From nobody Fri Dec 19 20:11:30 2025 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 155415335721717.876530763979304; Mon, 1 Apr 2019 14:15:57 -0700 (PDT) Received: from localhost ([127.0.0.1]:41143 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB4Ha-0005ED-47 for importer@patchew.org; Mon, 01 Apr 2019 17:15:54 -0400 Received: from eggs.gnu.org ([209.51.188.92]:40811) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB44X-0001K5-5Q for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:02:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hB44V-0003NW-8O for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:02:25 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:53678) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hB44U-0003BY-Mx for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:02:23 -0400 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x31L1rPs122274 for ; Mon, 1 Apr 2019 17:01:59 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rksyg8pqx-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 01 Apr 2019 17:01:57 -0400 Received: from localhost by e13.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 1 Apr 2019 22:01:54 +0100 Received: from b01cxnp22034.gho.pok.ibm.com (9.57.198.24) by e13.ny.us.ibm.com (146.89.104.200) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 1 Apr 2019 22:01:51 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x31L1otS23527424 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 1 Apr 2019 21:01:50 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9DDF4B205F; Mon, 1 Apr 2019 21:01:50 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7288AB2067; Mon, 1 Apr 2019 21:01:50 +0000 (GMT) Received: from localhost (unknown [9.80.94.43]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 1 Apr 2019 21:01:50 +0000 (GMT) From: Michael Roth To: qemu-devel@nongnu.org Date: Mon, 1 Apr 2019 15:58:59 -0500 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> References: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19040121-0064-0000-0000-000003C51726 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010857; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000283; SDB=6.01182941; UDB=6.00619269; IPR=6.00963683; MB=3.00026249; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-01 21:01:52 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040121-0065-0000-0000-00003CEA8099 Message-Id: <20190401210011.16009-26-mdroth@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-01_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=988 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904010136 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH 25/97] i386: Disable TOPOEXT by default on "-cpu host" 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: qemu-stable@nongnu.org, Eduardo Habkost 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: Eduardo Habkost Enabling TOPOEXT is always allowed, but it can't be enabled blindly by "-cpu host" because it may make guests crash if the rest of the cache topology information isn't provided or isn't consistent. This addresses the bug reported at: https://bugzilla.redhat.com/show_bug.cgi?id=3D1613277 Signed-off-by: Eduardo Habkost Message-Id: <20180809221852.15285-1-ehabkost@redhat.com> Tested-by: Richard W.M. Jones Reviewed-by: Babu Moger Signed-off-by: Eduardo Habkost (cherry picked from commit 7210a02c58572b2686a3a8d610c6628f87864aed) Signed-off-by: Michael Roth --- target/i386/cpu.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 723e02221e..3ac627978f 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -849,6 +849,12 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS= ] =3D { }, .cpuid_eax =3D 0x80000001, .cpuid_reg =3D R_ECX, .tcg_features =3D TCG_EXT3_FEATURES, + /* + * TOPOEXT is always allowed but can't be enabled blindly by + * "-cpu host", as it requires consistent cache topology info + * to be provided so it doesn't confuse guests. + */ + .no_autoenable_flags =3D CPUID_EXT3_TOPOEXT, }, [FEAT_C000_0001_EDX] =3D { .feat_names =3D { --=20 2.17.1