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=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,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 21A61C33CB2 for ; Tue, 14 Jan 2020 10:17:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 00AB520678 for ; Tue, 14 Jan 2020 10:17:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732280AbgANKRB (ORCPT ); Tue, 14 Jan 2020 05:17:01 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:42305 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729472AbgANKQ4 (ORCPT ); Tue, 14 Jan 2020 05:16:56 -0500 Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1irJFk-0007f7-F3; Tue, 14 Jan 2020 11:16:52 +0100 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id 1FCCB1C001A; Tue, 14 Jan 2020 11:16:52 +0100 (CET) Date: Tue, 14 Jan 2020 10:16:51 -0000 From: "tip-bot2 for Sean Christopherson" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/cpu] KVM: VMX: Use VMX feature flag to query BIOS enabling Cc: Sean Christopherson , Borislav Petkov , x86 , LKML In-Reply-To: <20191221044513.21680-16-sean.j.christopherson@intel.com> References: <20191221044513.21680-16-sean.j.christopherson@intel.com> MIME-Version: 1.0 Message-ID: <157899701188.1022.3670681480292304801.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/cpu branch of tip: Commit-ID: a4d0b2fdbcf75ef6654713c83c316ea3a661ddc3 Gitweb: https://git.kernel.org/tip/a4d0b2fdbcf75ef6654713c83c316ea3a661ddc3 Author: Sean Christopherson AuthorDate: Fri, 20 Dec 2019 20:45:09 -08:00 Committer: Borislav Petkov CommitterDate: Mon, 13 Jan 2020 19:19:32 +01:00 KVM: VMX: Use VMX feature flag to query BIOS enabling Replace KVM's manual checks on IA32_FEAT_CTL with a query on the boot CPU's MSR_IA32_FEAT_CTL and VMX feature flags. The MSR_IA32_FEAT_CTL indicates that IA32_FEAT_CTL has been configured and that dependent features are accurately reflected in cpufeatures, e.g. the VMX flag is now cleared during boot if VMX isn't fully enabled via IA32_FEAT_CTL, including the case where the MSR isn't supported. Signed-off-by: Sean Christopherson Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20191221044513.21680-16-sean.j.christopherson@intel.com --- arch/x86/kvm/vmx/vmx.c | 27 ++------------------------- 1 file changed, 2 insertions(+), 25 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index a026334..06e0e52 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2204,31 +2204,8 @@ static __init int cpu_has_kvm_support(void) static __init int vmx_disabled_by_bios(void) { - u64 msr; - - rdmsrl(MSR_IA32_FEAT_CTL, msr); - - if (unlikely(!(msr & FEAT_CTL_LOCKED))) - return 1; - - /* launched w/ TXT and VMX disabled */ - if (!(msr & FEAT_CTL_VMX_ENABLED_INSIDE_SMX) && - tboot_enabled()) - return 1; - /* launched w/o TXT and VMX only enabled w/ TXT */ - if (!(msr & FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX) && - (msr & FEAT_CTL_VMX_ENABLED_INSIDE_SMX) && - !tboot_enabled()) { - pr_warn("kvm: disable TXT in the BIOS or " - "activate TXT before enabling KVM\n"); - return 1; - } - /* launched w/o TXT and VMX disabled */ - if (!(msr & FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX) && - !tboot_enabled()) - return 1; - - return 0; + return !boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || + !boot_cpu_has(X86_FEATURE_VMX); } static void kvm_cpu_vmxon(u64 addr)