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[libvirt] [PATCH v10] support offline migration



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 cn fujitsu com>
---
 include/libvirt/libvirt.h.in |    1 +
 src/qemu/qemu_driver.c       |   10 ++++++++
 src/qemu/qemu_migration.c    |   52 +++++++++++++++++++++++++++++++++++++-----
 src/qemu/qemu_migration.h    |    3 +-
 tools/virsh-domain.c         |    6 +++++
 5 files changed, 65 insertions(+), 7 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..6189bbe 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9622,6 +9622,15 @@ 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;
+            }
+            goto offline;
+        }
         virReportError(VIR_ERR_OPERATION_INVALID,
                        "%s", _("domain is not running"));
         goto endjob;
@@ -9634,6 +9643,7 @@ 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..6845a97 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
@@ -3091,6 +3127,7 @@ 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 +3174,8 @@ 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 +3212,7 @@ 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);
-- 
1.7.2.5


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