Messages in this thread Patch in this message | | | Date | Fri, 12 Nov 2010 14:47:01 +0800 | From | Xiao Guangrong <> | Subject | [PATCH v2 2/5] 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> --- arch/x86/kvm/x86.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index fc29223..c071d73 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -525,6 +525,9 @@ 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; -- 1.7.0.4
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