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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 B0072C2D0CE for ; Sun, 29 Dec 2019 17:58:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8B4F3222C3 for ; Sun, 29 Dec 2019 17:58:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577642299; bh=iTZR3SpRq2wY9Ep4gpB+c/ynW1BnyIfbSusvbnoKGPs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2lPQDGgOTBzS4EyNLIG4a7PpI9CnOj/TVmTNLrqahIl1TUNORccDzNuMgjOyjrfXU 0dGMlOIRxKTl1zOycOFo8vpAvfU6wpoq28pNNPl/OfyPMo4ElYkTmovlP+Y/SUnAKJ 0mfB4JeqbVLuEQ5HKUPTeVoi7xnGc8sk4LZMiE3Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387494AbfL2R6S (ORCPT ); Sun, 29 Dec 2019 12:58:18 -0500 Received: from mail.kernel.org ([198.145.29.99]:49310 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387469AbfL2R6R (ORCPT ); Sun, 29 Dec 2019 12:58:17 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C0B89206DB; Sun, 29 Dec 2019 17:58:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577642297; bh=iTZR3SpRq2wY9Ep4gpB+c/ynW1BnyIfbSusvbnoKGPs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ztsiq1lgPa7ZFHVp+HbSAzu7X0ZMTW/839Wv0Djd+HC6rHihkNvjlwjmaWdZqR5uV O28UnbAMeXeqvNXhT3ChcLyvFfj3nxaKXUL+jcy06EFqcq39QOYwoSwFEW8Ylv9ZxM Buu3IPLUdBx1m90cZnrLicwDcdRSGw+2Oed8TIOM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jim Mattson , Jacob Xu , Peter Shier , Paolo Bonzini , Eric Biggers Subject: [PATCH 5.4 417/434] kvm: x86: Host feature SSBD doesnt imply guest feature AMD_SSBD Date: Sun, 29 Dec 2019 18:27:50 +0100 Message-Id: <20191229172730.635509330@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191229172702.393141737@linuxfoundation.org> References: <20191229172702.393141737@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jim Mattson commit 8715f05269bfbc6453e25e80825d781a82902f8e upstream. The host reports support for the synthetic feature X86_FEATURE_SSBD when any of the three following hardware features are set: CPUID.(EAX=7,ECX=0):EDX.SSBD[bit 31] CPUID.80000008H:EBX.AMD_SSBD[bit 24] CPUID.80000008H:EBX.VIRT_SSBD[bit 25] Either of the first two hardware features implies the existence of the IA32_SPEC_CTRL MSR, but CPUID.80000008H:EBX.VIRT_SSBD[bit 25] does not. Therefore, CPUID.80000008H:EBX.AMD_SSBD[bit 24] should only be set in the guest if CPUID.(EAX=7,ECX=0):EDX.SSBD[bit 31] or CPUID.80000008H:EBX.AMD_SSBD[bit 24] is set on the host. Fixes: 4c6903a0f9d76 ("KVM: x86: fix reporting of AMD speculation bug CPUID leaf") Signed-off-by: Jim Mattson Reviewed-by: Jacob Xu Reviewed-by: Peter Shier Cc: Paolo Bonzini Cc: stable@vger.kernel.org Reported-by: Eric Biggers Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/cpuid.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -760,7 +760,8 @@ static inline int __do_cpuid_func(struct entry->ebx |= F(AMD_IBRS); if (boot_cpu_has(X86_FEATURE_STIBP)) entry->ebx |= F(AMD_STIBP); - if (boot_cpu_has(X86_FEATURE_SSBD)) + if (boot_cpu_has(X86_FEATURE_SPEC_CTRL_SSBD) || + boot_cpu_has(X86_FEATURE_AMD_SSBD)) entry->ebx |= F(AMD_SSBD); if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS)) entry->ebx |= F(AMD_SSB_NO);