Re: [libvirt] [PATCH v3 2/2] qemu: migration: new migration param for persistent destination XML

Migration API allows to specify a destination domain configuration. Offline domain has only inactive XML and it is replaced by configuration specified using VIR_MIGRATE_PARAM_DEST_XML param. In case of live migration VIR_MIGRATE_PARAM_DEST_XML param is applied for active XML. This commit introduces the new VIR_MIGRATE_PARAM_DEST_PERSIST_XML param

that can be used within live migration to replace persistent/inactive configuration. Required for: https://bugzilla.redhat.com/show_bug.cgi?id=835300 --- include/libvirt/libvirt-domain.h | 15 +++++++++++++ src/qemu/qemu_driver.c | 12 ++++++---- src/qemu/qemu_migration.c | 47 ++++++++++++++++++++++++++-------------- src/qemu/qemu_migration.h | 2 ++ 4 files changed, 56 insertions(+), 20 deletions(-) diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h index 4ac29cd..f9dae22 100644 --- a/include/libvirt/libvirt-domain.h +++ b/include/libvirt/libvirt-domain.h @@ -723,6 +723,21 @@ typedef enum { # define VIR_MIGRATE_PARAM_DEST_XML "destination_xml" /** + * VIR_MIGRATE_PARAM_PERSIST_XML: + * + * virDomainMigrate* params field: the new persistant configuration to be used + * for the domain on the destination host as VIR_TYPED_PARAM_STRING. + * This field cannot be used to rename the domain during migration (use + * VIR_MIGRATE_PARAM_DEST_NAME field for that purpose). Domain name in the + * destination XML must match the original domain name. + * + * Omitting this parameter keeps the original domain persistent configuration. + * Using this field with hypervisors that do not support changing domain + * configuration during migration will result in a failure. + */ +# define VIR_MIGRATE_PARAM_PERSIST_XML "persistent_xml" + +/** * VIR_MIGRATE_PARAM_BANDWIDTH: * * virDomainMigrate* params field: the maximum bandwidth (in MiB/s) that will diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index ff01012..e9a16b1 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -12066,7 +12066,7 @@ qemuDomainMigratePerform(virDomainPtr dom, * * Consume any cookie we were able to decode though */ - ret = qemuMigrationPerform(driver, dom->conn, vm, + ret = qemuMigrationPerform(driver, dom->conn, vm, NULL, NULL, dconnuri, uri, NULL, NULL, 0, NULL, 0, cookie, cookielen, NULL, NULL, /* No output cookies in v2 */ @@ -12455,7 +12455,7 @@ qemuDomainMigratePerform3(virDomainPtr dom, return -1; } - return qemuMigrationPerform(driver, dom->conn, vm, xmlin, + return qemuMigrationPerform(driver, dom->conn, vm, xmlin, NULL, dconnuri, uri, NULL, NULL, 0, NULL, 0, cookiein, cookieinlen, cookieout, cookieoutlen, @@ -12476,6 +12476,7 @@ qemuDomainMigratePerform3Params(virDomainPtr dom, virQEMUDriverPtr driver = dom->conn->privateData; virDomainObjPtr vm; const char *dom_xml = NULL; + const char *persist_xml = NULL; const char *dname = NULL; const char *uri = NULL; const char *graphicsuri = NULL; @@ -12510,7 +12511,10 @@ qemuDomainMigratePerform3Params(virDomainPtr dom, &listenAddress) < 0 || virTypedParamsGetInt(params, nparams, VIR_MIGRATE_PARAM_DISKS_PORT, - &nbdPort) < 0) + &nbdPort) < 0 || + virTypedParamsGetString(params, nparams, + VIR_MIGRATE_PARAM_PERSIST_XML, + &persist_xml) < 0) goto cleanup; nmigrate_disks = virTypedParamsGetStringList(params, nparams, @@ -12528,7 +12532,7 @@ qemuDomainMigratePerform3Params(virDomainPtr dom, goto cleanup; } - ret = qemuMigrationPerform(driver, dom->conn, vm, dom_xml, + ret = qemuMigrationPerform(driver, dom->conn, vm, dom_xml, persist_xml, dconnuri, uri, graphicsuri, listenAddress, nmigrate_disks, migrate_disks, nbdPort, cookiein, cookieinlen, cookieout, cookieoutlen, diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index f723a52..5624633 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -4301,6 +4301,7 @@ qemuMigrationConnect(virQEMUDriverPtr driver, static int qemuMigrationRun(virQEMUDriverPtr driver, virDomainObjPtr vm, + const char *persist_xml, const char *cookiein, int cookieinlen, char **cookieout, @@ -4315,6 +4316,7 @@ qemuMigrationRun(virQEMUDriverPtr driver, { int ret = -1; unsigned int migrate_flags = QEMU_MONITOR_MIGRATE_BACKGROUND; + virDomainDefPtr def = NULL; qemuDomainObjPrivatePtr priv = vm->privateData; qemuMigrationCookiePtr mig = NULL; qemuMigrationIOThreadPtr iothread = NULL; @@ -4566,14 +4568,20 @@ qemuMigrationRun(virQEMUDriverPtr driver, cookieFlags |= QEMU_MIGRATION_COOKIE_NETWORK | QEMU_MIGRATION_COOKIE_STATS; + if (flags & VIR_MIGRATE_PERSIST_DEST && persist_xml && + !(def = qemuMigrationPrepareDef(driver, persist_xml, NULL, NULL))) + ret = -1; + if (ret == 0 && (((flags & VIR_MIGRATE_PERSIST_DEST && - qemuMigrationCookieAddPersistent(mig, vm->newDef) < 0)) || + qemuMigrationCookieAddPersistent(mig, + def ? def : vm->newDef) < 0)) || qemuMigrationBakeCookie(mig, driver, vm, cookieout, cookieoutlen, cookieFlags) < 0)) { VIR_WARN("Unable to encode migration cookie"); } + virDomainDefFree(def); qemuMigrationCookieFree(mig); if (events) @@ -4608,6 +4616,7 @@ qemuMigrationRun(virQEMUDriverPtr driver, */ static int doNativeMigrate(virQEMUDriverPtr driver, virDomainObjPtr vm, + const char *persist_xml, const char *uri, const char *cookiein, int cookieinlen, @@ -4666,7 +4675,7 @@ static int doNativeMigrate(virQEMUDriverPtr driver, spec.dest.host.port = uribits->port; spec.fwdType = MIGRATION_FWD_DIRECT; - ret = qemuMigrationRun(driver, vm, cookiein, cookieinlen, cookieout, + ret = qemuMigrationRun(driver, vm, persist_xml, cookiein, cookieinlen, cookieout, cookieoutlen, flags, resource, &spec, dconn, graphicsuri, nmigrate_disks, migrate_disks); @@ -4683,6 +4692,7 @@ static int doNativeMigrate(virQEMUDriverPtr driver, static int doTunnelMigrate(virQEMUDriverPtr driver, virDomainObjPtr vm, virStreamPtr st, + const char *xml_persist, const char *cookiein, int cookieinlen, char **cookieout, @@ -4727,7 +4737,7 @@ static int doTunnelMigrate(virQEMUDriverPtr driver, goto cleanup; } - ret = qemuMigrationRun(driver, vm, cookiein, cookieinlen, cookieout, + ret = qemuMigrationRun(driver, vm, xml_persist, cookiein, cookieinlen, cookieout, cookieoutlen, flags, resource, &spec, dconn, graphicsuri, nmigrate_disks, migrate_disks); @@ -4837,12 +4847,12 @@ static int doPeer2PeerMigrate2(virQEMUDriverPtr driver, VIR_DEBUG("Perform %p", sconn); qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_PERFORM2); if (flags & VIR_MIGRATE_TUNNELLED) - ret = doTunnelMigrate(driver, vm, st, + ret = doTunnelMigrate(driver, vm, st, NULL, NULL, 0, NULL, NULL, flags, resource, dconn, NULL, 0, NULL); else - ret = doNativeMigrate(driver, vm, uri_out, + ret = doNativeMigrate(driver, vm, NULL, uri_out, cookie, cookielen, NULL, NULL, /* No out cookie with v2 migration */ flags, resource, dconn, NULL, 0, NULL); @@ -4903,6 +4913,7 @@ doPeer2PeerMigrate3(virQEMUDriverPtr driver, const char *dconnuri, virDomainObjPtr vm, const char *xmlin, + const char *persist_xml, const char *dname, const char *uri, const char *graphicsuri, @@ -5073,13 +5084,13 @@ doPeer2PeerMigrate3(virQEMUDriverPtr driver, cookieout = NULL; cookieoutlen = 0; if (flags & VIR_MIGRATE_TUNNELLED) { - ret = doTunnelMigrate(driver, vm, st, + ret = doTunnelMigrate(driver, vm, st, persist_xml, cookiein, cookieinlen, &cookieout, &cookieoutlen, flags, bandwidth, dconn, graphicsuri, nmigrate_disks, migrate_disks); } else { - ret = doNativeMigrate(driver, vm, uri, + ret = doNativeMigrate(driver, vm, persist_xml, uri, cookiein, cookieinlen, &cookieout, &cookieoutlen, flags, bandwidth, dconn, graphicsuri, @@ -5252,6 +5263,7 @@ static int doPeer2PeerMigrate(virQEMUDriverPtr driver, virConnectPtr sconn, virDomainObjPtr vm, const char *xmlin, + const char *persist_xml, const char *dconnuri, const char *uri, const char *graphicsuri, @@ -5380,9 +5392,9 @@ static int doPeer2PeerMigrate(virQEMUDriverPtr driver, if (*v3proto) { ret = doPeer2PeerMigrate3(driver, sconn, dconn, dconnuri, vm, xmlin, - dname, uri, graphicsuri, listenAddress, - nmigrate_disks, migrate_disks, nbdPort, - resource, useParams, flags); + persist_xml, dname, uri, graphicsuri, + listenAddress, nmigrate_disks, migrate_disks, + nbdPort, resource, useParams, flags); } else { ret = doPeer2PeerMigrate2(driver, sconn, dconn, vm, dconnuri, flags, dname, resource); @@ -5413,6 +5425,7 @@ qemuMigrationPerformJob(virQEMUDriverPtr driver, virConnectPtr conn, virDomainObjPtr vm, const char *xmlin, + const char *persist_xml, const char *dconnuri, const char *uri, const char *graphicsuri, @@ -5453,13 +5466,13 @@ qemuMigrationPerformJob(virQEMUDriverPtr driver, qemuMigrationStoreDomainState(vm); if ((flags & (VIR_MIGRATE_TUNNELLED | VIR_MIGRATE_PEER2PEER))) { - ret = doPeer2PeerMigrate(driver, conn, vm, xmlin, + ret = doPeer2PeerMigrate(driver, conn, vm, xmlin, persist_xml, dconnuri, uri, graphicsuri, listenAddress, nmigrate_disks, migrate_disks, nbdPort, flags, dname, resource, &v3proto); } else { qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_PERFORM2); - ret = doNativeMigrate(driver, vm, uri, cookiein, cookieinlen, + ret = doNativeMigrate(driver, vm, persist_xml, uri, cookiein, cookieinlen, cookieout, cookieoutlen, flags, resource, NULL, NULL, 0, NULL); } @@ -5518,6 +5531,7 @@ static int qemuMigrationPerformPhase(virQEMUDriverPtr driver, virConnectPtr conn, virDomainObjPtr vm, + const char *persist_xml, const char *uri, const char *graphicsuri, size_t nmigrate_disks, @@ -5544,7 +5558,7 @@ qemuMigrationPerformPhase(virQEMUDriverPtr driver, virCloseCallbacksUnset(driver->closeCallbacks, vm, qemuMigrationCleanup); - ret = doNativeMigrate(driver, vm, uri, cookiein, cookieinlen, + ret = doNativeMigrate(driver, vm, persist_xml, uri, cookiein, cookieinlen, cookieout, cookieoutlen, flags, resource, NULL, graphicsuri, nmigrate_disks, migrate_disks); @@ -5583,6 +5597,7 @@ qemuMigrationPerform(virQEMUDriverPtr driver, virConnectPtr conn, virDomainObjPtr vm, const char *xmlin, + const char *persist_xml, const char *dconnuri, const char *uri, const char *graphicsuri, @@ -5617,7 +5632,7 @@ qemuMigrationPerform(virQEMUDriverPtr driver, return -1; } - return qemuMigrationPerformJob(driver, conn, vm, xmlin, dconnuri, uri, + return qemuMigrationPerformJob(driver, conn, vm, xmlin, persist_xml, dconnuri, uri, graphicsuri, listenAddress, nmigrate_disks, migrate_disks, nbdPort, cookiein, cookieinlen, @@ -5631,14 +5646,14 @@ qemuMigrationPerform(virQEMUDriverPtr driver, } if (v3proto) { - return qemuMigrationPerformPhase(driver, conn, vm, uri, + return qemuMigrationPerformPhase(driver, conn, vm, persist_xml, uri, graphicsuri, nmigrate_disks, migrate_disks, cookiein, cookieinlen, cookieout, cookieoutlen, flags, resource); } else { - return qemuMigrationPerformJob(driver, conn, vm, xmlin, NULL, + return qemuMigrationPerformJob(driver, conn, vm, xmlin, persist_xml, NULL, uri, graphicsuri, listenAddress, nmigrate_disks, migrate_disks, nbdPort, cookiein, cookieinlen, diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h index d279da4..3270d5b 100644 --- a/src/qemu/qemu_migration.h +++ b/src/qemu/qemu_migration.h @@ -54,6 +54,7 @@ VIR_MIGRATE_PARAM_MIGRATE_DISKS, VIR_TYPED_PARAM_STRING | \ VIR_TYPED_PARAM_MULTIPLE, \ VIR_MIGRATE_PARAM_DISKS_PORT, VIR_TYPED_PARAM_INT, \ + VIR_MIGRATE_PARAM_PERSIST_XML, VIR_TYPED_PARAM_STRING, \ NULL @@ -142,6 +143,7 @@ int qemuMigrationPerform(virQEMUDriverPtr driver, virConnectPtr conn, virDomainObjPtr vm, const char *xmlin, + const char *persist_xml, const char *dconnuri, const char *uri, const char *graphicsuri,