From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: Re: [PATCH] KVM: MMU: avoid fast page fault fixing mmio page fault Date: Thu, 18 Jul 2013 12:55:45 +0800 Message-ID: <51E77551.7040408@linux.vnet.ibm.com> References: <1374123157-11142-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: gleb@redhat.com, markus@trippelsdorf.de, mtosatti@redhat.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org To: Xiao Guangrong Return-path: In-Reply-To: <1374123157-11142-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 07/18/2013 12:52 PM, Xiao Guangrong wrote: > Currently, fast page fault tries to fix mmio page fault when the > generation number is invalid (spte.gen != kvm.gen) and returns to > guest to retry the fault since it sees the last spte is nonpresent > which causes infinity loop > > It can be triggered only on AMD host since the mmio page fault is > recognized as ept-misconfig Sorry, It should be "recognized as ept-misconfig on Intel host."