From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH v2 2/5] KVM: MMU: clear apfs if page state is changed Date: Fri, 12 Nov 2010 14:47:01 +0800 Message-ID: <4CDCE2E5.6000401@cn.fujitsu.com> References: <4CDCE2B0.7000601@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , Gleb Natapov , LKML , KVM To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:58754 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1750936Ab0KLGms (ORCPT ); Fri, 12 Nov 2010 01:42:48 -0500 In-Reply-To: <4CDCE2B0.7000601@cn.fujitsu.com> Sender: kvm-owner@vger.kernel.org List-ID: 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 --- 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