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Violators will be prosecuted; Mon, 5 Mar 2018 11:44:37 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w25BibvV55771156; Mon, 5 Mar 2018 11:44:37 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3F08E52041; Mon, 5 Mar 2018 10:36:17 +0000 (GMT) Received: from bradbury.ibm.com (unknown [9.152.222.40]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 16D225203F; Mon, 5 Mar 2018 10:36:17 +0000 (GMT) From: Viktor Mihajlovski To: libvir-list@redhat.com, pkrempa@redhat.com Date: Mon, 5 Mar 2018 12:44:29 +0100 In-Reply-To: <1520250269-12295-1-git-send-email-mihajlov@linux.vnet.ibm.com> References: <1520250269-12295-1-git-send-email-mihajlov@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18030511-0040-0000-0000-0000041AE1A2 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18030511-0041-0000-0000-0000261DF05C Message-Id: <1520250269-12295-7-git-send-email-mihajlov@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-03-05_05:, , 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 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1803050141 X-Greylist: Sender passed SPF test, Sender IP whitelisted by DNSRBL, ACL 207 matched, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 05 Mar 2018 11:44:46 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 05 Mar 2018 11:44:46 +0000 (UTC) for IP:'148.163.156.1' DOMAIN:'mx0a-001b2d01.pphosted.com' HELO:'mx0a-001b2d01.pphosted.com' FROM:'mihajlov@de.ibm.com' RCPT:'' X-RedHat-Spam-Score: -0.702 (RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2, SPF_PASS) 148.163.156.1 mx0a-001b2d01.pphosted.com 148.163.156.1 mx0a-001b2d01.pphosted.com X-Scanned-By: MIMEDefang 2.78 on 10.5.110.26 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-loop: libvir-list@redhat.com Subject: [libvirt] [PATCHv2 6/6] qemu: refresh vcpu halted state only via query-cpus-fast X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@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]); Mon, 05 Mar 2018 11:44:49 +0000 (UTC) X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" In order to not affect running VMs, refreshing the halted state is only performed if QEMU supports the query-cpus-fast QAPI. Signed-off-by: Viktor Mihajlovski Reviewed-by: Boris Fiuczynski Reviewed-by: Marc Hartmayer --- src/qemu/qemu_domain.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 4079fb3..a5fcf22 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -8801,8 +8801,13 @@ qemuDomainRefreshVcpuHalted(virQEMUDriverPtr driver, return 0; =20 /* The halted state is interresting only on s390(x). On other platforms - * the data would be stale at the time when it would be used. */ - if (!ARCH_IS_S390(vm->def->os.arch)) + * the data would be stale at the time when it would be used. + * Calling qemuMonitorGetCpuHalted() can adversely affect the running + * VM's performance unless QEMU supports query-cpus-fast. + */ + if (!ARCH_IS_S390(vm->def->os.arch) || + !virQEMUCapsGet(QEMU_DOMAIN_PRIVATE(vm)->qemuCaps, + QEMU_CAPS_QUERY_CPUS_FAST)) return 0; =20 if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0) --=20 1.9.1 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list