From patchwork Wed May 12 14:42:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 438048 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 AB832C43461 for ; Wed, 12 May 2021 16:37:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73FCC61285 for ; Wed, 12 May 2021 16:37:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235865AbhELQh1 (ORCPT ); Wed, 12 May 2021 12:37:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:41570 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241764AbhELQ2A (ORCPT ); Wed, 12 May 2021 12:28:00 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C2DCF6144A; Wed, 12 May 2021 15:55:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620834959; bh=HKu2NVh0GALjBfKC7uw0Olii9p0xnhkNuj6HwVUd3cc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pegXZ1zMiyM50PyXxp31YFzxjpB9G1e/2plK1+M/FX+h1EMxqTPPGxaFobVwgeG3w Tdcec8osl8nI+9K9gfIfpwFD0q/4TwKEdWejSm+Yo5JFP0921fAeyOnDIHeB2vfsJn nNtBn9Xixrj+i5mD7N6x6A97wy5A8v8B4JINDERE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sean Christopherson , Vitaly Kuznetsov , Paolo Bonzini Subject: [PATCH 5.12 117/677] KVM: SVM: Inject #GP on guest MSR_TSC_AUX accesses if RDTSCP unsupported Date: Wed, 12 May 2021 16:42:43 +0200 Message-Id: <20210512144841.096628832@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144837.204217980@linuxfoundation.org> References: <20210512144837.204217980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Sean Christopherson commit 6f2b296aa6432d8274e258cc3220047ca04f5de0 upstream. Inject #GP on guest accesses to MSR_TSC_AUX if RDTSCP is unsupported in the guest's CPUID model. Fixes: 46896c73c1a4 ("KVM: svm: add support for RDTSCP") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson Message-Id: <20210423223404.3860547-2-seanjc@google.com> Reviewed-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/svm/svm.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2738,6 +2738,9 @@ static int svm_get_msr(struct kvm_vcpu * case MSR_TSC_AUX: if (!boot_cpu_has(X86_FEATURE_RDTSCP)) return 1; + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) + return 1; msr_info->data = svm->tsc_aux; break; /* @@ -2946,6 +2949,10 @@ static int svm_set_msr(struct kvm_vcpu * if (!boot_cpu_has(X86_FEATURE_RDTSCP)) return 1; + if (!msr->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) + return 1; + /* * This is rare, so we update the MSR here instead of using * direct_access_msrs. Doing that would require a rdmsr in