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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,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 7DC57CA9EAF for ; Tue, 22 Oct 2019 00:08:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5A5FB20656 for ; Tue, 22 Oct 2019 00:08:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387502AbfJVAIf (ORCPT ); Mon, 21 Oct 2019 20:08:35 -0400 Received: from mga05.intel.com ([192.55.52.43]:7797 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387479AbfJVAIe (ORCPT ); Mon, 21 Oct 2019 20:08:34 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Oct 2019 17:08:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,325,1566889200"; d="scan'208";a="196274537" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.41]) by fmsmga008.fm.intel.com with ESMTP; 21 Oct 2019 17:08:33 -0700 From: Sean Christopherson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org Cc: "H. Peter Anvin" , linux-kernel@vger.kernel.org, Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , kvm@vger.kernel.org, Sean Christopherson Subject: [PATCH v2 05/16] KVM: VMX: Drop initialization of IA32_FEATURE_CONTROL MSR Date: Mon, 21 Oct 2019 17:08:20 -0700 Message-Id: <20191022000820.1854-1-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20191021234632.32363-1-sean.j.christopherson@intel.com> References: <20191021234632.32363-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Remove the code to initialize IA32_FEATURE_CONTROL MSR when KVM is loaded now that the MSR is initialized during boot on all CPUs that support VMX, i.e. can possibly load kvm_intel. Reviewed-by: Jim Mattson Signed-off-by: Sean Christopherson --- arch/x86/kvm/vmx/vmx.c | 48 +++++++++++++++++------------------------- 1 file changed, 19 insertions(+), 29 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index d4575ffb3cec..23c9e4b91b31 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2192,24 +2192,26 @@ static __init int vmx_disabled_by_bios(void) u64 msr; rdmsrl(MSR_IA32_FEATURE_CONTROL, msr); - if (msr & FEATURE_CONTROL_LOCKED) { - /* launched w/ TXT and VMX disabled */ - if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) - && tboot_enabled()) - return 1; - /* launched w/o TXT and VMX only enabled w/ TXT */ - if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) - && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) - && !tboot_enabled()) { - printk(KERN_WARNING "kvm: disable TXT in the BIOS or " - "activate TXT before enabling KVM\n"); - return 1; - } - /* launched w/o TXT and VMX disabled */ - if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) - && !tboot_enabled()) - return 1; + + if (WARN_ON_ONCE(!(msr & FEATURE_CONTROL_LOCKED))) + return 1; + + /* launched w/ TXT and VMX disabled */ + if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX) && + tboot_enabled()) + return 1; + /* launched w/o TXT and VMX only enabled w/ TXT */ + if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) && + (msr & FEATURE_CONTROL_VMXON_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 & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX) && + !tboot_enabled()) + return 1; return 0; } @@ -2226,7 +2228,6 @@ static int hardware_enable(void) { int cpu = raw_smp_processor_id(); u64 phys_addr = __pa(per_cpu(vmxarea, cpu)); - u64 old, test_bits; if (cr4_read_shadow() & X86_CR4_VMXE) return -EBUSY; @@ -2254,17 +2255,6 @@ static int hardware_enable(void) */ crash_enable_local_vmclear(cpu); - rdmsrl(MSR_IA32_FEATURE_CONTROL, old); - - test_bits = FEATURE_CONTROL_LOCKED; - test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; - if (tboot_enabled()) - test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX; - - if ((old & test_bits) != test_bits) { - /* enable and lock */ - wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits); - } kvm_cpu_vmxon(phys_addr); if (enable_ept) ept_sync_global(); -- 2.22.0