diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/kvm/book3s_hv_rm_mmu.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/kvm/book3s_hv_rm_mmu.c | 817 |
1 files changed, 0 insertions, 817 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/ANDROID_3.4.5/arch/powerpc/kvm/book3s_hv_rm_mmu.c deleted file mode 100644 index cec4dadd..00000000 --- a/ANDROID_3.4.5/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ /dev/null @@ -1,817 +0,0 @@ -/* - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2, as - * published by the Free Software Foundation. - * - * Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> - */ - -#include <linux/types.h> -#include <linux/string.h> -#include <linux/kvm.h> -#include <linux/kvm_host.h> -#include <linux/hugetlb.h> -#include <linux/module.h> - -#include <asm/tlbflush.h> -#include <asm/kvm_ppc.h> -#include <asm/kvm_book3s.h> -#include <asm/mmu-hash64.h> -#include <asm/hvcall.h> -#include <asm/synch.h> -#include <asm/ppc-opcode.h> - -/* Translate address of a vmalloc'd thing to a linear map address */ -static void *real_vmalloc_addr(void *x) -{ - unsigned long addr = (unsigned long) x; - pte_t *p; - - p = find_linux_pte(swapper_pg_dir, addr); - if (!p || !pte_present(*p)) - return NULL; - /* assume we don't have huge pages in vmalloc space... */ - addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK); - return __va(addr); -} - -/* - * Add this HPTE into the chain for the real page. - * Must be called with the chain locked; it unlocks the chain. - */ -void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, - unsigned long *rmap, long pte_index, int realmode) -{ - struct revmap_entry *head, *tail; - unsigned long i; - - if (*rmap & KVMPPC_RMAP_PRESENT) { - i = *rmap & KVMPPC_RMAP_INDEX; - head = &kvm->arch.revmap[i]; - if (realmode) - head = real_vmalloc_addr(head); - tail = &kvm->arch.revmap[head->back]; - if (realmode) - tail = real_vmalloc_addr(tail); - rev->forw = i; - rev->back = head->back; - tail->forw = pte_index; - head->back = pte_index; - } else { - rev->forw = rev->back = pte_index; - i = pte_index; - } - smp_wmb(); - *rmap = i | KVMPPC_RMAP_REFERENCED | KVMPPC_RMAP_PRESENT; /* unlock */ -} -EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain); - -/* Remove this HPTE from the chain for a real page */ -static void remove_revmap_chain(struct kvm *kvm, long pte_index, - struct revmap_entry *rev, - unsigned long hpte_v, unsigned long hpte_r) -{ - struct revmap_entry *next, *prev; - unsigned long gfn, ptel, head; - struct kvm_memory_slot *memslot; - unsigned long *rmap; - unsigned long rcbits; - - rcbits = hpte_r & (HPTE_R_R | HPTE_R_C); - ptel = rev->guest_rpte |= rcbits; - gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); - memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); - if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) - return; - - rmap = real_vmalloc_addr(&memslot->rmap[gfn - memslot->base_gfn]); - lock_rmap(rmap); - - head = *rmap & KVMPPC_RMAP_INDEX; - next = real_vmalloc_addr(&kvm->arch.revmap[rev->forw]); - prev = real_vmalloc_addr(&kvm->arch.revmap[rev->back]); - next->back = rev->back; - prev->forw = rev->forw; - if (head == pte_index) { - head = rev->forw; - if (head == pte_index) - *rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); - else - *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head; - } - *rmap |= rcbits << KVMPPC_RMAP_RC_SHIFT; - unlock_rmap(rmap); -} - -static pte_t lookup_linux_pte(struct kvm_vcpu *vcpu, unsigned long hva, - int writing, unsigned long *pte_sizep) -{ - pte_t *ptep; - unsigned long ps = *pte_sizep; - unsigned int shift; - - ptep = find_linux_pte_or_hugepte(vcpu->arch.pgdir, hva, &shift); - if (!ptep) - return __pte(0); - if (shift) - *pte_sizep = 1ul << shift; - else - *pte_sizep = PAGE_SIZE; - if (ps > *pte_sizep) - return __pte(0); - if (!pte_present(*ptep)) - return __pte(0); - return kvmppc_read_update_linux_pte(ptep, writing); -} - -static inline void unlock_hpte(unsigned long *hpte, unsigned long hpte_v) -{ - asm volatile(PPC_RELEASE_BARRIER "" : : : "memory"); - hpte[0] = hpte_v; -} - -long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, - long pte_index, unsigned long pteh, unsigned long ptel) -{ - struct kvm *kvm = vcpu->kvm; - unsigned long i, pa, gpa, gfn, psize; - unsigned long slot_fn, hva; - unsigned long *hpte; - struct revmap_entry *rev; - unsigned long g_ptel = ptel; - struct kvm_memory_slot *memslot; - unsigned long *physp, pte_size; - unsigned long is_io; - unsigned long *rmap; - pte_t pte; - unsigned int writing; - unsigned long mmu_seq; - unsigned long rcbits; - bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; - - psize = hpte_page_size(pteh, ptel); - if (!psize) - return H_PARAMETER; - writing = hpte_is_writable(ptel); - pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); - - /* used later to detect if we might have been invalidated */ - mmu_seq = kvm->mmu_notifier_seq; - smp_rmb(); - - /* Find the memslot (if any) for this address */ - gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); - gfn = gpa >> PAGE_SHIFT; - memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); - pa = 0; - is_io = ~0ul; - rmap = NULL; - if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) { - /* PPC970 can't do emulated MMIO */ - if (!cpu_has_feature(CPU_FTR_ARCH_206)) - return H_PARAMETER; - /* Emulated MMIO - mark this with key=31 */ - pteh |= HPTE_V_ABSENT; - ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO; - goto do_insert; - } - - /* Check if the requested page fits entirely in the memslot. */ - if (!slot_is_aligned(memslot, psize)) - return H_PARAMETER; - slot_fn = gfn - memslot->base_gfn; - rmap = &memslot->rmap[slot_fn]; - - if (!kvm->arch.using_mmu_notifiers) { - physp = kvm->arch.slot_phys[memslot->id]; - if (!physp) - return H_PARAMETER; - physp += slot_fn; - if (realmode) - physp = real_vmalloc_addr(physp); - pa = *physp; - if (!pa) - return H_TOO_HARD; - is_io = pa & (HPTE_R_I | HPTE_R_W); - pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); - pa &= PAGE_MASK; - } else { - /* Translate to host virtual address */ - hva = gfn_to_hva_memslot(memslot, gfn); - - /* Look up the Linux PTE for the backing page */ - pte_size = psize; - pte = lookup_linux_pte(vcpu, hva, writing, &pte_size); - if (pte_present(pte)) { - if (writing && !pte_write(pte)) - /* make the actual HPTE be read-only */ - ptel = hpte_make_readonly(ptel); - is_io = hpte_cache_bits(pte_val(pte)); - pa = pte_pfn(pte) << PAGE_SHIFT; - } - } - if (pte_size < psize) - return H_PARAMETER; - if (pa && pte_size > psize) - pa |= gpa & (pte_size - 1); - - ptel &= ~(HPTE_R_PP0 - psize); - ptel |= pa; - - if (pa) - pteh |= HPTE_V_VALID; - else - pteh |= HPTE_V_ABSENT; - - /* Check WIMG */ - if (is_io != ~0ul && !hpte_cache_flags_ok(ptel, is_io)) { - if (is_io) - return H_PARAMETER; - /* - * Allow guest to map emulated device memory as - * uncacheable, but actually make it cacheable. - */ - ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); - ptel |= HPTE_R_M; - } - - /* Find and lock the HPTEG slot to use */ - do_insert: - if (pte_index >= HPT_NPTE) - return H_PARAMETER; - if (likely((flags & H_EXACT) == 0)) { - pte_index &= ~7UL; - hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - for (i = 0; i < 8; ++i) { - if ((*hpte & HPTE_V_VALID) == 0 && - try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | - HPTE_V_ABSENT)) - break; - hpte += 2; - } - if (i == 8) { - /* - * Since try_lock_hpte doesn't retry (not even stdcx. - * failures), it could be that there is a free slot - * but we transiently failed to lock it. Try again, - * actually locking each slot and checking it. - */ - hpte -= 16; - for (i = 0; i < 8; ++i) { - while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) - cpu_relax(); - if (!(*hpte & (HPTE_V_VALID | HPTE_V_ABSENT))) - break; - *hpte &= ~HPTE_V_HVLOCK; - hpte += 2; - } - if (i == 8) - return H_PTEG_FULL; - } - pte_index += i; - } else { - hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | - HPTE_V_ABSENT)) { - /* Lock the slot and check again */ - while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) - cpu_relax(); - if (*hpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { - *hpte &= ~HPTE_V_HVLOCK; - return H_PTEG_FULL; - } - } - } - - /* Save away the guest's idea of the second HPTE dword */ - rev = &kvm->arch.revmap[pte_index]; - if (realmode) - rev = real_vmalloc_addr(rev); - if (rev) - rev->guest_rpte = g_ptel; - - /* Link HPTE into reverse-map chain */ - if (pteh & HPTE_V_VALID) { - if (realmode) - rmap = real_vmalloc_addr(rmap); - lock_rmap(rmap); - /* Check for pending invalidations under the rmap chain lock */ - if (kvm->arch.using_mmu_notifiers && - mmu_notifier_retry(vcpu, mmu_seq)) { - /* inval in progress, write a non-present HPTE */ - pteh |= HPTE_V_ABSENT; - pteh &= ~HPTE_V_VALID; - unlock_rmap(rmap); - } else { - kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, - realmode); - /* Only set R/C in real HPTE if already set in *rmap */ - rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT; - ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C); - } - } - - hpte[1] = ptel; - - /* Write the first HPTE dword, unlocking the HPTE and making it valid */ - eieio(); - hpte[0] = pteh; - asm volatile("ptesync" : : : "memory"); - - vcpu->arch.gpr[4] = pte_index; - return H_SUCCESS; -} -EXPORT_SYMBOL_GPL(kvmppc_h_enter); - -#define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token)) - -static inline int try_lock_tlbie(unsigned int *lock) -{ - unsigned int tmp, old; - unsigned int token = LOCK_TOKEN; - - asm volatile("1:lwarx %1,0,%2\n" - " cmpwi cr0,%1,0\n" - " bne 2f\n" - " stwcx. %3,0,%2\n" - " bne- 1b\n" - " isync\n" - "2:" - : "=&r" (tmp), "=&r" (old) - : "r" (lock), "r" (token) - : "cc", "memory"); - return old == 0; -} - -long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, - unsigned long pte_index, unsigned long avpn, - unsigned long va) -{ - struct kvm *kvm = vcpu->kvm; - unsigned long *hpte; - unsigned long v, r, rb; - struct revmap_entry *rev; - - if (pte_index >= HPT_NPTE) - return H_PARAMETER; - hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) - cpu_relax(); - if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || - ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) || - ((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) { - hpte[0] &= ~HPTE_V_HVLOCK; - return H_NOT_FOUND; - } - - rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); - v = hpte[0] & ~HPTE_V_HVLOCK; - if (v & HPTE_V_VALID) { - hpte[0] &= ~HPTE_V_VALID; - rb = compute_tlbie_rb(v, hpte[1], pte_index); - if (!(flags & H_LOCAL) && atomic_read(&kvm->online_vcpus) > 1) { - while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile("ptesync" : : : "memory"); - asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" - : : "r" (rb), "r" (kvm->arch.lpid)); - asm volatile("ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; - } else { - asm volatile("ptesync" : : : "memory"); - asm volatile("tlbiel %0" : : "r" (rb)); - asm volatile("ptesync" : : : "memory"); - } - /* Read PTE low word after tlbie to get final R/C values */ - remove_revmap_chain(kvm, pte_index, rev, v, hpte[1]); - } - r = rev->guest_rpte; - unlock_hpte(hpte, 0); - - vcpu->arch.gpr[4] = v; - vcpu->arch.gpr[5] = r; - return H_SUCCESS; -} - -long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) -{ - struct kvm *kvm = vcpu->kvm; - unsigned long *args = &vcpu->arch.gpr[4]; - unsigned long *hp, *hptes[4], tlbrb[4]; - long int i, j, k, n, found, indexes[4]; - unsigned long flags, req, pte_index, rcbits; - long int local = 0; - long int ret = H_SUCCESS; - struct revmap_entry *rev, *revs[4]; - - if (atomic_read(&kvm->online_vcpus) == 1) - local = 1; - for (i = 0; i < 4 && ret == H_SUCCESS; ) { - n = 0; - for (; i < 4; ++i) { - j = i * 2; - pte_index = args[j]; - flags = pte_index >> 56; - pte_index &= ((1ul << 56) - 1); - req = flags >> 6; - flags &= 3; - if (req == 3) { /* no more requests */ - i = 4; - break; - } - if (req != 1 || flags == 3 || pte_index >= HPT_NPTE) { - /* parameter error */ - args[j] = ((0xa0 | flags) << 56) + pte_index; - ret = H_PARAMETER; - break; - } - hp = (unsigned long *) - (kvm->arch.hpt_virt + (pte_index << 4)); - /* to avoid deadlock, don't spin except for first */ - if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) { - if (n) - break; - while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) - cpu_relax(); - } - found = 0; - if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) { - switch (flags & 3) { - case 0: /* absolute */ - found = 1; - break; - case 1: /* andcond */ - if (!(hp[0] & args[j + 1])) - found = 1; - break; - case 2: /* AVPN */ - if ((hp[0] & ~0x7fUL) == args[j + 1]) - found = 1; - break; - } - } - if (!found) { - hp[0] &= ~HPTE_V_HVLOCK; - args[j] = ((0x90 | flags) << 56) + pte_index; - continue; - } - - args[j] = ((0x80 | flags) << 56) + pte_index; - rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); - - if (!(hp[0] & HPTE_V_VALID)) { - /* insert R and C bits from PTE */ - rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); - args[j] |= rcbits << (56 - 5); - hp[0] = 0; - continue; - } - - hp[0] &= ~HPTE_V_VALID; /* leave it locked */ - tlbrb[n] = compute_tlbie_rb(hp[0], hp[1], pte_index); - indexes[n] = j; - hptes[n] = hp; - revs[n] = rev; - ++n; - } - - if (!n) - break; - - /* Now that we've collected a batch, do the tlbies */ - if (!local) { - while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile("ptesync" : : : "memory"); - for (k = 0; k < n; ++k) - asm volatile(PPC_TLBIE(%1,%0) : : - "r" (tlbrb[k]), - "r" (kvm->arch.lpid)); - asm volatile("eieio; tlbsync; ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; - } else { - asm volatile("ptesync" : : : "memory"); - for (k = 0; k < n; ++k) - asm volatile("tlbiel %0" : : "r" (tlbrb[k])); - asm volatile("ptesync" : : : "memory"); - } - - /* Read PTE low words after tlbie to get final R/C values */ - for (k = 0; k < n; ++k) { - j = indexes[k]; - pte_index = args[j] & ((1ul << 56) - 1); - hp = hptes[k]; - rev = revs[k]; - remove_revmap_chain(kvm, pte_index, rev, hp[0], hp[1]); - rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C); - args[j] |= rcbits << (56 - 5); - hp[0] = 0; - } - } - - return ret; -} - -long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, - unsigned long pte_index, unsigned long avpn, - unsigned long va) -{ - struct kvm *kvm = vcpu->kvm; - unsigned long *hpte; - struct revmap_entry *rev; - unsigned long v, r, rb, mask, bits; - - if (pte_index >= HPT_NPTE) - return H_PARAMETER; - - hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) - cpu_relax(); - if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || - ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) { - hpte[0] &= ~HPTE_V_HVLOCK; - return H_NOT_FOUND; - } - - if (atomic_read(&kvm->online_vcpus) == 1) - flags |= H_LOCAL; - v = hpte[0]; - bits = (flags << 55) & HPTE_R_PP0; - bits |= (flags << 48) & HPTE_R_KEY_HI; - bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); - - /* Update guest view of 2nd HPTE dword */ - mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | - HPTE_R_KEY_HI | HPTE_R_KEY_LO; - rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); - if (rev) { - r = (rev->guest_rpte & ~mask) | bits; - rev->guest_rpte = r; - } - r = (hpte[1] & ~mask) | bits; - - /* Update HPTE */ - if (v & HPTE_V_VALID) { - rb = compute_tlbie_rb(v, r, pte_index); - hpte[0] = v & ~HPTE_V_VALID; - if (!(flags & H_LOCAL)) { - while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile("ptesync" : : : "memory"); - asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" - : : "r" (rb), "r" (kvm->arch.lpid)); - asm volatile("ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; - } else { - asm volatile("ptesync" : : : "memory"); - asm volatile("tlbiel %0" : : "r" (rb)); - asm volatile("ptesync" : : : "memory"); - } - } - hpte[1] = r; - eieio(); - hpte[0] = v & ~HPTE_V_HVLOCK; - asm volatile("ptesync" : : : "memory"); - return H_SUCCESS; -} - -long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, - unsigned long pte_index) -{ - struct kvm *kvm = vcpu->kvm; - unsigned long *hpte, v, r; - int i, n = 1; - struct revmap_entry *rev = NULL; - - if (pte_index >= HPT_NPTE) - return H_PARAMETER; - if (flags & H_READ_4) { - pte_index &= ~3; - n = 4; - } - rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); - for (i = 0; i < n; ++i, ++pte_index) { - hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); - v = hpte[0] & ~HPTE_V_HVLOCK; - r = hpte[1]; - if (v & HPTE_V_ABSENT) { - v &= ~HPTE_V_ABSENT; - v |= HPTE_V_VALID; - } - if (v & HPTE_V_VALID) - r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C)); - vcpu->arch.gpr[4 + i * 2] = v; - vcpu->arch.gpr[5 + i * 2] = r; - } - return H_SUCCESS; -} - -void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep, - unsigned long pte_index) -{ - unsigned long rb; - - hptep[0] &= ~HPTE_V_VALID; - rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index); - while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile("ptesync" : : : "memory"); - asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" - : : "r" (rb), "r" (kvm->arch.lpid)); - asm volatile("ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; -} -EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte); - -void kvmppc_clear_ref_hpte(struct kvm *kvm, unsigned long *hptep, - unsigned long pte_index) -{ - unsigned long rb; - unsigned char rbyte; - - rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index); - rbyte = (hptep[1] & ~HPTE_R_R) >> 8; - /* modify only the second-last byte, which contains the ref bit */ - *((char *)hptep + 14) = rbyte; - while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) - cpu_relax(); - asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" - : : "r" (rb), "r" (kvm->arch.lpid)); - asm volatile("ptesync" : : : "memory"); - kvm->arch.tlbie_lock = 0; -} -EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte); - -static int slb_base_page_shift[4] = { - 24, /* 16M */ - 16, /* 64k */ - 34, /* 16G */ - 20, /* 1M, unsupported */ -}; - -long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v, - unsigned long valid) -{ - unsigned int i; - unsigned int pshift; - unsigned long somask; - unsigned long vsid, hash; - unsigned long avpn; - unsigned long *hpte; - unsigned long mask, val; - unsigned long v, r; - - /* Get page shift, work out hash and AVPN etc. */ - mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY; - val = 0; - pshift = 12; - if (slb_v & SLB_VSID_L) { - mask |= HPTE_V_LARGE; - val |= HPTE_V_LARGE; - pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4]; - } - if (slb_v & SLB_VSID_B_1T) { - somask = (1UL << 40) - 1; - vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T; - vsid ^= vsid << 25; - } else { - somask = (1UL << 28) - 1; - vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT; - } - hash = (vsid ^ ((eaddr & somask) >> pshift)) & HPT_HASH_MASK; - avpn = slb_v & ~(somask >> 16); /* also includes B */ - avpn |= (eaddr & somask) >> 16; - - if (pshift >= 24) - avpn &= ~((1UL << (pshift - 16)) - 1); - else - avpn &= ~0x7fUL; - val |= avpn; - - for (;;) { - hpte = (unsigned long *)(kvm->arch.hpt_virt + (hash << 7)); - - for (i = 0; i < 16; i += 2) { - /* Read the PTE racily */ - v = hpte[i] & ~HPTE_V_HVLOCK; - - /* Check valid/absent, hash, segment size and AVPN */ - if (!(v & valid) || (v & mask) != val) - continue; - - /* Lock the PTE and read it under the lock */ - while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK)) - cpu_relax(); - v = hpte[i] & ~HPTE_V_HVLOCK; - r = hpte[i+1]; - - /* - * Check the HPTE again, including large page size - * Since we don't currently allow any MPSS (mixed - * page-size segment) page sizes, it is sufficient - * to check against the actual page size. - */ - if ((v & valid) && (v & mask) == val && - hpte_page_size(v, r) == (1ul << pshift)) - /* Return with the HPTE still locked */ - return (hash << 3) + (i >> 1); - - /* Unlock and move on */ - hpte[i] = v; - } - - if (val & HPTE_V_SECONDARY) - break; - val |= HPTE_V_SECONDARY; - hash = hash ^ HPT_HASH_MASK; - } - return -1; -} -EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); - -/* - * Called in real mode to check whether an HPTE not found fault - * is due to accessing a paged-out page or an emulated MMIO page, - * or if a protection fault is due to accessing a page that the - * guest wanted read/write access to but which we made read-only. - * Returns a possibly modified status (DSISR) value if not - * (i.e. pass the interrupt to the guest), - * -1 to pass the fault up to host kernel mode code, -2 to do that - * and also load the instruction word (for MMIO emulation), - * or 0 if we should make the guest retry the access. - */ -long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, - unsigned long slb_v, unsigned int status, bool data) -{ - struct kvm *kvm = vcpu->kvm; - long int index; - unsigned long v, r, gr; - unsigned long *hpte; - unsigned long valid; - struct revmap_entry *rev; - unsigned long pp, key; - - /* For protection fault, expect to find a valid HPTE */ - valid = HPTE_V_VALID; - if (status & DSISR_NOHPTE) - valid |= HPTE_V_ABSENT; - - index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); - if (index < 0) { - if (status & DSISR_NOHPTE) - return status; /* there really was no HPTE */ - return 0; /* for prot fault, HPTE disappeared */ - } - hpte = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); - v = hpte[0] & ~HPTE_V_HVLOCK; - r = hpte[1]; - rev = real_vmalloc_addr(&kvm->arch.revmap[index]); - gr = rev->guest_rpte; - - unlock_hpte(hpte, v); - - /* For not found, if the HPTE is valid by now, retry the instruction */ - if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID)) - return 0; - - /* Check access permissions to the page */ - pp = gr & (HPTE_R_PP0 | HPTE_R_PP); - key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; - status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */ - if (!data) { - if (gr & (HPTE_R_N | HPTE_R_G)) - return status | SRR1_ISI_N_OR_G; - if (!hpte_read_permission(pp, slb_v & key)) - return status | SRR1_ISI_PROT; - } else if (status & DSISR_ISSTORE) { - /* check write permission */ - if (!hpte_write_permission(pp, slb_v & key)) - return status | DSISR_PROTFAULT; - } else { - if (!hpte_read_permission(pp, slb_v & key)) - return status | DSISR_PROTFAULT; - } - - /* Check storage key, if applicable */ - if (data && (vcpu->arch.shregs.msr & MSR_DR)) { - unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr); - if (status & DSISR_ISSTORE) - perm >>= 1; - if (perm & 1) - return status | DSISR_KEYFAULT; - } - - /* Save HPTE info for virtual-mode handler */ - vcpu->arch.pgfault_addr = addr; - vcpu->arch.pgfault_index = index; - vcpu->arch.pgfault_hpte[0] = v; - vcpu->arch.pgfault_hpte[1] = r; - - /* Check the storage key to see if it is possibly emulated MMIO */ - if (data && (vcpu->arch.shregs.msr & MSR_IR) && - (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) == - (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) - return -2; /* MMIO emulation - load instr word */ - - return -1; /* send fault up to host kernel mode */ -} |