From patchwork Wed Nov 30 23:09:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13060621 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B1E8C47089 for ; Wed, 30 Nov 2022 23:15:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230145AbiK3XPD (ORCPT ); Wed, 30 Nov 2022 18:15:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229940AbiK3XOJ (ORCPT ); Wed, 30 Nov 2022 18:14:09 -0500 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4907DA1A03 for ; Wed, 30 Nov 2022 15:11:01 -0800 (PST) Received: by mail-pj1-x104a.google.com with SMTP id a3-20020a17090a8c0300b00218bfce4c03so3812344pjo.1 for ; Wed, 30 Nov 2022 15:11:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=sHcyHjJ8KuW26EmyMG2GCKXDxJlY2ojJURA0kcfw/9k=; b=VFFqhuPme1m1eQU16n2iG/J4RAGy2zrHzndrwcDa2UqPCuhmGJAJUoqWiUJ0hBawNj h+1PCcwEa7TWtGKSi7eE+1ph58rOUBv3xDHOkx/n95w6cUeiQfhXEh79gM7EIyUtnO0y ioN8O+FtRJeTVR0iP2uSqqMMZ5ce7bBX8TmoSKstA2185sSr20JSkv0QaUPbyNWz1HPN V+igGOZxxi1EiiIK8zOP02RlczC9ypmTY7mqbv223oTCKi8YwUrElYdikisBH1Zh971w Fr2k5IgU2gcv415RYRumMziSQSo+TFWu1mQkGuJbocDRmVfBg+o1I6JFksOzDsAHNWBN gCrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=sHcyHjJ8KuW26EmyMG2GCKXDxJlY2ojJURA0kcfw/9k=; b=kzdJ51LemOBxpgsJoKhTUoYnkRnBNs7iH4ZiXKGkIozEOEBTrTIamtWJQiRaNv95aI 3eq1l2cpGUDELO1gliCTX6s23N2Jy7/nQzDnmUbsZCINPWPI4SfV4ikNZ9nIiGQ0UPql 1agyS+F7BY5Nsg/OX8jRvpTKdZ7TfNZovR5zRv/ZV1m+0qc6Bvb3CEeXZ+XQbZukuflR dKIBLe0itTG4KGYlBOKss3HxctD+EwhAfWrp4DAfL3KdTwmpEM67DJdhN764wSQTOrOh hOFFQf8LxNqy62sLYp6zHPlkfNBrkB838oOcwTo5uRuOxLayV+18Gc94ssKHfHdiZ2Te ZFxw== X-Gm-Message-State: ANoB5pkDGiOPawyNeXDQZGpGRzrI3JKBtFvkb8gmR67P+U4deMkVygF7 mTL42CXeE73Uv/xbUDX5H+hxW5fFQLY= X-Google-Smtp-Source: AA0mqf6iPCX6KyjCp3cF1IRt5Mv13lZJWlEm0jsHehxUqphsE1Cogz37ZNgUSTWxB9XNJiT56sIeMfxkVVA= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a65:63d8:0:b0:477:172b:c350 with SMTP id n24-20020a6563d8000000b00477172bc350mr40707643pgv.313.1669849838234; Wed, 30 Nov 2022 15:10:38 -0800 (PST) Reply-To: Sean Christopherson Date: Wed, 30 Nov 2022 23:09:19 +0000 In-Reply-To: <20221130230934.1014142-1-seanjc@google.com> Mime-Version: 1.0 References: <20221130230934.1014142-1-seanjc@google.com> X-Mailer: git-send-email 2.38.1.584.g0f3c55d4c2-goog Message-ID: <20221130230934.1014142-36-seanjc@google.com> Subject: [PATCH v2 35/50] KVM: VMX: Use current CPU's info to perform "disabled by BIOS?" checks From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Matthew Rosato , Eric Farman , Sean Christopherson , Vitaly Kuznetsov , David Woodhouse , Paul Durrant Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Yuan Yao , Cornelia Huck , Isaku Yamahata , " =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= " , Fabiano Rosas , Michael Ellerman , Kai Huang , Chao Gao , Thomas Gleixner Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Use this_cpu_has() instead of boot_cpu_has() to perform the effective "disabled by BIOS?" checks for VMX. This will allow consolidating code between vmx_disabled_by_bios() and vmx_check_processor_compat(). Checking the boot CPU isn't a strict requirement as any divergence in VMX enabling between the boot CPU and other CPUs will result in KVM refusing to load thanks to the aforementioned vmx_check_processor_compat(). Furthermore, using the boot CPU was an unintentional change introduced by commit a4d0b2fdbcf7 ("KVM: VMX: Use VMX feature flag to query BIOS enabling"). Prior to using the feature flags, KVM checked the raw MSR value from the current CPU. Reported-by: Kai Huang Signed-off-by: Sean Christopherson Reviewed-by: Kai Huang --- arch/x86/kvm/vmx/vmx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index e859d2b7daa4..3f7d9f88b314 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2492,8 +2492,8 @@ static __init int cpu_has_kvm_support(void) static __init int vmx_disabled_by_bios(void) { - return !boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || - !boot_cpu_has(X86_FEATURE_VMX); + return !this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || + !this_cpu_has(X86_FEATURE_VMX); } static int kvm_cpu_vmxon(u64 vmxon_pointer)