From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936001Ab0COJXQ (ORCPT ); Mon, 15 Mar 2010 05:23:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:24581 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935892Ab0COJXP (ORCPT ); Mon, 15 Mar 2010 05:23:15 -0400 Message-ID: <4B9DFC7B.5050900@redhat.com> Date: Mon, 15 Mar 2010 11:23:07 +0200 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 MIME-Version: 1.0 To: Joerg Roedel CC: Joerg Roedel , Marcelo Tosatti , Alexander Graf , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 15/18] KVM: MMU: Propagate the right fault back to the guest after gva_to_gpa References: <1267643541-451-1-git-send-email-joerg.roedel@amd.com> <1267643541-451-16-git-send-email-joerg.roedel@amd.com> <4B9DE394.2080401@redhat.com> <20100315090609.GA13108@8bytes.org> In-Reply-To: <20100315090609.GA13108@8bytes.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/15/2010 11:06 AM, Joerg Roedel wrote: > On Mon, Mar 15, 2010 at 09:36:52AM +0200, Avi Kivity wrote: > >> On 03/03/2010 09:12 PM, Joerg Roedel wrote: >> >>> This patch implements logic to make sure that either a >>> page-fault/page-fault-vmexit or a nested-page-fault-vmexit >>> is propagated back to the guest. >>> >>> Signed-off-by: Joerg Roedel >>> --- >>> arch/x86/kvm/mmu.h | 1 + >>> arch/x86/kvm/paging_tmpl.h | 2 ++ >>> arch/x86/kvm/x86.c | 15 ++++++++++++++- >>> 3 files changed, 17 insertions(+), 1 deletions(-) >>> >>> diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h >>> index 64f619b..b42b27e 100644 >>> --- a/arch/x86/kvm/mmu.h >>> +++ b/arch/x86/kvm/mmu.h >>> @@ -47,6 +47,7 @@ >>> #define PFERR_USER_MASK (1U<< 2) >>> #define PFERR_RSVD_MASK (1U<< 3) >>> #define PFERR_FETCH_MASK (1U<< 4) >>> +#define PFERR_NESTED_MASK (1U<< 31) >>> >>> >> >> Why is this needed? Queue an ordinary page fault page; the injection >> code should check the page fault intercept and #VMEXIT if needed. >> > This is needed because we could have a nested page fault or an ordinary > page fault which need to be propagated. > Right. Why is pio_copy_data() changed? One would think that it would be an all-or-nothing affair. -- error compiling committee.c: too many arguments to function