kvm_mmu_pte_write() does not handle 32-bit non-PAE large page backed
guests properly. It will instantiate two 2MB sptes pointing to the same
physical 2MB page when a guest large pte update is trapped.
Instead of duplicating code to handle this, disallow directory level
updates to happen through kvm_mmu_pte_write(), so the two 2MB sptes
emulating one guest 4MB pte can be correctly created by the page fault
handling path.
Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c5def36..3ee3a6c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1586,11 +1587,13 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
u64 *spte,
const void *new)
{
- if ((sp->role.level != PT_PAGE_TABLE_LEVEL)
- && !vcpu->arch.update_pte.largepage) {
- ++vcpu->kvm->stat.mmu_pde_zapped;
- return;
- }
+ if (sp->role.level != PT_PAGE_TABLE_LEVEL) {
+ if (!vcpu->arch.update_pte.largepage ||
+ sp->role.glevels == PT32_ROOT_LEVEL) {
+ ++vcpu->kvm->stat.mmu_pde_zapped;
+ return;
+ }
+ }
++vcpu->kvm->stat.mmu_pte_updated;
if (sp->role.glevels == PT32_ROOT_LEVEL)
--
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