From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 414D0C04EBF for ; Mon, 3 Dec 2018 13:10:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0708D20878 for ; Mon, 3 Dec 2018 13:10:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0708D20878 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726032AbeLCNLP (ORCPT ); Mon, 3 Dec 2018 08:11:15 -0500 Received: from mx1.redhat.com ([209.132.183.28]:37156 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725830AbeLCNLP (ORCPT ); Mon, 3 Dec 2018 08:11:15 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 87C66C04AC58; Mon, 3 Dec 2018 13:10:16 +0000 (UTC) Received: from [10.36.118.125] (unknown [10.36.118.125]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2F172272C6; Mon, 3 Dec 2018 13:10:14 +0000 (UTC) Subject: Re: [PATCH v4 03/14] X86/nVMX: Update the PML table without mapping and unmapping the page To: KarimAllah Ahmed , rkrcmar@redhat.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, jmattson@google.com References: <1543829467-18025-1-git-send-email-karahmed@amazon.de> <1543829467-18025-4-git-send-email-karahmed@amazon.de> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <1543829467-18025-4-git-send-email-karahmed@amazon.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 03 Dec 2018 13:10:16 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03.12.18 10:30, KarimAllah Ahmed wrote: > Update the PML table without mapping and unmapping the page. This also > avoids using kvm_vcpu_gpa_to_page(..) which assumes that there is a "struct > page" for guest memory. > > Signed-off-by: KarimAllah Ahmed > --- > v1 -> v2: > - Use kvm_write_guest_page instead of kvm_write_guest (pbonzini) > - Do not use pointer arithmetic for pml_address (pbonzini) > --- > arch/x86/kvm/vmx.c | 14 +++++--------- > 1 file changed, 5 insertions(+), 9 deletions(-) > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c > index 75817cb..6d6dfa9 100644 > --- a/arch/x86/kvm/vmx.c > +++ b/arch/x86/kvm/vmx.c > @@ -14427,9 +14427,7 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu) > { > struct vmcs12 *vmcs12; > struct vcpu_vmx *vmx = to_vmx(vcpu); > - gpa_t gpa; > - struct page *page = NULL; > - u64 *pml_address; > + gpa_t gpa, dst; > > if (is_guest_mode(vcpu)) { > WARN_ON_ONCE(vmx->nested.pml_full); > @@ -14449,15 +14447,13 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu) > } > > gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS) & ~0xFFFull; > + dst = vmcs12->pml_address + sizeof(u64) * vmcs12->guest_pml_index; > > - page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->pml_address); > - if (is_error_page(page)) > + if (kvm_write_guest_page(vcpu->kvm, gpa_to_gfn(dst), &gpa, > + offset_in_page(dst), sizeof(gpa))) > return 0; > > - pml_address = kmap(page); > - pml_address[vmcs12->guest_pml_index--] = gpa; > - kunmap(page); > - kvm_release_page_clean(page); So we've written to the page but released it as clean ... shouldn't that have been kvm_release_page_dirty? ... also, shouldn't there have been a mark_page_dirty() ? (to mark it dirty for migration?) Your patch certainly fixes both conditions (if it was in fact broken). In that case, we should maybe add that to the cover letter. Reviewed-by: David Hildenbrand > + vmcs12->guest_pml_index--; > } > > return 0; > -- Thanks, David / dhildenb