diff options
| author | Izik Eidus <ieidus@redhat.com> | 2008-10-03 17:40:32 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2008-12-31 16:51:50 +0200 |
| commit | 2843099fee32a6020e1caa95c6026f28b5d43bff (patch) | |
| tree | 774ddfeec4091adddf9bd9ce938648dad14c378e /arch | |
| parent | 6eb55818c043b097c83828da8430fcb9a02fdb89 (diff) | |
KVM: MMU: Fix aliased gfns treated as unaliased
Some areas of kvm x86 mmu are using gfn offset inside a slot without
unaliasing the gfn first. This patch makes sure that the gfn will be
unaliased and add gfn_to_memslot_unaliased() to save the calculating
of the gfn unaliasing in case we have it unaliased already.
Signed-off-by: Izik Eidus <ieidus@redhat.com>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/mmu.c | 14 |
2 files changed, 12 insertions, 4 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 09e6c56572cb..99e3cc149d21 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -617,6 +617,8 @@ void kvm_disable_tdp(void); int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3); int complete_pio(struct kvm_vcpu *vcpu); +struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn); + static inline struct kvm_mmu_page *page_header(hpa_t shadow_page) { struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT); diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 8687758b5295..8904e8ada978 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -386,7 +386,9 @@ static void account_shadowed(struct kvm *kvm, gfn_t gfn) { int *write_count; - write_count = slot_largepage_idx(gfn, gfn_to_memslot(kvm, gfn)); + gfn = unalias_gfn(kvm, gfn); + write_count = slot_largepage_idx(gfn, + gfn_to_memslot_unaliased(kvm, gfn)); *write_count += 1; } @@ -394,16 +396,20 @@ static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) { int *write_count; - write_count = slot_largepage_idx(gfn, gfn_to_memslot(kvm, gfn)); + gfn = unalias_gfn(kvm, gfn); + write_count = slot_largepage_idx(gfn, + gfn_to_memslot_unaliased(kvm, gfn)); *write_count -= 1; WARN_ON(*write_count < 0); } static int has_wrprotected_page(struct kvm *kvm, gfn_t gfn) { - struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); + struct kvm_memory_slot *slot; int *largepage_idx; + gfn = unalias_gfn(kvm, gfn); + slot = gfn_to_memslot_unaliased(kvm, gfn); if (slot) { largepage_idx = slot_largepage_idx(gfn, slot); return *largepage_idx; @@ -2973,8 +2979,8 @@ static void audit_write_protection(struct kvm_vcpu *vcpu) if (sp->role.metaphysical) continue; - slot = gfn_to_memslot(vcpu->kvm, sp->gfn); gfn = unalias_gfn(vcpu->kvm, sp->gfn); + slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->gfn); rmapp = &slot->rmap[gfn - slot->base_gfn]; if (*rmapp) printk(KERN_ERR "%s: (%s) shadow page has writable" |