From: Michal Privoznik Date: Thu, 20 Sep 2012 09:15:31 +0000 (+0200) Subject: qemu: wait for SPICE to migrate X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=3521cd1c328c1ac3437e6953cf05bf108ce056ab;p=people%2Fliuw%2Flibxenctrl-split%2Flibvirt.git qemu: wait for SPICE to migrate Recently, there have been some improvements made to qemu so it supports seamless migration or something very close to it. However, it requires libvirt interaction. Once qemu is migrated, the SPICE server needs to send its internal state to the destination. Once it's done, it fires SPICE_MIGRATE_COMPLETED event and this fact is advertised in 'query-spice' output as well. We must not kill qemu until SPICE server finishes the transfer. --- diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index 3b08ef859..be86014cf 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -183,6 +183,7 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST, "reboot-timeout", /* 110 */ "dump-guest-core", + "seamless-migration", ); struct _qemuCaps { @@ -1149,6 +1150,8 @@ qemuCapsComputeCmdFlags(const char *help, } if (strstr(help, "-spice")) qemuCapsSet(caps, QEMU_CAPS_SPICE); + if (strstr(help, "seamless-migration=")) + qemuCapsSet(caps, QEMU_CAPS_SEAMLESS_MIGRATION); if (strstr(help, "boot=on")) qemuCapsSet(caps, QEMU_CAPS_DRIVE_BOOT); if (strstr(help, "serial=s")) diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h index 485c2974d..9e4543aed 100644 --- a/src/qemu/qemu_capabilities.h +++ b/src/qemu/qemu_capabilities.h @@ -147,6 +147,7 @@ enum qemuCapsFlags { QEMU_CAPS_SECCOMP_SANDBOX = 109, /* -sandbox */ QEMU_CAPS_REBOOT_TIMEOUT = 110, /* -boot reboot-timeout */ QEMU_CAPS_DUMP_GUEST_CORE = 111, /* dump-guest-core-parameter */ + QEMU_CAPS_SEAMLESS_MIGRATION = 112, /* seamless-migration for SPICE */ QEMU_CAPS_LAST, /* this must always be the last item */ }; diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index e7bb88e69..4e14ae3fb 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -6150,6 +6150,14 @@ qemuBuildCommandLine(virConnectPtr conn, if (def->graphics[0]->data.spice.copypaste == VIR_DOMAIN_GRAPHICS_SPICE_CLIPBOARD_COPYPASTE_NO) virBufferAddLit(&opt, ",disable-copy-paste"); + if (qemuCapsGet(caps, QEMU_CAPS_SEAMLESS_MIGRATION)) { + /* If qemu supports seamless migration turn it + * unconditionally on. If migration destination + * doesn't support it, it fallbacks to previous + * migration algorithm silently. */ + virBufferAddLit(&opt, ",seamless-migration=on"); + } + virCommandAddArg(cmd, "-spice"); virCommandAddArgBuffer(cmd, &opt); if (def->graphics[0]->data.spice.keymap) diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index 8e8587573..db69a0aa4 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -896,10 +896,19 @@ qemuMigrationUpdateJobStatus(struct qemud_driver *driver, qemuDomainObjPrivatePtr priv = vm->privateData; int ret; int status; + bool wait_for_spice = false; + bool spice_migrated = false; unsigned long long memProcessed; unsigned long long memRemaining; unsigned long long memTotal; + /* If guest uses SPICE and supports seamles_migration we have to hold up + * migration finish until SPICE server transfers its data */ + if (vm->def->ngraphics == 1 && + vm->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE && + qemuCapsGet(priv->caps, QEMU_CAPS_SEAMLESS_MIGRATION)) + wait_for_spice = true; + ret = qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob); if (ret < 0) { /* Guest already exited; nothing further to update. */ @@ -910,6 +919,13 @@ qemuMigrationUpdateJobStatus(struct qemud_driver *driver, &memProcessed, &memRemaining, &memTotal); + + /* If qemu says migrated, check spice */ + if (wait_for_spice && (ret == 0) && + (status == QEMU_MONITOR_MIGRATION_STATUS_COMPLETED)) + ret = qemuMonitorGetSpiceMigrationStatus(priv->mon, + &spice_migrated); + qemuDomainObjExitMonitorWithDriver(driver, vm); if (ret < 0 || virTimeMillisNow(&priv->job.info.timeElapsed) < 0) { @@ -939,7 +955,8 @@ qemuMigrationUpdateJobStatus(struct qemud_driver *driver, break; case QEMU_MONITOR_MIGRATION_STATUS_COMPLETED: - priv->job.info.type = VIR_DOMAIN_JOB_COMPLETED; + if ((wait_for_spice && spice_migrated) || (!wait_for_spice)) + priv->job.info.type = VIR_DOMAIN_JOB_COMPLETED; ret = 0; break; diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index 2796a613d..58a9f945c 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -1828,6 +1828,30 @@ int qemuMonitorGetMigrationStatus(qemuMonitorPtr mon, } +int qemuMonitorGetSpiceMigrationStatus(qemuMonitorPtr mon, + bool *spice_migrated) +{ + int ret; + VIR_DEBUG("mon=%p", mon); + + if (!mon) { + virReportError(VIR_ERR_INVALID_ARG, "%s", + _("monitor must not be NULL")); + return -1; + } + + if (mon->json) { + ret = qemuMonitorJSONGetSpiceMigrationStatus(mon, spice_migrated); + } else { + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", + _("JSON monitor is required")); + return -1; + } + + return ret; +} + + int qemuMonitorMigrateToFd(qemuMonitorPtr mon, unsigned int flags, int fd) diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h index 6b4eb6f1e..3455ab9c2 100644 --- a/src/qemu/qemu_monitor.h +++ b/src/qemu/qemu_monitor.h @@ -343,6 +343,8 @@ int qemuMonitorGetMigrationStatus(qemuMonitorPtr mon, unsigned long long *transferred, unsigned long long *remaining, unsigned long long *total); +int qemuMonitorGetSpiceMigrationStatus(qemuMonitorPtr mon, + bool *spice_migrated); typedef enum { QEMU_MONITOR_MIGRATE_BACKGROUND = 1 << 0, diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index f372199e3..c55ee2bb0 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -2490,6 +2490,58 @@ int qemuMonitorJSONGetMigrationStatus(qemuMonitorPtr mon, } +static int +qemuMonitorJSONSpiceGetMigrationStatusReply(virJSONValuePtr reply, + bool *spice_migrated) +{ + virJSONValuePtr ret; + const char *migrated_str; + + if (!(ret = virJSONValueObjectGet(reply, "return"))) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("query-spice reply was missing return data")); + return -1; + } + + if (!(migrated_str = virJSONValueObjectGetString(ret, "migrated"))) { + /* Deliberately don't report error here as we are + * probably dealing with older qemu which doesn't + * report this yet. Pretend spice is migrated. */ + *spice_migrated = true; + } else { + *spice_migrated = STREQ(migrated_str, "true"); + } + + return 0; +} + + +int qemuMonitorJSONGetSpiceMigrationStatus(qemuMonitorPtr mon, + bool *spice_migrated) +{ + int ret; + virJSONValuePtr cmd = qemuMonitorJSONMakeCommand("query-spice", + NULL); + virJSONValuePtr reply = NULL; + + if (!cmd) + return -1; + + ret = qemuMonitorJSONCommand(mon, cmd, &reply); + + if (ret == 0) + ret = qemuMonitorJSONCheckError(cmd, reply); + + if (ret == 0) + ret = qemuMonitorJSONSpiceGetMigrationStatusReply(reply, + spice_migrated); + + virJSONValueFree(cmd); + virJSONValueFree(reply); + return ret; +} + + int qemuMonitorJSONMigrate(qemuMonitorPtr mon, unsigned int flags, const char *uri) diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h index e531eb182..751b81f94 100644 --- a/src/qemu/qemu_monitor_json.h +++ b/src/qemu/qemu_monitor_json.h @@ -134,6 +134,9 @@ int qemuMonitorJSONGetMigrationStatus(qemuMonitorPtr mon, int qemuMonitorJSONMigrate(qemuMonitorPtr mon, unsigned int flags, const char *uri); +int qemuMonitorJSONGetSpiceMigrationStatus(qemuMonitorPtr mon, + bool *spice_migrated); + int qemuMonitorJSONMigrateCancel(qemuMonitorPtr mon);