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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 2BD2DC32751 for ; Wed, 31 Jul 2019 07:25:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EF373206A2 for ; Wed, 31 Jul 2019 07:25:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728165AbfGaHZE (ORCPT ); Wed, 31 Jul 2019 03:25:04 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:55580 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727312AbfGaHZD (ORCPT ); Wed, 31 Jul 2019 03:25:03 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6V7M17P112509 for ; Wed, 31 Jul 2019 03:25:02 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0b-001b2d01.pphosted.com with ESMTP id 2u34xhca5y-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 31 Jul 2019 03:25:02 -0400 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 31 Jul 2019 08:24:55 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6V7OsDD41091580 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 31 Jul 2019 07:24:54 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B9CE9AE04D; Wed, 31 Jul 2019 07:24:54 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5ADD0AE053; Wed, 31 Jul 2019 07:24:54 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.71]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 31 Jul 2019 07:24:54 +0000 (GMT) Subject: Re: [PATCH 3/3] i386/kvm: initialize struct at full before ioctl call To: Paolo Bonzini , Andrey Shinkevich , qemu-devel@nongnu.org, qemu-block@nongnu.org Cc: kvm@vger.kernel.org, berto@igalia.com, mdroth@linux.vnet.ibm.com, armbru@redhat.com, ehabkost@redhat.com, rth@twiddle.net, mtosatti@redhat.com, den@openvz.org, vsementsov@virtuozzo.com References: <1564502498-805893-1-git-send-email-andrey.shinkevich@virtuozzo.com> <1564502498-805893-4-git-send-email-andrey.shinkevich@virtuozzo.com> <14b60c5b-6ed4-0f4d-17a8-6ec861115c1e@redhat.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <14b60c5b-6ed4-0f4d-17a8-6ec861115c1e@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19073107-4275-0000-0000-00000352498B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19073107-4276-0000-0000-000038633808 Message-Id: <30f40221-d2d2-780b-3375-910e9f755edd@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-31_03:,, 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1907310078 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 30.07.19 21:20, Paolo Bonzini wrote: > On 30/07/19 18:01, Andrey Shinkevich wrote: >> Not the whole structure is initialized before passing it to the KVM. >> Reduce the number of Valgrind reports. >> >> Signed-off-by: Andrey Shinkevich > > Christian, is this the right fix? It's not expensive so it wouldn't be > an issue, just checking if there's any better alternative. I think all of these variants are valid with pros and cons 1. teach valgrind about this: Add to coregrind/m_syswrap/syswrap-linux.c (and the relevant header files) knowledge about which parts are actually touched. 2. use designated initializers 3. use memset 3. use a valgrind callback VG_USERREQ__MAKE_MEM_DEFINED to tell that this memory is defined > > Paolo > >> --- >> target/i386/kvm.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/target/i386/kvm.c b/target/i386/kvm.c >> index dbbb137..ed57e31 100644 >> --- a/target/i386/kvm.c >> +++ b/target/i386/kvm.c >> @@ -190,6 +190,7 @@ static int kvm_get_tsc(CPUState *cs) >> return 0; >> } >> >> + memset(&msr_data, 0, sizeof(msr_data)); >> msr_data.info.nmsrs = 1; >> msr_data.entries[0].index = MSR_IA32_TSC; >> env->tsc_valid = !runstate_is_running(); >> @@ -1706,6 +1707,7 @@ int kvm_arch_init_vcpu(CPUState *cs) >> >> if (has_xsave) { >> env->xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave)); >> + memset(env->xsave_buf, 0, sizeof(struct kvm_xsave)); >> } >> >> max_nested_state_len = kvm_max_nested_state_length(); >> @@ -3477,6 +3479,7 @@ static int kvm_put_debugregs(X86CPU *cpu) >> return 0; >> } >> >> + memset(&dbgregs, 0, sizeof(dbgregs)); >> for (i = 0; i < 4; i++) { >> dbgregs.db[i] = env->dr[i]; >> } >> -- >> 1.8.3.1 >> > > 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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 581ABC433FF for ; Wed, 31 Jul 2019 07:25:58 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2BB7A206A2 for ; Wed, 31 Jul 2019 07:25:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2BB7A206A2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=de.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38460 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hsizl-0005IN-3N for qemu-devel@archiver.kernel.org; Wed, 31 Jul 2019 03:25:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56437) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hsiyx-0004TE-O3 for qemu-devel@nongnu.org; Wed, 31 Jul 2019 03:25:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hsiyu-00082O-LE for qemu-devel@nongnu.org; Wed, 31 Jul 2019 03:25:06 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:55080) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hsiyu-0007yu-Br for qemu-devel@nongnu.org; Wed, 31 Jul 2019 03:25:04 -0400 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6V7MDoG112201 for ; Wed, 31 Jul 2019 03:25:03 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2u33vaenkd-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 31 Jul 2019 03:25:02 -0400 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 31 Jul 2019 08:24:55 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6V7OsDD41091580 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 31 Jul 2019 07:24:54 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B9CE9AE04D; Wed, 31 Jul 2019 07:24:54 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5ADD0AE053; Wed, 31 Jul 2019 07:24:54 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.71]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 31 Jul 2019 07:24:54 +0000 (GMT) To: Paolo Bonzini , Andrey Shinkevich , qemu-devel@nongnu.org, qemu-block@nongnu.org References: <1564502498-805893-1-git-send-email-andrey.shinkevich@virtuozzo.com> <1564502498-805893-4-git-send-email-andrey.shinkevich@virtuozzo.com> <14b60c5b-6ed4-0f4d-17a8-6ec861115c1e@redhat.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <14b60c5b-6ed4-0f4d-17a8-6ec861115c1e@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19073107-4275-0000-0000-00000352498B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19073107-4276-0000-0000-000038633808 Message-Id: <30f40221-d2d2-780b-3375-910e9f755edd@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-07-31_03:, , 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1907310078 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: Re: [Qemu-devel] [PATCH 3/3] i386/kvm: initialize struct at full before ioctl call X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: vsementsov@virtuozzo.com, berto@igalia.com, ehabkost@redhat.com, kvm@vger.kernel.org, mtosatti@redhat.com, mdroth@linux.vnet.ibm.com, armbru@redhat.com, den@openvz.org, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 30.07.19 21:20, Paolo Bonzini wrote: > On 30/07/19 18:01, Andrey Shinkevich wrote: >> Not the whole structure is initialized before passing it to the KVM. >> Reduce the number of Valgrind reports. >> >> Signed-off-by: Andrey Shinkevich > > Christian, is this the right fix? It's not expensive so it wouldn't be > an issue, just checking if there's any better alternative. I think all of these variants are valid with pros and cons 1. teach valgrind about this: Add to coregrind/m_syswrap/syswrap-linux.c (and the relevant header files) knowledge about which parts are actually touched. 2. use designated initializers 3. use memset 3. use a valgrind callback VG_USERREQ__MAKE_MEM_DEFINED to tell that this memory is defined > > Paolo > >> --- >> target/i386/kvm.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/target/i386/kvm.c b/target/i386/kvm.c >> index dbbb137..ed57e31 100644 >> --- a/target/i386/kvm.c >> +++ b/target/i386/kvm.c >> @@ -190,6 +190,7 @@ static int kvm_get_tsc(CPUState *cs) >> return 0; >> } >> >> + memset(&msr_data, 0, sizeof(msr_data)); >> msr_data.info.nmsrs = 1; >> msr_data.entries[0].index = MSR_IA32_TSC; >> env->tsc_valid = !runstate_is_running(); >> @@ -1706,6 +1707,7 @@ int kvm_arch_init_vcpu(CPUState *cs) >> >> if (has_xsave) { >> env->xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave)); >> + memset(env->xsave_buf, 0, sizeof(struct kvm_xsave)); >> } >> >> max_nested_state_len = kvm_max_nested_state_length(); >> @@ -3477,6 +3479,7 @@ static int kvm_put_debugregs(X86CPU *cpu) >> return 0; >> } >> >> + memset(&dbgregs, 0, sizeof(dbgregs)); >> for (i = 0; i < 4; i++) { >> dbgregs.db[i] = env->dr[i]; >> } >> -- >> 1.8.3.1 >> > >