[patch 6/6] KVM: MMU audit: largepage handling

Marcelo Tosatti
2009-06-10T15:31:23Z

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Make the audit code aware of largepages.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm/arch/x86/kvm/mmu.c
===================================================================
--- kvm.orig/arch/x86/kvm/mmu.c
+++ kvm/arch/x86/kvm/mmu.c
@@ -3033,12 +3033,11 @@ static void __mmu_spte_walk(struct kvm *
u64 ent = sp->spt[i];

if (is_shadow_present_pte(ent)) {
- if (sp->role.level > 1 && !is_large_pte(ent)) {
+ if (!is_last_spte(ent, sp->role.level)) {
struct kvm_mmu_page *child;
child = page_header(ent & PT64_BASE_ADDR_MASK);
__mmu_spte_walk(kvm, child, fn);
- }
- if (sp->role.level == 1)
+ } else
fn(kvm, sp, &sp->spt[i]);
}
}
@@ -3083,10 +3082,9 @@ static void audit_mappings_page(struct k
continue;

va = canonicalize(va);
- if (level > 1) {
- if (is_shadow_present_pte(ent))
- audit_mappings_page(vcpu, ent, va, level - 1);
- } else {
+ if (is_shadow_present_pte(ent) && !is_last_spte(ent, level))
+ audit_mappings_page(vcpu, ent, va, level - 1);
+ else {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, va);
gfn_t gfn = gpa >> PAGE_SHIFT;
pfn_t pfn = gfn_to_pfn(vcpu->kvm, gfn);
@@ -3183,7 +3181,8 @@ void inspect_spte_has_rmap(struct kvm *k
return;
}

- rmapp = gfn_to_rmap(kvm, rev_sp->gfns[sptep - rev_sp->spt], 0);
+ rmapp = gfn_to_rmap(kvm, rev_sp->gfns[sptep - rev_sp->spt],
+ is_large_pte(*sptep));
if (!*rmapp) {
if (!printk_ratelimit())
return;

--