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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 22 Apr 2019 08:03:50 +0100 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3M73nOZ49938608 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Apr 2019 07:03:49 GMT Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 10D5613604F; Mon, 22 Apr 2019 07:03:49 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7B4C5136051; Mon, 22 Apr 2019 07:03:46 +0000 (GMT) Received: from [127.0.1.1] (unknown [9.199.63.199]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 22 Apr 2019 07:03:46 +0000 (GMT) From: Aravinda Prasad To: aik@au1.ibm.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, david@gibson.dropbear.id.au Date: Mon, 22 Apr 2019 12:33:45 +0530 In-Reply-To: <155591636364.20338.844048953355207313.stgit@aravinda> References: <155591636364.20338.844048953355207313.stgit@aravinda> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 x-cbid: 19042207-0016-0000-0000-000009A37CEB X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010972; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000285; SDB=6.01192628; UDB=6.00625138; IPR=6.00973446; MB=3.00026542; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-22 07:03:51 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19042207-0017-0000-0000-000042E849C7 Message-Id: <155591662496.20338.3862565585716109724.stgit@aravinda> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-21_08:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=993 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904220053 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH v8 6/6] migration: Block migration while handling machine check 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: paulus@ozlabs.org, aravinda@linux.vnet.ibm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Block VM migration requests until the machine check error handling is complete as (i) these errors are specific to the source hardware and is irrelevant on the target hardware, (ii) these errors cause data corruption and should be handled before migration. Signed-off-by: Aravinda Prasad --- hw/ppc/spapr_events.c | 17 +++++++++++++++++ hw/ppc/spapr_rtas.c | 4 ++++ include/hw/ppc/spapr.h | 3 +++ 3 files changed, 24 insertions(+) diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c index 4032db0..45b990c 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -41,6 +41,7 @@ #include "qemu/bcd.h" #include "hw/ppc/spapr_ovec.h" #include +#include "migration/blocker.h" =20 #define RTAS_LOG_VERSION_MASK 0xff000000 #define RTAS_LOG_VERSION_6 0x06000000 @@ -864,6 +865,22 @@ static void spapr_mce_dispatch_elog(PowerPCCPU *cpu, b= ool recovered) void spapr_mce_req_event(PowerPCCPU *cpu, bool recovered) { SpaprMachineState *spapr =3D SPAPR_MACHINE(qdev_get_machine()); + int ret; + Error *local_err =3D NULL; + + error_setg(&spapr->migration_blocker, + "Live migration not supported during machine check handling"); + ret =3D migrate_add_blocker(spapr->migration_blocker, &local_err); + if (ret < 0) { + /* + * We don't want to abort and let the migration to continue. In a + * rare case, the machine check handler will run on the target + * hardware. Though this is not preferable, it is better than abor= ting + * the migration or killing the VM. + */ + error_free(spapr->migration_blocker); + fprintf(stderr, "Warning: Machine check during VM migration\n"); + } =20 while (spapr->mc_status !=3D -1) { /* diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 997cf19..1229a0e 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -50,6 +50,7 @@ #include "target/ppc/mmu-hash64.h" #include "target/ppc/mmu-book3s-v3.h" #include "kvm_ppc.h" +#include "migration/blocker.h" =20 static void rtas_display_character(PowerPCCPU *cpu, SpaprMachineState *spa= pr, uint32_t token, uint32_t nargs, @@ -396,6 +397,9 @@ static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu, spapr->mc_status =3D -1; qemu_cond_signal(&spapr->mc_delivery_cond); rtas_st(rets, 0, RTAS_OUT_SUCCESS); + migrate_del_blocker(spapr->migration_blocker); + error_free(spapr->migration_blocker); + spapr->migration_blocker =3D NULL; } } =20 diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 9d16ad1..dda5fd2 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -10,6 +10,7 @@ #include "hw/ppc/spapr_irq.h" #include "hw/ppc/spapr_xive.h" /* For SpaprXive */ #include "hw/ppc/xics.h" /* For ICSState */ +#include "qapi/error.h" =20 struct SpaprVioBus; struct SpaprPhbState; @@ -213,6 +214,8 @@ struct SpaprMachineState { SpaprCapabilities def, eff, mig; =20 unsigned gpu_numa_id; + + Error *migration_blocker; }; =20 #define H_SUCCESS 0