提交 30945387 编写于 作者: M Marcelo Tosatti 提交者: Avi Kivity

KVM: MMU: large page update_pte issue with non-PAE 32-bit guests (resend)

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: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NAvi Kivity <avi@qumranet.com>
上级 6597ca09
...@@ -1581,11 +1581,13 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, ...@@ -1581,11 +1581,13 @@ static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
u64 *spte, u64 *spte,
const void *new) const void *new)
{ {
if ((sp->role.level != PT_PAGE_TABLE_LEVEL) if (sp->role.level != PT_PAGE_TABLE_LEVEL) {
&& !vcpu->arch.update_pte.largepage) { if (!vcpu->arch.update_pte.largepage ||
++vcpu->kvm->stat.mmu_pde_zapped; sp->role.glevels == PT32_ROOT_LEVEL) {
return; ++vcpu->kvm->stat.mmu_pde_zapped;
} return;
}
}
++vcpu->kvm->stat.mmu_pte_updated; ++vcpu->kvm->stat.mmu_pte_updated;
if (sp->role.glevels == PT32_ROOT_LEVEL) if (sp->role.glevels == PT32_ROOT_LEVEL)
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册