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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 0BA57C169C4 for ; Thu, 31 Jan 2019 20:28:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C9B6D21939 for ; Thu, 31 Jan 2019 20:28:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b="LhylDaW2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727986AbfAaU1B (ORCPT ); Thu, 31 Jan 2019 15:27:01 -0500 Received: from smtp-fw-9101.amazon.com ([207.171.184.25]:11820 "EHLO smtp-fw-9101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727779AbfAaU05 (ORCPT ); Thu, 31 Jan 2019 15:26:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.de; i=@amazon.de; q=dns/txt; s=amazon201209; t=1548966416; x=1580502416; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=f9uDHmL2VR9YxEOmcnUkqCx0VWRQBeZ8FR9P+ZAbcIw=; b=LhylDaW2g/JHAo/io9VhJfDHyBoR0PE1n3IgStJsWIKiKhVyxliT1Tn4 8KadWiewnM9cSS6z1mVqqF3qNupCYdGf6cWo1wnyaG+d4WS/iI3xiysLt SDoMEDM+iFWtDDVVLjrymltMJ1X79ic24GLIj8okzmzHnJyrjeaXg/FPu 0=; X-IronPort-AV: E=Sophos;i="5.56,545,1539648000"; d="scan'208";a="784846688" Received: from sea3-co-svc-lb6-vlan3.sea.amazon.com (HELO email-inbound-relay-1a-e34f1ddc.us-east-1.amazon.com) ([10.47.22.38]) by smtp-border-fw-out-9101.sea19.amazon.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 31 Jan 2019 20:26:53 +0000 Received: from u54e1ad5160425a4b64ea.ant.amazon.com (iad7-ws-svc-lb50-vlan2.amazon.com [10.0.93.210]) by email-inbound-relay-1a-e34f1ddc.us-east-1.amazon.com (8.14.7/8.14.7) with ESMTP id x0VKQkMt014462 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 31 Jan 2019 20:26:49 GMT Received: from u54e1ad5160425a4b64ea.ant.amazon.com (localhost [127.0.0.1]) by u54e1ad5160425a4b64ea.ant.amazon.com (8.15.2/8.15.2/Debian-3) with ESMTP id x0VKQiFY028884; Thu, 31 Jan 2019 21:26:45 +0100 Received: (from karahmed@localhost) by u54e1ad5160425a4b64ea.ant.amazon.com (8.15.2/8.15.2/Submit) id x0VKQiFq028883; Thu, 31 Jan 2019 21:26:44 +0100 From: KarimAllah Ahmed To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Paolo Bonzini Cc: KarimAllah Ahmed Subject: [PATCH v6 01/14] X86/nVMX: handle_vmon: Read 4 bytes from guest memory Date: Thu, 31 Jan 2019 21:24:31 +0100 Message-Id: <1548966284-28642-2-git-send-email-karahmed@amazon.de> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1548966284-28642-1-git-send-email-karahmed@amazon.de> References: <1548966284-28642-1-git-send-email-karahmed@amazon.de> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reviewed-by: David Hildenbrand Reviewed-by: Konrad Rzeszutek Wilk --- v1 -> v2: - Massage commit message a bit. --- arch/x86/kvm/vmx/nested.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 8ff2052..11b44a9 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4192,7 +4192,7 @@ 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; @@ -4241,18 +4241,10 @@ 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) -- 2.7.4