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KVM: MMU: clear apfs if page state is changed

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If CR0.PG is changed, the page fault cann't be avoid when the prefault address
is accessed later

And it also fix a bug: it can retry a page enabled #PF in page disabled context
if mmu is shadow page

This idear is from Gleb Natapov

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-11-12 14:47:01 +08:00 committed by Avi Kivity
parent 5054c0de66
commit e5f3f02796
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/x86.c
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@ -520,6 +520,9 @@ int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
kvm_x86_ops->set_cr0(vcpu, cr0);
if ((cr0 ^ old_cr0) & X86_CR0_PG)
kvm_clear_async_pf_completion_queue(vcpu);
if ((cr0 ^ old_cr0) & update_bits)
kvm_mmu_reset_context(vcpu);
return 0;