From mboxrd@z Thu Jan 1 00:00:00 1970 From: Huang Ying Subject: Re: [PATCH -v2] Monitor command: pfa2hva, translate guest physical address to host virtual address Date: Wed, 10 Nov 2010 15:41:52 +0800 Message-ID: <1289374912.8719.65.camel@yhuang-dev> References: <1288060789.2862.336.camel@yhuang-dev> <20101101160952.GE1429@amt.cnet> <4CCF0BAB.9000304@linux.vnet.ibm.com> <1288639205.2059.34.camel@yhuang-mobile> <4CCF136D.5080307@linux.vnet.ibm.com> <4CD58121.2040209@redhat.com> <1289179768.3532.3.camel@yhuang-dev> <4CD770E5.9000105@linux.vnet.ibm.com> <4CDA421C.2040308@redhat.com> <4CDA42B4.5060201@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Anthony Liguori , Marcelo Tosatti , Anthony Liguori , "kvm@vger.kernel.org" , Andi Kleen , Dean Nelson , Luiz Capitulino To: Avi Kivity Return-path: Received: from mga09.intel.com ([134.134.136.24]:53014 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753313Ab0KJHl4 (ORCPT ); Wed, 10 Nov 2010 02:41:56 -0500 In-Reply-To: <4CDA42B4.5060201@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Wed, 2010-11-10 at 14:59 +0800, Avi Kivity wrote: > On 11/10/2010 08:56 AM, Avi Kivity wrote: > > On 11/08/2010 05:39 AM, Anthony Liguori wrote: > >>> Yes. The main usage of the interface is automated testing. > >> > >> That's precisely what the command should not be used for. > >> > >> You can't assume a gpa -> hva mapping is consistent in an external > >> application. If you want to implement an interface for testing, you > >> have to push more of the logic into QEMU to avoid the race. > > > > An alternative is to use -mempath. Does poisoning work for tmpfs? > > > Or hugetlbfs - I think it does? The QEMU support for hugetlbfs has some issues now. Because it is hard for QEMU to deal with 2M poisoned page reported by host OS. Although it is possible for QEMU to relay 2M poisoned page as MCE to guest OS, the guest OS may not work properly for this kind of MCE. Best Regards, Huang Ying