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KVM: MMU: fix wrong not write protected sp report

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The audit code reports some sp not write protected in current code, it's just the
bug in audit_write_protection(), since:

- the invalid sp not need write protected
- using uninitialize local variable('gfn')
- call kvm_mmu_audit() out of mmu_lock's protection

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-08-28 19:22:46 +08:00 committed by Avi Kivity
parent 0beb8d6604
commit bc32ce2152
2 changed files with 5 additions and 3 deletions
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5
arch/x86/kvm/mmu.c
View file

@ -3708,16 +3708,17 @@ static void audit_write_protection(struct kvm_vcpu *vcpu)
struct kvm_memory_slot *slot;
unsigned long *rmapp;
u64 *spte;
gfn_t gfn;
list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
if (sp->role.direct)
continue;
if (sp->unsync)
continue;
if (sp->role.invalid)
continue;
slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
rmapp = &slot->rmap[gfn - slot->base_gfn];
rmapp = &slot->rmap[sp->gfn - slot->base_gfn];
spte = rmap_next(vcpu->kvm, rmapp, NULL);
while (spte) {

3
arch/x86/kvm/paging_tmpl.h
View file

@ -504,7 +504,6 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
unsigned long mmu_seq;
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
kvm_mmu_audit(vcpu, "pre page fault");
r = mmu_topup_memory_caches(vcpu);
if (r)
@ -542,6 +541,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
spin_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu, mmu_seq))
goto out_unlock;
kvm_mmu_audit(vcpu, "pre page fault");
kvm_mmu_free_some_pages(vcpu);
sptep = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
level, &write_pt, pfn);