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KVM: MMU: Don't treat a global pte as such if cr4.pge is cleared

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The pte.g bit is meaningless if global pages are disabled; deferring
mmu page synchronization on these ptes will lead to the guest using stale
shadow ptes.

Fixes Vista x86 smp bootloader failure.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2008-12-21 18:31:10 +02:00
parent fe634fd46f
commit 25e2343246
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/mmu.c
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@ -1669,6 +1669,8 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
u64 mt_mask = shadow_mt_mask; u64 mt_mask = shadow_mt_mask;
struct kvm_mmu_page *sp = page_header(__pa(shadow_pte)); struct kvm_mmu_page *sp = page_header(__pa(shadow_pte));
if (!(vcpu->arch.cr4 & X86_CR4_PGE))
global = 0;
if (!global && sp->global) { if (!global && sp->global) {
sp->global = 0; sp->global = 0;
if (sp->unsync) { if (sp->unsync) {