From nobody Mon Feb 9 08:55:09 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1529965829203533.034544943283; Mon, 25 Jun 2018 15:30:29 -0700 (PDT) Received: from localhost ([::1]:49521 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXa0C-0005Cg-DB for importer@patchew.org; Mon, 25 Jun 2018 18:30:28 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54326) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXZvc-0001qU-S0 for qemu-devel@nongnu.org; Mon, 25 Jun 2018 18:25:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fXZvb-0003Et-Q8 for qemu-devel@nongnu.org; Mon, 25 Jun 2018 18:25:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42868) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fXZvb-0003EE-Jo for qemu-devel@nongnu.org; Mon, 25 Jun 2018 18:25:43 -0400 Received: from smtp.corp.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D41008763C; Mon, 25 Jun 2018 22:25:42 +0000 (UTC) Received: from localhost (ovpn-116-16.gru2.redhat.com [10.97.116.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6733B30001E5; Mon, 25 Jun 2018 22:25:42 +0000 (UTC) From: Eduardo Habkost To: Peter Maydell , qemu-devel@nongnu.org Date: Mon, 25 Jun 2018 19:25:20 -0300 Message-Id: <20180625222524.382-9-ehabkost@redhat.com> In-Reply-To: <20180625222524.382-1-ehabkost@redhat.com> References: <20180625222524.382-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 25 Jun 2018 22:25:42 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 08/12] i386: Define AMD's no SSB mitigation needed. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Konrad Rzeszutek Wilk , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Konrad Rzeszutek Wilk AMD future CPUs expose a mechanism to tell the guest that the Speculative Store Bypass Disable is not needed and that the CPU is all good. This is exposed via the CPUID 8000_0008.EBX[26] bit. See 124441_AMD64_SpeculativeStoreBypassDisable_Whitepaper_final.pdf A copy of this document is available at https://bugzilla.kernel.org/show_bug.cgi?id=3D199889 Signed-off-by: Konrad Rzeszutek Wilk Message-Id: <20180601153809.15259-3-konrad.wilk@oracle.com> Signed-off-by: Eduardo Habkost --- target/i386/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 7234bebfcb..7a4484bb06 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1009,7 +1009,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORD= S] =3D { "ibpb", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, - "amd-ssbd", "virt-ssbd", NULL, NULL, + "amd-ssbd", "virt-ssbd", "amd-no-ssb", NULL, NULL, NULL, NULL, NULL, }, .cpuid_eax =3D 0x80000008, --=20 2.18.0.rc1.1.g3f1ff2140