Re: [libvirt] [PATCH v11] support offline migration

ping ... 在 2012-10-18四的 08:42 +0800，liguang写道： > original migration did not aware of offline case, > so, try to support offline migration quietly > (did not disturb original migration) by pass > VIR_MIGRATE_OFFLINE flag to migration APIs if only > the domain is really inactive, and > migration process will not puzzled by domain > offline and exit unexpectedly. > these changes did not take care of disk images the > domain required, for them could be transferred by > other APIs as suggested, then VIR_MIGRATE_OFFLINE > should not combined with VIR_MIGRATE_NON_SHARED_*. > if you want a persistent migration, > you should do "virsh migrate --persistent" youself. > > Signed-off-by: liguang <lig.fnst(a)cn.fujitsu.com&gt; > --- > include/libvirt/libvirt.h.in | 1 + > src/qemu/qemu_driver.c | 15 ++++++++++ > src/qemu/qemu_migration.c | 60 +++++++++++++++++++++++++++++++++++------ > src/qemu/qemu_migration.h | 3 +- > tools/virsh-domain.c | 6 ++++ > 5 files changed, 75 insertions(+), 10 deletions(-) > > diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in > index 81f12a4..1cebc21 100644 > --- a/include/libvirt/libvirt.h.in > +++ b/include/libvirt/libvirt.h.in > @@ -995,6 +995,7 @@ typedef enum { > * whole migration process; this will be used automatically > * when supported */ > VIR_MIGRATE_UNSAFE = (1 << 9), /* force migration even if it is considered unsafe */ > + VIR_MIGRATE_OFFLINE = (1 << 10), /* offline migrate */ > } virDomainMigrateFlags; > > /* Domain migration. */ > diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c > index 97ad23e..38bfcab 100644 > --- a/src/qemu/qemu_driver.c > +++ b/src/qemu/qemu_driver.c > @@ -9622,6 +9622,20 @@ qemuDomainMigrateBegin3(virDomainPtr domain, > } > > if (!virDomainObjIsActive(vm)) { > + if (flags & VIR_MIGRATE_OFFLINE) { > + if (flags & (VIR_MIGRATE_NON_SHARED_DISK| > + VIR_MIGRATE_NON_SHARED_INC)) { > + virReportError(VIR_ERR_OPERATION_INVALID, > + "%s", _("migrating storage handled by volume APIs")); > + goto endjob; > + } > + if (!(flags & VIR_MIGRATE_PERSIST_DEST)) { > + virReportError(VIR_ERR_OPERATION_INVALID, > + "%s", _("VIR_MIGRATE_OFFLINE should combined with VIR_MIGRATE_PERSIST_DEST")); > + goto endjob; > + } > + goto offline; > + } > virReportError(VIR_ERR_OPERATION_INVALID, > "%s", _("domain is not running")); > goto endjob; > @@ -9634,6 +9648,7 @@ qemuDomainMigrateBegin3(virDomainPtr domain, > if (qemuDomainCheckEjectableMedia(driver, vm, asyncJob) < 0) > goto endjob; > > +offline: > if (!(xml = qemuMigrationBegin(driver, vm, xmlin, dname, > cookieout, cookieoutlen, > flags))) > diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c > index db69a0a..b2f921e 100644 > --- a/src/qemu/qemu_migration.c > +++ b/src/qemu/qemu_migration.c > @@ -70,6 +70,7 @@ enum qemuMigrationCookieFlags { > QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS, > QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE, > QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT, > + QEMU_MIGRATION_COOKIE_FLAG_OFFLINE, > > QEMU_MIGRATION_COOKIE_FLAG_LAST > }; > @@ -77,12 +78,13 @@ enum qemuMigrationCookieFlags { > VIR_ENUM_DECL(qemuMigrationCookieFlag); > VIR_ENUM_IMPL(qemuMigrationCookieFlag, > QEMU_MIGRATION_COOKIE_FLAG_LAST, > - "graphics", "lockstate", "persistent"); > + "graphics", "lockstate", "persistent", "offline"); > > enum qemuMigrationCookieFeatures { > QEMU_MIGRATION_COOKIE_GRAPHICS = (1 << QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS), > QEMU_MIGRATION_COOKIE_LOCKSTATE = (1 << QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE), > QEMU_MIGRATION_COOKIE_PERSISTENT = (1 << QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT), > + QEMU_MIGRATION_COOKIE_OFFLINE = (1 << QEMU_MIGRATION_COOKIE_FLAG_OFFLINE), > }; > > typedef struct _qemuMigrationCookieGraphics qemuMigrationCookieGraphics; > @@ -439,6 +441,9 @@ qemuMigrationCookieXMLFormat(struct qemud_driver *driver, > virBufferAdjustIndent(buf, -2); > } > > + if (mig->flags & QEMU_MIGRATION_COOKIE_OFFLINE) > + virBufferAsprintf(buf, " <offline/>\n"); > + > virBufferAddLit(buf, "</qemu-migration>\n"); > return 0; > } > @@ -662,6 +667,11 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig, > VIR_FREE(nodes); > } > > + if ((flags & QEMU_MIGRATION_COOKIE_OFFLINE)) { > + if (virXPathBoolean("count(./offline) > 0", ctxt)) > + mig->flags |= QEMU_MIGRATION_COOKIE_OFFLINE; > + } > + > return 0; > > error: > @@ -721,6 +731,10 @@ qemuMigrationBakeCookie(qemuMigrationCookiePtr mig, > qemuMigrationCookieAddPersistent(mig, dom) < 0) > return -1; > > + if (flags & QEMU_MIGRATION_COOKIE_OFFLINE) { > + mig->flags |= QEMU_MIGRATION_COOKIE_OFFLINE; > + } > + > if (!(*cookieout = qemuMigrationCookieXMLFormatStr(driver, mig))) > return -1; > > @@ -1168,6 +1182,13 @@ char *qemuMigrationBegin(struct qemud_driver *driver, > QEMU_MIGRATION_COOKIE_LOCKSTATE) < 0) > goto cleanup; > > + if (flags & VIR_MIGRATE_OFFLINE) { > + if (qemuMigrationBakeCookie(mig, driver, vm, > + cookieout, cookieoutlen, > + QEMU_MIGRATION_COOKIE_OFFLINE) < 0) > + goto cleanup; > + } > + > if (xmlin) { > if (!(def = virDomainDefParseString(driver->caps, xmlin, > QEMU_EXPECTED_VIRT_TYPES, > @@ -1331,6 +1352,15 @@ qemuMigrationPrepareAny(struct qemud_driver *driver, > goto endjob; > } > > + if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen, > + QEMU_MIGRATION_COOKIE_OFFLINE))) > + return ret; > + > + if (mig->flags & QEMU_MIGRATION_COOKIE_OFFLINE) { > + ret = 0; > + goto cleanup; > + } > + > /* Start the QEMU daemon, with the same command-line arguments plus > * -incoming $migrateFrom > */ > @@ -1873,7 +1903,8 @@ qemuMigrationRun(struct qemud_driver *driver, > virLockManagerPluginGetName(driver->lockManager)); > return -1; > } > - > + if (flags & VIR_MIGRATE_OFFLINE) > + return 0; > if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen, > QEMU_MIGRATION_COOKIE_GRAPHICS))) > goto cleanup; > @@ -2389,6 +2420,8 @@ static int doPeer2PeerMigrate3(struct qemud_driver *driver, > qemuDomainObjExitRemoteWithDriver(driver, vm); > } > VIR_FREE(dom_xml); > + if (flags & VIR_MIGRATE_OFFLINE) > + goto cleanup; > if (ret == -1) > goto cleanup; > > @@ -2494,7 +2527,7 @@ finish: > vm->def->name); > > cleanup: > - if (ddomain) { > + if (ddomain || (flags & VIR_MIGRATE_OFFLINE)) { > virObjectUnref(ddomain); > ret = 0; > } else { > @@ -2571,7 +2604,7 @@ static int doPeer2PeerMigrate(struct qemud_driver *driver, > } > > /* domain may have been stopped while we were talking to remote daemon */ > - if (!virDomainObjIsActive(vm)) { > + if (!virDomainObjIsActive(vm) && !(flags & VIR_MIGRATE_OFFLINE)) { > virReportError(VIR_ERR_INTERNAL_ERROR, "%s", > _("guest unexpectedly quit")); > goto cleanup; > @@ -2634,7 +2667,7 @@ qemuMigrationPerformJob(struct qemud_driver *driver, > if (qemuMigrationJobStart(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT) < 0) > goto cleanup; > > - if (!virDomainObjIsActive(vm)) { > + if (!virDomainObjIsActive(vm) && !(flags & VIR_MIGRATE_OFFLINE)) { > virReportError(VIR_ERR_OPERATION_INVALID, > "%s", _("domain is not running")); > goto endjob; > @@ -2958,6 +2991,8 @@ qemuMigrationFinish(struct qemud_driver *driver, > */ > if (retcode == 0) { > if (!virDomainObjIsActive(vm)) { > + if (flags & VIR_MIGRATE_OFFLINE) > + goto offline; > virReportError(VIR_ERR_INTERNAL_ERROR, "%s", > _("guest unexpectedly quit")); > goto endjob; > @@ -2973,6 +3008,7 @@ qemuMigrationFinish(struct qemud_driver *driver, > goto endjob; > } > > + offline: > if (flags & VIR_MIGRATE_PERSIST_DEST) { > virDomainDefPtr vmdef; > if (vm->persistent) > @@ -3020,7 +3056,7 @@ qemuMigrationFinish(struct qemud_driver *driver, > event = NULL; > } > > - if (!(flags & VIR_MIGRATE_PAUSED)) { > + if (!(flags & VIR_MIGRATE_PAUSED) && !(flags & VIR_MIGRATE_OFFLINE)) { > /* run 'cont' on the destination, which allows migration on qemu > * >= 0.10.6 to work properly. This isn't strictly necessary on > * older qemu's, but it also doesn't hurt anything there > @@ -3069,9 +3105,11 @@ qemuMigrationFinish(struct qemud_driver *driver, > VIR_DOMAIN_EVENT_SUSPENDED, > VIR_DOMAIN_EVENT_SUSPENDED_PAUSED); > } > - if (virDomainSaveStatus(driver->caps, driver->stateDir, vm) < 0) { > - VIR_WARN("Failed to save status on vm %s", vm->def->name); > - goto endjob; > + if (virDomainObjIsActive(vm)) { > + if (virDomainSaveStatus(driver->caps, driver->stateDir, vm) < 0) { > + VIR_WARN("Failed to save status on vm %s", vm->def->name); > + goto endjob; > + } > } > > /* Guest is successfully running, so cancel previous auto destroy */ > @@ -3091,6 +3129,7 @@ qemuMigrationFinish(struct qemud_driver *driver, > endjob: > if (qemuMigrationJobFinish(driver, vm) == 0) { > vm = NULL; > + } else if (flags & VIR_MIGRATE_OFFLINE) { > } else if (!vm->persistent && !virDomainObjIsActive(vm)) { > qemuDomainRemoveInactive(driver, vm); > vm = NULL; > @@ -3137,6 +3176,8 @@ int qemuMigrationConfirm(struct qemud_driver *driver, > > if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen, 0))) > return -1; > + if (flags & VIR_MIGRATE_OFFLINE) > + goto offline; > > /* Did the migration go as planned? If yes, kill off the > * domain object, but if no, resume CPUs > @@ -3173,6 +3214,7 @@ int qemuMigrationConfirm(struct qemud_driver *driver, > } > } > > +offline: > qemuMigrationCookieFree(mig); > rv = 0; > > diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h > index 7a2269a..b4f6a77 100644 > --- a/src/qemu/qemu_migration.h > +++ b/src/qemu/qemu_migration.h > @@ -36,7 +36,8 @@ > VIR_MIGRATE_NON_SHARED_DISK | \ > VIR_MIGRATE_NON_SHARED_INC | \ > VIR_MIGRATE_CHANGE_PROTECTION | \ > - VIR_MIGRATE_UNSAFE) > + VIR_MIGRATE_UNSAFE | \ > + VIR_MIGRATE_OFFLINE) > > enum qemuMigrationJobPhase { > QEMU_MIGRATION_PHASE_NONE = 0, > diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c > index 505169b..2218379 100644 > --- a/tools/virsh-domain.c > +++ b/tools/virsh-domain.c > @@ -6647,6 +6647,7 @@ static const vshCmdOptDef opts_migrate[] = { > {"dname", VSH_OT_DATA, 0, N_("rename to new name during migration (if supported)")}, > {"timeout", VSH_OT_INT, 0, N_("force guest to suspend if live migration exceeds timeout (in seconds)")}, > {"xml", VSH_OT_STRING, 0, N_("filename containing updated XML for the target")}, > + {"offline", VSH_OT_BOOL, 0, N_("for offline migration")}, > {NULL, 0, 0, NULL} > }; > > @@ -6713,6 +6714,11 @@ doMigrate(void *opaque) > if (vshCommandOptBool(cmd, "unsafe")) > flags |= VIR_MIGRATE_UNSAFE; > > + if (vshCommandOptBool(cmd, "offline")) { > + if (!virDomainIsActive(dom)) > + flags |= VIR_MIGRATE_OFFLINE; > + } > + > if (xmlfile && > virFileReadAll(xmlfile, 8192, &xml) < 0) { > vshError(ctl, _("file '%s' doesn't exist"), xmlfile);