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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 86334C433ED for ; Mon, 17 May 2021 08:52:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 60592611BD for ; Mon, 17 May 2021 08:52:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235711AbhEQIx2 (ORCPT ); Mon, 17 May 2021 04:53:28 -0400 Received: from wforward1-smtp.messagingengine.com ([64.147.123.30]:44777 "EHLO wforward1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235456AbhEQIx2 (ORCPT ); Mon, 17 May 2021 04:53:28 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailforward.west.internal (Postfix) with ESMTP id 9FF009DD; Mon, 17 May 2021 04:52:11 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Mon, 17 May 2021 04:52:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=/UIcWk 19st4YXNYqvwolEzf52YVnYzAn5mDZ7YHNpvc=; b=m8c4r1pRRol6D0EEL9OBNs RxvHe/X2zIBY7ZCLls8jbu/g/ViUurvXsCsGK7A6svulWnQRmvZZzBlXpdnzJF+U suaSpuvAcJlFdeixn0TfaAK6v6RiunBAiGq6pzr0Qr6MIN4BV7cKbjSR3Vhp+jVc xmJCWzlOIWWpcZjzeBb1oy561IyIRPw7PKdLyaNgSyrU+hXMwbShg9Iw1wVEIYE4 ldpXRbiraIZKtpfnej4KqiozeHlnrUJhiegNTJpSvv2OuxJYG8KrwflHe9vUV3W/ E/EGEj4KdB9WQPBWhYcaAO0qym+H4v/LQ2Nu9tlmaHfPcnwBCshXkKRZld9r349w == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrvdeihedgtdelucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpefuvffhfffkgggtgfesthekredttd dtlfenucfhrhhomhepoehgrhgvghhkhheslhhinhhugihfohhunhgurghtihhonhdrohhr gheqnecuggftrfgrthhtvghrnhepieetveehuedvhfdtgfdvieeiheehfeelveevheejud etveeuveeludejjefgteehnecukfhppeekfedrkeeirdejgedrieegnecuvehluhhsthgv rhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepghhrvghgsehkrhhorghhrd gtohhm X-ME-Proxy: Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 17 May 2021 04:52:10 -0400 (EDT) Subject: FAILED: patch "[PATCH] KVM: SVM: Inject #UD on RDTSCP when it should be disabled in" failed to apply to 5.10-stable tree To: seanjc@google.com, jmattson@google.com, pbonzini@redhat.com, reijiw@google.com Cc: From: Date: Mon, 17 May 2021 10:52:09 +0200 Message-ID: <162124152923138@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 3b195ac9260235624b1c18f7bdaef184479c1d41 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Tue, 4 May 2021 10:17:22 -0700 Subject: [PATCH] KVM: SVM: Inject #UD on RDTSCP when it should be disabled in the guest Intercept RDTSCP to inject #UD if RDTSC is disabled in the guest. Note, SVM does not support intercepting RDPID. Unlike VMX's ENABLE_RDTSCP control, RDTSCP interception does not apply to RDPID. This is a benign virtualization hole as the host kernel (incorrectly) sets MSR_TSC_AUX if RDTSCP is supported, and KVM loads the guest's MSR_TSC_AUX into hardware if RDTSCP is supported in the host, i.e. KVM will not leak the host's MSR_TSC_AUX to the guest. But, when the kernel bug is fixed, KVM will start leaking the host's MSR_TSC_AUX if RDPID is supported in hardware, but RDTSCP isn't available for whatever reason. This leak will be remedied in a future commit. Fixes: 46896c73c1a4 ("KVM: svm: add support for RDTSCP") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson Message-Id: <20210504171734.1434054-4-seanjc@google.com> Reviewed-by: Jim Mattson Reviewed-by: Reiji Watanabe Signed-off-by: Paolo Bonzini diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index be5cf612ab1f..ebcb5849d69b 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1100,7 +1100,9 @@ static u64 svm_write_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) return svm->vmcb->control.tsc_offset; } -static void svm_check_invpcid(struct vcpu_svm *svm) +/* Evaluate instruction intercepts that depend on guest CPUID features. */ +static void svm_recalc_instruction_intercepts(struct kvm_vcpu *vcpu, + struct vcpu_svm *svm) { /* * Intercept INVPCID if shadow paging is enabled to sync/free shadow @@ -1113,6 +1115,13 @@ static void svm_check_invpcid(struct vcpu_svm *svm) else svm_clr_intercept(svm, INTERCEPT_INVPCID); } + + if (kvm_cpu_cap_has(X86_FEATURE_RDTSCP)) { + if (guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) + svm_clr_intercept(svm, INTERCEPT_RDTSCP); + else + svm_set_intercept(svm, INTERCEPT_RDTSCP); + } } static void init_vmcb(struct kvm_vcpu *vcpu) @@ -1248,7 +1257,7 @@ static void init_vmcb(struct kvm_vcpu *vcpu) svm_clr_intercept(svm, INTERCEPT_PAUSE); } - svm_check_invpcid(svm); + svm_recalc_instruction_intercepts(vcpu, svm); /* * If the host supports V_SPEC_CTRL then disable the interception @@ -3084,6 +3093,7 @@ static int (*const svm_exit_handlers[])(struct kvm_vcpu *vcpu) = { [SVM_EXIT_STGI] = stgi_interception, [SVM_EXIT_CLGI] = clgi_interception, [SVM_EXIT_SKINIT] = skinit_interception, + [SVM_EXIT_RDTSCP] = kvm_handle_invalid_op, [SVM_EXIT_WBINVD] = kvm_emulate_wbinvd, [SVM_EXIT_MONITOR] = kvm_emulate_monitor, [SVM_EXIT_MWAIT] = kvm_emulate_mwait, @@ -4007,8 +4017,7 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) svm->nrips_enabled = kvm_cpu_cap_has(X86_FEATURE_NRIPS) && guest_cpuid_has(vcpu, X86_FEATURE_NRIPS); - /* Check again if INVPCID interception if required */ - svm_check_invpcid(svm); + svm_recalc_instruction_intercepts(vcpu, svm); /* For sev guests, the memory encryption bit is not reserved in CR3. */ if (sev_guest(vcpu->kvm)) {