[libvirt] [PATCH V5] support offline migration
Daniel P. Berrange
berrange at redhat.com
Fri Sep 7 11:59:05 UTC 2012
On Thu, Sep 06, 2012 at 01:24:45PM +0800, liguang wrote:
> original migration did not aware of offline case,
> so, add code to support offline migration quietly
> (did not disturb original migration) by pass
> VIR_MIGRATE_OFFLINE flag to migration APIs, and
> migration process will not puzzeled by domain
> offline and exit unexpectly.
IIUC, if you pass VIR_MIGRATE_OFFLINE and the guest is not running,
this API is more or less a no-op. Only if you add in the
VIR_MIGRATE_PERSISTENT or VIR_MIGRATE_UNDEFINE_SOURCE flag will
anything actually be done.
> these changes did not take care of disk images the
> domain required, for disk images could be transfered
> by other APIs as suggested.
> so, the migration result is just make domain
> definition alive at target side.
But only if VIR_MIGRATE_PERSISTENT is set, right ?
> Signed-off-by: liguang <lig.fnst at cn.fujitsu.com>
> ---
> include/libvirt/libvirt.h.in | 1 +
> src/qemu/qemu_driver.c | 8 +++++
> src/qemu/qemu_migration.c | 63 ++++++++++++++++++++++++++++++++++++-----
> src/qemu/qemu_migration.h | 3 +-
> tools/virsh-domain.c | 4 ++
> 5 files changed, 70 insertions(+), 9 deletions(-)
>
> diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
> index cfe5047..77df2ab 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 b12d9bc..0ed7053 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -9641,6 +9641,8 @@ qemuDomainMigrateBegin3(virDomainPtr domain,
> }
>
> if (!virDomainObjIsActive(vm)) {
> + if (flags |= VIR_MIGRATE_OFFLINE)
> + goto offline;
This doesn't make sense - it should be '&' not '|='.
> virReportError(VIR_ERR_OPERATION_INVALID,
> "%s", _("domain is not running"));
> goto endjob;
> @@ -9653,6 +9655,7 @@ qemuDomainMigrateBegin3(virDomainPtr domain,
> if (qemuDomainCheckEjectableMedia(driver, vm, asyncJob) < 0)
> goto endjob;
>
> +offline:
> if (!(xml = qemuMigrationBegin(driver, vm, xmlin, dname,
> cookieout, cookieoutlen,
> flags)))
> @@ -9888,6 +9891,11 @@ qemuDomainMigrateConfirm3(virDomainPtr domain,
> goto cleanup;
> }
>
> + if (flags & VIR_MIGRATE_OFFLINE) {
> + ret = 0;
> + goto cleanup;
> + }
> +
> if (!qemuMigrationJobIsActive(vm, QEMU_ASYNC_JOB_MIGRATION_OUT))
> goto cleanup;
>
> diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
> index 1b21ef6..cf140d4 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 +441,12 @@ qemuMigrationCookieXMLFormat(struct qemud_driver *driver,
> virBufferAdjustIndent(buf, -2);
> }
>
> + if (mig->flags & QEMU_MIGRATION_COOKIE_OFFLINE) {
> + virBufferAsprintf(buf, " <offline mig_ol='%d'>\n",
> + 1);
> + virBufferAddLit(buf, " </offline>\n");
> + }
The 'mig_ol' attribute appears to be entirely pointless.
> +
> virBufferAddLit(buf, "</qemu-migration>\n");
> return 0;
> }
> @@ -662,6 +670,18 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
> VIR_FREE(nodes);
> }
>
> + if ((flags & QEMU_MIGRATION_COOKIE_OFFLINE) &&
> + virXPathBoolean("count(./offline) > 0", ctxt)) {
> + int offline = 0;
> + if (virXPathInt("string(./offline/@mig_ol)", ctxt, &offline) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + "%s", _("missing mig_ol attribute in migration data"));
> + goto error;
> + }
This just re-inforces it. The existance of <offline/> is enough to show
that this was offline.
> + if (offline != 1)
> + mig->flags &= ~QEMU_MIGRATION_COOKIE_OFFLINE;
> + }
> +
> return 0;
>
> error:
> @@ -721,6 +741,10 @@ 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;
>
> @@ -1151,6 +1175,13 @@ 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,
> @@ -1314,6 +1345,15 @@ 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
> */
> @@ -1856,7 +1896,8 @@ 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;
> @@ -2372,6 +2413,8 @@ 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;
>
> @@ -2477,7 +2520,7 @@ finish:
> vm->def->name);
>
> cleanup:
> - if (ddomain) {
> + if (ddomain || (flags & VIR_MIGRATE_OFFLINE)) {
> virObjectUnref(ddomain);
> ret = 0;
> } else {
> @@ -2554,10 +2597,9 @@ 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;
> }
Huh, why are you removing this goto ?
Daniel
--
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