From nobody Sun Feb 8 17:49:25 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1558464973; cv=none; d=zoho.com; s=zohoarc; b=eVDsmw2vNR0Axo6NFoEzT0Soq3tzZQP6daYaKnvq8HLrDwEHttxcKKKvVWxbpxdSiF0LE5zaOjmjZ9hEc+l19+uN59++wq48MCvTVVl15D/UKJjMPkC45QCkbiNRql2wp22Cp+Qw43orBkmiFArPl6FBlIrMhy/DnYHahSUkFVA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1558464973; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=1MV7m8y1I5LQuZICej45hRc11XXpBfIBfKqvqm5YL8o=; b=IXniCSulWSrV0PXrPf1+il98M/1HxyeML1oA0pOp3gKBgXiAsOpuc89eE1tn9CPlo7AhIkanzkhdfB48+BcyBAA0DJGmlnKWEDR9lVHOotDz9lvn45YwDJApRaHG2fmD+ZIb7BEwwPpKL4zmCcsacDtY4VV4Sn78abDanYcmhgU= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1558464973959674.9979244415061; Tue, 21 May 2019 11:56:13 -0700 (PDT) Received: from localhost ([127.0.0.1]:57987 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hT9vd-0000zH-RM for importer@patchew.org; Tue, 21 May 2019 14:56:01 -0400 Received: from eggs.gnu.org ([209.51.188.92]:41778) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hT9u7-0008HJ-44 for qemu-devel@nongnu.org; Tue, 21 May 2019 14:54:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hT9rA-0005PF-PN for qemu-devel@nongnu.org; Tue, 21 May 2019 14:51:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37370) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hT9r8-0005Hy-AZ for qemu-devel@nongnu.org; Tue, 21 May 2019 14:51:22 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 687AFF74A6; Tue, 21 May 2019 18:51:05 +0000 (UTC) Received: from localhost (ovpn-116-14.gru2.redhat.com [10.97.116.14]) by smtp.corp.redhat.com (Postfix) with ESMTP id CF699646A0; Tue, 21 May 2019 18:51:04 +0000 (UTC) From: Eduardo Habkost To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 21 May 2019 15:50:57 -0300 Message-Id: <20190521185059.28236-2-ehabkost@redhat.com> In-Reply-To: <20190521185059.28236-1-ehabkost@redhat.com> References: <20190521185059.28236-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 21 May 2019 18:51:05 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 1/3] target/i386: define md-clear bit 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 , Eduardo Habkost , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Paolo Bonzini md-clear is a new CPUID bit which is set when microcode provides the mechanism to invoke a flush of various exploitable CPU buffers by invoking the VERW instruction. Signed-off-by: Paolo Bonzini Message-Id: <20190515141011.5315-2-berrange@redhat.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 2df56fa977..953d78b062 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1077,7 +1077,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORD= S] =3D { .feat_names =3D { NULL, NULL, "avx512-4vnniw", "avx512-4fmaps", NULL, NULL, NULL, NULL, - NULL, NULL, NULL, NULL, + NULL, NULL, "md-clear", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, --=20 2.18.0.rc1.1.g3f1ff2140 From nobody Sun Feb 8 17:49:25 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1558465230; cv=none; d=zoho.com; s=zohoarc; b=A7NkHuWRWsyAz3ETCfEAqOMxG4SDfCcSO9AkykfQOgOUXyAeKt6FwzIg7DEbJoE76nF1rvM/Bpr3TdRgo2C3mhbASlrzenHz9CD+OcwftT1KgiKhnxLGsi+yXJr4xx1jjUtGSMb5q/FNLhmttzW5SMWTRtJDpK9X4q+SqeqZBNc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1558465230; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=UuM8FCb/tx0NLIBd0b9xHfiqFBgYtWp2cMfLnJXbZAA=; b=TIVUv4goN56owBeVnwNLS+718WkMH00zOl1ED2cZLkkEXF9KSIU5O5PQqLdwrz6W9ShyEqzz/79XmnF+nnN0awogxseE9K4fW2ZWWUQEMQgZ0yZb1eSwp9/dkrRc8PbdsJXCWy8s7f9CrufC5n4NwntUqKZOxKLNkx7kQHXKVM0= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1558465230056650.1000117093192; Tue, 21 May 2019 12:00:30 -0700 (PDT) Received: from localhost ([127.0.0.1]:58030 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hT9zN-0004If-3Z for importer@patchew.org; Tue, 21 May 2019 14:59:53 -0400 Received: from eggs.gnu.org ([209.51.188.92]:41903) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hT9u9-0008PN-7Q for qemu-devel@nongnu.org; Tue, 21 May 2019 14:54:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hT9r7-0005O5-28 for qemu-devel@nongnu.org; Tue, 21 May 2019 14:51:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58206) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hT9r3-0005Iz-E7 for qemu-devel@nongnu.org; Tue, 21 May 2019 14:51:19 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id F221080F81; Tue, 21 May 2019 18:51:07 +0000 (UTC) Received: from localhost (ovpn-116-14.gru2.redhat.com [10.97.116.14]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7A2A25C269; Tue, 21 May 2019 18:51:07 +0000 (UTC) From: Eduardo Habkost To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 21 May 2019 15:50:58 -0300 Message-Id: <20190521185059.28236-3-ehabkost@redhat.com> In-Reply-To: <20190521185059.28236-1-ehabkost@redhat.com> References: <20190521185059.28236-1-ehabkost@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 21 May 2019 18:51:08 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 2/3] docs: recommend use of md-clear feature on all Intel CPUs 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 , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Eduardo Habkost , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Daniel P. Berrang=C3=A9 Update x86 CPU model guidance to recommend that the md-clear feature is manually enabled with all Intel CPU models, when supported by the host microcode. Signed-off-by: Daniel P. Berrang=C3=A9 Message-Id: <20190515141011.5315-3-berrange@redhat.com> Signed-off-by: Eduardo Habkost --- docs/qemu-cpu-models.texi | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/docs/qemu-cpu-models.texi b/docs/qemu-cpu-models.texi index 23c11dc86f..ad040cfc98 100644 --- a/docs/qemu-cpu-models.texi +++ b/docs/qemu-cpu-models.texi @@ -200,6 +200,18 @@ Not included by default in any Intel CPU model. Should be explicitly turned on for all Intel CPU models. =20 Note that not all CPU hardware will support this feature. + +@item @code{md-clear} + +Required to confirm the MDS (CVE-2018-12126, CVE-2018-12127, CVE-2018-1213= 0, +CVE-2019-11091) fixes. + +Not included by default in any Intel CPU model. + +Must be explicitly turned on for all Intel CPU models. + +Requires the host CPU microcode to support this feature before it +can be used for guest CPUs. @end table =20 =20 --=20 2.18.0.rc1.1.g3f1ff2140 From nobody Sun Feb 8 17:49:25 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1558464971; cv=none; d=zoho.com; s=zohoarc; b=kvfYoE3vmI5iy1qpTp0fvv6huvFi1emxuw23JR3S5eI9bIf7uERe673xuLcdN+STebdElnU9sdm78iEezzk4gPrDrX+NHgI88QanfGcQ74IKBOVXTD/BpRNWYx4bw6Z6a7nKzr2m6jnMlIFJ34uBrfgwarFBxDjnsaYFvZCx7eQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1558464971; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=GTg1KpL1gR56dMA0aX1GJXnWRngK5YyvmBGz0reyvvM=; b=Xzlaz2pGuN7j0Y+BG6MGXzdo4tGuqnHyyyumiz1LYqKGfPc+8NxL03Ii48P4lIfMoKyFio+1kCN/53iJpFVrGZkTZ9LDuHxvfitQnsF60hSRnvbyRdc2RgFaI/sjPPKr+8CMO6CsP5EhtVynxcuOU882nlsGNr2sveI1rA4FhsI= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (209.51.188.17 [209.51.188.17]) by mx.zohomail.com with SMTPS id 1558464971943411.3250195850799; Tue, 21 May 2019 11:56:11 -0700 (PDT) Received: from localhost ([127.0.0.1]:57989 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hT9vg-00010S-2G for importer@patchew.org; Tue, 21 May 2019 14:56:04 -0400 Received: from eggs.gnu.org ([209.51.188.92]:41809) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hT9u7-0008JL-3b for qemu-devel@nongnu.org; Tue, 21 May 2019 14:54:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hT9rG-0005Qs-0W for qemu-devel@nongnu.org; Tue, 21 May 2019 14:51:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33616) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hT9r8-0005Jq-Sj for qemu-devel@nongnu.org; Tue, 21 May 2019 14:51:24 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A24C781DFE; Tue, 21 May 2019 18:51:10 +0000 (UTC) Received: from localhost (ovpn-116-14.gru2.redhat.com [10.97.116.14]) by smtp.corp.redhat.com (Postfix) with ESMTP id F257F5C269; Tue, 21 May 2019 18:51:09 +0000 (UTC) From: Eduardo Habkost To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 21 May 2019 15:50:59 -0300 Message-Id: <20190521185059.28236-4-ehabkost@redhat.com> In-Reply-To: <20190521185059.28236-1-ehabkost@redhat.com> References: <20190521185059.28236-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 21 May 2019 18:51:10 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 3/3] target/i386: add MDS-NO feature 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 , Eduardo Habkost , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Paolo Bonzini Microarchitectural Data Sampling is a hardware vulnerability which allows unprivileged speculative access to data which is available in various CPU internal buffers. Some Intel processors use the ARCH_CAP_MDS_NO bit in the IA32_ARCH_CAPABILITIES MSR to report that they are not vulnerable, make it available to guests. Signed-off-by: Paolo Bonzini Message-Id: <20190516185320.28340-1-pbonzini@redhat.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 953d78b062..2f151dad8c 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -1184,7 +1184,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORD= S] =3D { .type =3D MSR_FEATURE_WORD, .feat_names =3D { "rdctl-no", "ibrs-all", "rsba", "skip-l1dfl-vmentry", - "ssb-no", NULL, NULL, NULL, + "ssb-no", "mds-no", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, --=20 2.18.0.rc1.1.g3f1ff2140