From bc32ce2152406431acf4daf4a81dc1664bb7b91b Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Sat, 28 Aug 2010 19:22:46 +0800 Subject: [PATCH] KVM: MMU: fix wrong not write protected sp report 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 Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 5 +++-- arch/x86/kvm/paging_tmpl.h | 3 ++- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 1c784b96dac3..68575dc32ec7 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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) { diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index a4e8389df2ad..a0f2febf5692 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -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); -- 2.20.1