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 A163EC04EB9 for ; Mon, 3 Dec 2018 12:49:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 601FB2145D for ; Mon, 3 Dec 2018 12:49:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 601FB2145D 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 S1726545AbeLCMt4 (ORCPT ); Mon, 3 Dec 2018 07:49:56 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60790 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726347AbeLCMt4 (ORCPT ); Mon, 3 Dec 2018 07:49:56 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5996C308339C; Mon, 3 Dec 2018 12:49:01 +0000 (UTC) Received: from [10.36.118.125] (unknown [10.36.118.125]) by smtp.corp.redhat.com (Postfix) with ESMTP id DF6A0100194B; Mon, 3 Dec 2018 12:48:59 +0000 (UTC) Subject: Re: [PATCH v4 01/14] X86/nVMX: handle_vmon: Read 4 bytes from guest memory 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> <1543829467-18025-2-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: <1543829467-18025-2-git-send-email-karahmed@amazon.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Mon, 03 Dec 2018 12:49:01 +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: > Read the data directly from guest memory instead of the map->read->unmap > sequence. This also avoids using kvm_vcpu_gpa_to_page() and kmap() which > assumes that there is a "struct page" for guest memory. > > Suggested-by: Jim Mattson > Signed-off-by: KarimAllah Ahmed > Reviewed-by: Jim Mattson > > --- > v1 -> v2: > - Massage commit message a bit. > --- > arch/x86/kvm/vmx.c | 14 +++----------- > 1 file changed, 3 insertions(+), 11 deletions(-) > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c > index 02edd99..b84f230 100644 > --- a/arch/x86/kvm/vmx.c > +++ b/arch/x86/kvm/vmx.c > @@ -8358,7 +8358,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu) > { > int ret; > gpa_t vmptr; > - struct page *page; > + uint32_t revision; > struct vcpu_vmx *vmx = to_vmx(vcpu); > const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED > | FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; > @@ -8407,18 +8407,10 @@ static int handle_vmon(struct kvm_vcpu *vcpu) > if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu))) > return nested_vmx_failInvalid(vcpu); > > - page = kvm_vcpu_gpa_to_page(vcpu, vmptr); > - if (is_error_page(page)) > + if (kvm_read_guest(vcpu->kvm, vmptr, &revision, sizeof(revision)) || > + revision != VMCS12_REVISION) > return nested_vmx_failInvalid(vcpu); > > - if (*(u32 *)kmap(page) != VMCS12_REVISION) { > - kunmap(page); > - kvm_release_page_clean(page); > - return nested_vmx_failInvalid(vcpu); > - } > - kunmap(page); > - kvm_release_page_clean(page); > - > vmx->nested.vmxon_ptr = vmptr; > ret = enter_vmx_operation(vcpu); > if (ret) > Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb