) -{ - vcpu_load(vcpu); - kvm_mmu_unload(vcpu); - vcpu_put(vcpu); -} - -static void kvm_free_vcpus(struct kvm *kvm) -{ - unsigned int i; - struct kvm_vcpu *vcpu; - - /* - * Unpin any mmu pages first. - */ - kvm_for_each_vcpu(i, vcpu, kvm) { - kvm_clear_async_pf_completion_queue(vcpu); - kvm_unload_vcpu_mmu(vcpu); - } - kvm_for_each_vcpu(i, vcpu, kvm) - kvm_arch_vcpu_free(vcpu); - - mutex_lock(&kvm->lock); - for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) - kvm->vcpus[i] = NULL; - - atomic_set(&kvm->online_vcpus, 0); - mutex_unlock(&kvm->lock); -} - -void kvm_arch_sync_events(struct kvm *kvm) -{ - kvm_free_all_assigned_devices(kvm); - kvm_free_pit(kvm); -} - -void kvm_arch_destroy_vm(struct kvm *kvm) -{ - kvm_iommu_unmap_guest(kvm); - kfree(kvm->arch.vpic); - kfree(kvm->arch.vioapic); - kvm_free_vcpus(kvm); - if (kvm->arch.apic_access_page) - put_page(kvm->arch.apic_access_page); - if (kvm->arch.ept_identity_pagetable) - put_page(kvm->arch.ept_identity_pagetable); -} - -void kvm_arch_free_memslot(struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) -{ - int i; - - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { - if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) { - vfree(free->arch.lpage_info[i]); - free->arch.lpage_info[i] = NULL; - } - } -} - -int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) -{ - int i; - - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { - unsigned long ugfn; - int lpages; - int level = i + 2; - - lpages = gfn_to_index(slot->base_gfn + npages - 1, - slot->base_gfn, level) + 1; - - slot->arch.lpage_info[i] = - vzalloc(lpages * sizeof(*slot->arch.lpage_info[i])); - if (!slot->arch.lpage_info[i]) - goto out_free; - - if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i][0].write_count = 1; - if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i][lpages - 1].write_count = 1; - ugfn = slot->userspace_addr >> PAGE_SHIFT; - /* - * If the gfn and userspace address are not aligned wrt each - * other, or if explicitly asked to, disable large page - * support for this slot - */ - if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || - !kvm_largepages_enabled()) { - unsigned long j; - - for (j = 0; j < lpages; ++j) - slot->arch.lpage_info[i][j].write_count = 1; - } - } - - return 0; - -out_free: - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { - vfree(slot->arch.lpage_info[i]); - slot->arch.lpage_info[i] = NULL; - } - return -ENOMEM; -} - -int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - struct kvm_memory_slot old, - struct kvm_userspace_memory_region *mem, - int user_alloc) -{ - int npages = memslot->npages; - int map_flags = MAP_PRIVATE | MAP_ANONYMOUS; - - /* Prevent internal slot pages from being moved by fork()/COW. */ - if (memslot->id >= KVM_MEMORY_SLOTS) - map_flags = MAP_SHARED | MAP_ANONYMOUS; - - /*To keep backward compatibility with older userspace, - *x86 needs to hanlde !user_alloc case. - */ - if (!user_alloc) { - if (npages && !old.rmap) { - unsigned long userspace_addr; - - userspace_addr = vm_mmap(NULL, 0, - npages * PAGE_SIZE, - PROT_READ | PROT_WRITE, - map_flags, - 0); - - if (IS_ERR((void *)userspace_addr)) - return PTR_ERR((void *)userspace_addr); - - memslot->userspace_addr = userspace_addr; - } - } - - - return 0; -} - -void kvm_arch_commit_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot old, - int user_alloc) -{ - - int nr_mmu_pages = 0, npages = mem->memory_size >> PAGE_SHIFT; - - if (!user_alloc && !old.user_alloc && old.rmap && !npages) { - int ret; - - ret = vm_munmap(old.userspace_addr, - old.npages * PAGE_SIZE); - if (ret < 0) - printk(KERN_WARNING - "kvm_vm_ioctl_set_memory_region: " - "failed to munmap memory\n"); - } - - if (!kvm->arch.n_requested_mmu_pages) - nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm); - - spin_lock(&kvm->mmu_lock); - if (nr_mmu_pages) - kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); - kvm_mmu_slot_remove_write_access(kvm, mem->slot); - spin_unlock(&kvm->mmu_lock); -} - -void kvm_arch_flush_shadow(struct kvm *kvm) -{ - kvm_mmu_zap_all(kvm); - kvm_reload_remote_mmus(kvm); -} - -int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) -{ - return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && - !vcpu->arch.apf.halted) - || !list_empty_careful(&vcpu->async_pf.done) - || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED - || atomic_read(&vcpu->arch.nmi_queued) || - (kvm_arch_interrupt_allowed(vcpu) && - kvm_cpu_has_interrupt(vcpu)); -} - -void kvm_vcpu_kick(struct kvm_vcpu *vcpu) -{ - int me; - int cpu = vcpu->cpu; - - if (waitqueue_active(&vcpu->wq)) { - wake_up_interruptible(&vcpu->wq); - ++vcpu->stat.halt_wakeup; - } - - me = get_cpu(); - if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) - if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE) - smp_send_reschedule(cpu); - put_cpu(); -} - -int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu) -{ - return kvm_x86_ops->interrupt_allowed(vcpu); -} - -bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip) -{ - unsigned long current_rip = kvm_rip_read(vcpu) + - get_segment_base(vcpu, VCPU_SREG_CS); - - return current_rip == linear_rip; -} -EXPORT_SYMBOL_GPL(kvm_is_linear_rip); - -unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu) -{ - unsigned long rflags; - - rflags = kvm_x86_ops->get_rflags(vcpu); - if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) - rflags &= ~X86_EFLAGS_TF; - return rflags; -} -EXPORT_SYMBOL_GPL(kvm_get_rflags); - -void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) -{ - if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP && - kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip)) - rflags |= X86_EFLAGS_TF; - kvm_x86_ops->set_rflags(vcpu, rflags); - kvm_make_request(KVM_REQ_EVENT, vcpu); -} -EXPORT_SYMBOL_GPL(kvm_set_rflags); - -void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work) -{ - int r; - - if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) || - is_error_page(work->page)) - return; - - r = kvm_mmu_reload(vcpu); - if (unlikely(r)) - return; - - if (!vcpu->arch.mmu.direct_map && - work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu)) - return; - - vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true); -} - -static inline u32 kvm_async_pf_hash_fn(gfn_t gfn) -{ - return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU)); -} - -static inline u32 kvm_async_pf_next_probe(u32 key) -{ - return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1); -} - -static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) -{ - u32 key = kvm_async_pf_hash_fn(gfn); - - while (vcpu->arch.apf.gfns[key] != ~0) - key = kvm_async_pf_next_probe(key); - - vcpu->arch.apf.gfns[key] = gfn; -} - -static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn) -{ - int i; - u32 key = kvm_async_pf_hash_fn(gfn); - - for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) && - (vcpu->arch.apf.gfns[key] != gfn && - vcpu->arch.apf.gfns[key] != ~0); i++) - key = kvm_async_pf_next_probe(key); - - return key; -} - -bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) -{ - return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn; -} - -static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) -{ - u32 i, j, k; - - i = j = kvm_async_pf_gfn_slot(vcpu, gfn); - while (true) { - vcpu->arch.apf.gfns[i] = ~0; - do { - j = kvm_async_pf_next_probe(j); - if (vcpu->arch.apf.gfns[j] == ~0) - return; - k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]); - /* - * k lies cyclically in ]i,j] - * | i.k.j | - * |....j i.k.| or |.k..j i...| - */ - } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j)); - vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j]; - i = j; - } -} - -static int apf_put_user(struct kvm_vcpu *vcpu, u32 val) -{ - - return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val, - sizeof(val)); -} - -void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, - struct kvm_async_pf *work) -{ - struct x86_exception fault; - - trace_kvm_async_pf_not_present(work->arch.token, work->gva); - kvm_add_async_pf_gfn(vcpu, work->arch.gfn); - - if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) || - (vcpu->arch.apf.send_user_only && - kvm_x86_ops->get_cpl(vcpu) == 0)) - kvm_make_request(KVM_REQ_APF_HALT, vcpu); - else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) { - fault.vector = PF_VECTOR; - fault.error_code_valid = true; - fault.error_code = 0; - fault.nested_page_fault = false; - fault.address = work->arch.token; - kvm_inject_page_fault(vcpu, &fault); - } -} - -void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, - struct kvm_async_pf *work) -{ - struct x86_exception fault; - - trace_kvm_async_pf_ready(work->arch.token, work->gva); - if (is_error_page(work->page)) - work->arch.token = ~0; /* broadcast wakeup */ - else - kvm_del_async_pf_gfn(vcpu, work->arch.gfn); - - if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) && - !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) { - fault.vector = PF_VECTOR; - fault.error_code_valid = true; - fault.error_code = 0; - fault.nested_page_fault = false; - fault.address = work->arch.token; - kvm_inject_page_fault(vcpu, &fault); - } - vcpu->arch.apf.halted = false; - vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; -} - -bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) -{ - if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED)) - return true; - else - return !kvm_event_needs_reinjection(vcpu) && - kvm_x86_ops->interrupt_allowed(vcpu); -} - -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit); -EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts); |