From 2aaf65e8c40468b198b709a765abe311f91c1a1d Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Wed, 10 Jun 2009 12:27:07 -0300 Subject: [PATCH] KVM: MMU audit: audit_mappings tweaks - Fail early in case gfn_to_pfn returns is_error_pfn. - For the pre pte write case, avoid spurious "gva is valid but spte is notrap" messages (the emulation code does the guest write first, so this particular case is OK). Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 8643351..50fe854 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -3117,6 +3117,11 @@ static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte, pfn_t pfn = gfn_to_pfn(vcpu->kvm, gfn); hpa_t hpa = (hpa_t)pfn << PAGE_SHIFT; + if (is_error_pfn(pfn)) { + kvm_release_pfn_clean(pfn); + continue; + } + if (is_shadow_present_pte(ent) && (ent & PT64_BASE_ADDR_MASK) != hpa) printk(KERN_ERR "xx audit error: (%s) levels %d" @@ -3288,7 +3293,8 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) audit_msg = msg; audit_rmap(vcpu); audit_write_protection(vcpu); - audit_mappings(vcpu); + if (strcmp("pre pte write", audit_msg) != 0) + audit_mappings(vcpu); audit_writable_sptes_have_rmaps(vcpu); dbg = olddbg; } -- 2.7.4