From patchwork Fri Jun 1 15:38:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Konrad Rzeszutek Wilk X-Patchwork-Id: 924111 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=oracle.com header.i=@oracle.com header.b="ZUlPP8RX"; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 40y7pb3dTpz9rxs for ; Sat, 2 Jun 2018 01:41:11 +1000 (AEST) Received: from localhost ([::1]:56264 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fOmAv-0004jW-4g for incoming@patchwork.ozlabs.org; Fri, 01 Jun 2018 11:41:09 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56870) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fOm8C-0002tx-2N for qemu-devel@nongnu.org; Fri, 01 Jun 2018 11:38:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fOm88-0003C4-4F for qemu-devel@nongnu.org; Fri, 01 Jun 2018 11:38:20 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:57964) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fOm87-0003Az-R6 for qemu-devel@nongnu.org; Fri, 01 Jun 2018 11:38:16 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w51FZgqE098466; Fri, 1 Jun 2018 15:38:13 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2017-10-26; bh=NHqrFijOU/WpyIVXqm+1YLriXWsevycf91nt++twXvc=; b=ZUlPP8RXme6kqlp+jbbXv6JkfcOWBusObIFXNLcZuVqKDfiaRnLWVsjoHY1rJ0HtDkKo OTEfW42aNcw2AvH10NsQD8YViN9Qo5EctoHO+Ry9Om8gXXvcHZfGAW3h6cm+FYdSzD7G NwcsspvaiYaEBiul6klTtufQAEcGhpOWb/A77grJUZi9RU/zoxcUXCUYTbUkQBtAVCIh O0DjwOoEQpaR2taL490xBW0cNI7YWny8y3kMw7Y2jtzdqbxMFn+nOemDRg47SidBBNYH 1LzZsc81Ofp2CyxTvCtiBU9ZE4dm3CzEN6xunFLy1600PMHgzy9w3Soo9nByaNl5iUwU vg== Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp2130.oracle.com with ESMTP id 2janje5d21-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 01 Jun 2018 15:38:13 +0000 Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w51FcC9P005245 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 1 Jun 2018 15:38:12 GMT Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id w51FcCNI023754; Fri, 1 Jun 2018 15:38:12 GMT Received: from char.us.oracle.com (/10.137.176.158) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 01 Jun 2018 08:38:12 -0700 Received: by char.us.oracle.com (Postfix, from userid 1000) id C20106A00E3; Fri, 1 Jun 2018 11:38:10 -0400 (EDT) From: Konrad Rzeszutek Wilk To: kvm@vger.kernel.org, qemu-devel@nongnu.org, pbonzini@redhat.com, ehabkost@redhat.com, rth@twiddle.net Date: Fri, 1 Jun 2018 11:38:09 -0400 Message-Id: <20180601153809.15259-3-konrad.wilk@oracle.com> X-Mailer: git-send-email 2.13.4 In-Reply-To: <20180601153809.15259-1-konrad.wilk@oracle.com> References: <20180601145921.9500-1-konrad.wilk@oracle.com> <20180601153809.15259-1-konrad.wilk@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8911 signatures=668702 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=667 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1805220000 definitions=main-1806010182 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 156.151.31.86 Subject: [Qemu-devel] [PATCH 2/2] 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: Konrad Rzeszutek Wilk Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" 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=199889 Signed-off-by: Konrad Rzeszutek Wilk --- 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 f91990c..43b1532 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -490,7 +490,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = { "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 = 0x80000008,