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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 56E19C07E96 for ; Fri, 2 Jul 2021 22:07:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4054061410 for ; Fri, 2 Jul 2021 22:07:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234080AbhGBWKP (ORCPT ); Fri, 2 Jul 2021 18:10:15 -0400 Received: from mga12.intel.com ([192.55.52.136]:50197 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233131AbhGBWH5 (ORCPT ); Fri, 2 Jul 2021 18:07:57 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10033"; a="188472732" X-IronPort-AV: E=Sophos;i="5.83,320,1616482800"; d="scan'208";a="188472732" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jul 2021 15:05:24 -0700 X-IronPort-AV: E=Sophos;i="5.83,320,1616482800"; d="scan'208";a="642814756" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jul 2021 15:05:23 -0700 From: isaku.yamahata@intel.com To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , erdemaktas@google.com, Connor Kuehl , Sean Christopherson , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Sean Christopherson , Kai Huang Subject: [RFC PATCH v2 26/69] KVM: x86: Add flag to disallow #MC injection / KVM_X86_SETUP_MCE Date: Fri, 2 Jul 2021 15:04:32 -0700 Message-Id: <456e910585c72e5dfdff30bfea63afa874965479.1625186503.git.isaku.yamahata@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sean Christopherson Add a flag to disallow MCE injection and reject KVM_X86_SETUP_MCE with -EINVAL when set. TDX doesn't support injecting exceptions, including (virtual) #MCs. Co-developed-by: Kai Huang Signed-off-by: Kai Huang Signed-off-by: Sean Christopherson Signed-off-by: Isaku Yamahata --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/x86.c | 14 +++++++------- 2 files changed, 8 insertions(+), 7 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index be329f0a7054..09e51c5e86b3 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1064,6 +1064,7 @@ struct kvm_arch { bool bus_lock_detection_enabled; bool irq_injection_disallowed; + bool mce_injection_disallowed; /* Deflect RDMSR and WRMSR to user space when they trigger a #GP */ u32 user_space_msr_mask; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 4070786f17d1..681fc3be2b2b 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4319,15 +4319,16 @@ static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, u64 mcg_cap) { - int r; unsigned bank_num = mcg_cap & 0xff, bank; - r = -EINVAL; + if (vcpu->kvm->arch.mce_injection_disallowed) + return -EINVAL; + if (!bank_num || bank_num > KVM_MAX_MCE_BANKS) - goto out; + return -EINVAL; if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000)) - goto out; - r = 0; + return -EINVAL; + vcpu->arch.mcg_cap = mcg_cap; /* Init IA32_MCG_CTL to all 1s */ if (mcg_cap & MCG_CTL_P) @@ -4337,8 +4338,7 @@ static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, vcpu->arch.mce_banks[bank*4] = ~(u64)0; static_call(kvm_x86_setup_mce)(vcpu); -out: - return r; + return 0; } static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, -- 2.25.1