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KVM: MMU audit: update audit_write_protection

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- Unsync pages contain writable sptes in the rmap.
- rmaps do not exclusively contain writable sptes anymore.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-06-10 12:27:05 -03:00 committed by Avi Kivity
parent 08a3732bf2
commit e58b0f9e0e
1 changed files with 11 additions and 3 deletions
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14
arch/x86/kvm/mmu.c
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@ -3260,20 +3260,28 @@ static void audit_write_protection(struct kvm_vcpu *vcpu)
struct kvm_mmu_page *sp; struct kvm_mmu_page *sp;
struct kvm_memory_slot *slot; struct kvm_memory_slot *slot;
unsigned long *rmapp; unsigned long *rmapp;
u64 *spte;
gfn_t gfn; gfn_t gfn;
list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) { list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
if (sp->role.direct) if (sp->role.direct)
continue; continue;
if (sp->unsync)
continue;
gfn = unalias_gfn(vcpu->kvm, sp->gfn); gfn = unalias_gfn(vcpu->kvm, sp->gfn);
slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->gfn); slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->gfn);
rmapp = &slot->rmap[gfn - slot->base_gfn]; rmapp = &slot->rmap[gfn - slot->base_gfn];
if (*rmapp)
printk(KERN_ERR "%s: (%s) shadow page has writable" spte = rmap_next(vcpu->kvm, rmapp, NULL);
" mappings: gfn %lx role %x\n", while (spte) {
if (*spte & PT_WRITABLE_MASK)
printk(KERN_ERR "%s: (%s) shadow page has "
"writable mappings: gfn %lx role %x\n",
__func__, audit_msg, sp->gfn, __func__, audit_msg, sp->gfn,
sp->role.word); sp->role.word);
spte = rmap_next(vcpu->kvm, rmapp, spte);
}
} }
} }