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, 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 15FB7C2D0DB for ; Wed, 22 Jan 2020 08:25:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D972624655 for ; Wed, 22 Jan 2020 08:25:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726077AbgAVIZe (ORCPT ); Wed, 22 Jan 2020 03:25:34 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:39878 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726005AbgAVIZd (ORCPT ); Wed, 22 Jan 2020 03:25:33 -0500 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00M8MlrR009894 for ; Wed, 22 Jan 2020 03:25:32 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0a-001b2d01.pphosted.com with ESMTP id 2xp962dwun-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 22 Jan 2020 03:25:32 -0500 Received: from localhost by e06smtp05.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, 22 Jan 2020 08:25:27 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00M8Oa9o38928774 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 22 Jan 2020 08:24:36 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5CAF452063; Wed, 22 Jan 2020 08:25:26 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.86.132]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 026CC52059; Wed, 22 Jan 2020 08:25:25 +0000 (GMT) Subject: Re: [kvm-unit-tests PATCH v4 4/9] s390x: smp: Rework cpu start and active tracking To: David Hildenbrand , kvm@vger.kernel.org Cc: thuth@redhat.com, borntraeger@de.ibm.com, linux-s390@vger.kernel.org, cohuck@redhat.com References: <20200121134254.4570-1-frankja@linux.ibm.com> <20200121134254.4570-5-frankja@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="k5dl6NC2QUxdYVH3dLuNpue1f1aXqx8i9" X-TM-AS-GCONF: 00 x-cbid: 20012208-0020-0000-0000-000003A2E9B2 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20012208-0021-0000-0000-000021FA7CF8 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-17_05:2020-01-16,2020-01-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 impostorscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 mlxscore=0 suspectscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001220076 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --k5dl6NC2QUxdYVH3dLuNpue1f1aXqx8i9 Content-Type: multipart/mixed; boundary="paD5wABuL9wR4OGqKgXwcI10JaUWME7Qm" --paD5wABuL9wR4OGqKgXwcI10JaUWME7Qm Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 1/21/20 6:40 PM, David Hildenbrand wrote: > On 21.01.20 14:42, Janosch Frank wrote: >> The architecture specifies that processing sigp orders may be >> asynchronous, and this is indeed the case on some hypervisors, so we >> need to wait until the cpu runs before we return from the setup/start >> function. >> >> As there was a lot of duplicate code, a common function for cpu >> restarts has been introduced. >> >> Signed-off-by: Janosch Frank >> Reviewed-by: Cornelia Huck >> --- >> lib/s390x/smp.c | 50 ++++++++++++++++++++++++++++--------------------= - >> 1 file changed, 29 insertions(+), 21 deletions(-) >> >> diff --git a/lib/s390x/smp.c b/lib/s390x/smp.c >> index f57f420..84e681d 100644 >> --- a/lib/s390x/smp.c >> +++ b/lib/s390x/smp.c >> @@ -104,35 +104,46 @@ int smp_cpu_stop_store_status(uint16_t addr) >> return rc; >> } >> =20 >> +static int smp_cpu_restart_nolock(uint16_t addr, struct psw *psw) >> +{ >> + int rc; >> + struct cpu *cpu =3D smp_cpu_from_addr(addr); >> + >> + if (!cpu) >> + return -1; >> + if (psw) { >> + cpu->lowcore->restart_new_psw.mask =3D psw->mask; >> + cpu->lowcore->restart_new_psw.addr =3D psw->addr; >> + } >> + rc =3D sigp(addr, SIGP_RESTART, 0, NULL); >> + if (rc) >> + return rc; >> + /* >> + * The order has been accepted, but the actual restart may not >> + * have been performed yet, so wait until the cpu is running. >> + */ >> + while (!smp_cpu_running(addr)) >> + mb(); >> + cpu->active =3D true; >> + return 0; >> +} >> + >=20 > Just wondering what happened to my comment It probably got lost in your other change requests :) >=20 > "Should you make sure to stop the CPU before issuing the restart? > Otherwise you will get false positives if it is still running (but > hasn't processed the RESTART yet)" >=20 > ? >=20 > IOW, should we have a SIGP_STOP before issuing the SIGP_RESTART? Yes, that would be cleaner. --paD5wABuL9wR4OGqKgXwcI10JaUWME7Qm-- --k5dl6NC2QUxdYVH3dLuNpue1f1aXqx8i9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl4oBvUACgkQ41TmuOI4 ufgQNw//UpqxqREtIzIp9p8i+uVbx+1Nz+juTKfrDqcnacSV8fu0jbIAU4RQH7O+ y4uKUBzqATDVFfiKYmTvfwNwGYPpl0XQ48gJOiHReGIS7ipDE8NqLJMMd9MjfT6G 7hBb5UNZ2IqYSV78EoDWr82B7NADlUglI3eMcJtXf0b0aoe1Ui4xYB5fRUjVKw4A +JVaNAe69GrjTmvg2d6ZgZCCthEjk5r6kuKdwWZmZW4uXkgqRpviEOZE0gJOLb87 bCmkhuXHi0ku3t0HsPWkI5Lt3SqH0uo/41a6qBPH5fo0d6V+RimAc/3/CeSCwTJH M0f5JBEcL7TdILNaNQdwLd0c5gyRoosNU6O6GnTou4Fl6NkiBWWBIikriyDP5eXX dXP/ReZJ//4FKNj/KiiFsNXXNHPH6R+S7ez1KTIp6e2PcZ3f8XlWJuKO924t5bxf ewOVDNnQiXD3N3EWvJWHC1YjAKnp0x5Moy4jrKw9Ti51y28jXV65aUW8+L4PMp3j v9JUU3uvCIR1vobqUtIp867UP/KI4/jrtJ0ma9OBBw4KJOcjnVZVeB2g230eE4Iy ScpUvWyBVZBssgllid36FcwggL3wHXsdO+NH+EbsNzmhmJlx+GQwQVsKZmYqhkl5 Fgbwxx1oD76tWVKpsByj5lrxJsJLXHftgKzEDh7RzQumSrbpLTE= =VbqB -----END PGP SIGNATURE----- --k5dl6NC2QUxdYVH3dLuNpue1f1aXqx8i9--