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bh=tEhdwlmCNfXmfkMiOXRvqawPlHLjgpOLHng3N/SsIAs=; b=aZF+ePY7B4a1BKgIdSOmm6Gy54LQ3L4Mo44L6IlNjvEAYqDU59eQE8nTTxnlUu9mMEAl6W q4ISMcm08joI9ABYptTpY4tpJ5Ak3rHhft8n0ThuelhuxJ+7gPemDM3+JYP6xAON1QSB+S 3/90CkzahqpR7+NOdXWqcEU7MK5jEcE= X-MC-Unique: OzgeMS-xNgy9YrZNkI9deQ-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PATCH] migration: do not restart VM after successful snapshot-load Date: Tue, 4 May 2021 12:58:26 -0400 Message-Id: <20210504165826.618801-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.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; Received-SPF: pass client-ip=216.205.24.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.697, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: dgilbert@redhat.com, qemu-stable@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" The HMP loadvm code is calling load_snapshot rather than qmp_snapshot_load, in order to bypass the job infrastructure. The code around it is almost the same, with one difference: hmp_loadvm is restarting the VM if load_snapshot fails, qmp_snapshot_load is doing so if load_snapshot succeeds. Fix the bug in QMP by moving the common code to load_snapshot. Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini Reviewed-by: Eric Blake --- migration/savevm.c | 16 ++++++++-------- monitor/hmp-cmds.c | 7 +------ 2 files changed, 9 insertions(+), 14 deletions(-) diff --git a/migration/savevm.c b/migration/savevm.c index 52e2d72e4b..a899191cbf 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2992,6 +2992,7 @@ bool load_snapshot(const char *name, const char *vmst= ate, int ret; AioContext *aio_context; MigrationIncomingState *mis =3D migration_incoming_get_current(); + int saved_vm_running =3D runstate_is_running(); =20 if (!bdrv_all_can_snapshot(has_devices, devices, errp)) { return false; @@ -3024,6 +3025,8 @@ bool load_snapshot(const char *name, const char *vmst= ate, return false; } =20 + vm_stop(RUN_STATE_RESTORE_VM); + /* * Flush the record/replay queue. Now the VM state is going * to change. Therefore we don't need to preserve its consistency @@ -3061,13 +3064,17 @@ bool load_snapshot(const char *name, const char *vm= state, =20 if (ret < 0) { error_setg(errp, "Error %d while loading VM state", ret); - return false; + goto err_restart; } =20 return true; =20 err_drain: bdrv_drain_all_end(); +err_restart: + if (saved_vm_running) { + vm_start(); + } return false; } =20 @@ -3135,17 +3142,10 @@ static void snapshot_load_job_bh(void *opaque) { Job *job =3D opaque; SnapshotJob *s =3D container_of(job, SnapshotJob, common); - int orig_vm_running; =20 job_progress_set_remaining(&s->common, 1); =20 - orig_vm_running =3D runstate_is_running(); - vm_stop(RUN_STATE_RESTORE_VM); - s->ret =3D load_snapshot(s->tag, s->vmstate, true, s->devices, s->errp= ); - if (s->ret && orig_vm_running) { - vm_start(); - } =20 job_progress_update(&s->common, 1); =20 diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 0ad5b77477..a39436c8cb 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -1127,15 +1127,10 @@ void hmp_balloon(Monitor *mon, const QDict *qdict) =20 void hmp_loadvm(Monitor *mon, const QDict *qdict) { - int saved_vm_running =3D runstate_is_running(); const char *name =3D qdict_get_str(qdict, "name"); Error *err =3D NULL; =20 - vm_stop(RUN_STATE_RESTORE_VM); - - if (!load_snapshot(name, NULL, false, NULL, &err) && saved_vm_running)= { - vm_start(); - } + load_snapshot(name, NULL, false, NULL, &err); hmp_handle_error(mon, err); } =20 --=20 2.26.2