[libvirt] [PATCH V8 2/2] libxl: add migration support
Jim Fehlig
jfehlig at suse.com
Wed Jun 11 15:13:30 UTC 2014
John Ferlan wrote:
> This patch has resulted in a new Coverity warnings (looking at them was
> just lower on my list of things to do lately)...
>
> Anyway - see libxlDoMigrateReceive() and libxlDomainMigrationFinish()
> for the details...
>
Should have looked at this before responding to your patch to fix the
warnings. Does that patch fix all the issues noted below?
Regards,
Jim
> John
>
> On 06/04/2014 04:35 PM, Jim Fehlig wrote:
>
>> This patch adds initial migration support to the libxl driver,
>> using the VIR_DRV_FEATURE_MIGRATION_PARAMS family of migration
>> functions.
>>
>> Signed-off-by: Jim Fehlig <jfehlig at suse.com>
>> ---
>> po/POTFILES.in | 1 +
>> src/Makefile.am | 3 +-
>> src/libxl/libxl_conf.h | 6 +
>> src/libxl/libxl_domain.h | 1 +
>> src/libxl/libxl_driver.c | 235 ++++++++++++++++++
>> src/libxl/libxl_migration.c | 585 ++++++++++++++++++++++++++++++++++++++++++++
>> src/libxl/libxl_migration.h | 79 ++++++
>> 7 files changed, 909 insertions(+), 1 deletion(-)
>>
>> diff --git a/po/POTFILES.in b/po/POTFILES.in
>> index cff92d9..2ee7225 100644
>> --- a/po/POTFILES.in
>> +++ b/po/POTFILES.in
>> @@ -74,6 +74,7 @@ src/lxc/lxc_process.c
>> src/libxl/libxl_domain.c
>> src/libxl/libxl_driver.c
>> src/libxl/libxl_conf.c
>> +src/libxl/libxl_migration.c
>> src/network/bridge_driver.c
>> src/network/bridge_driver_linux.c
>> src/network/leaseshelper.c
>> diff --git a/src/Makefile.am b/src/Makefile.am
>> index d82ca26..01af164 100644
>> --- a/src/Makefile.am
>> +++ b/src/Makefile.am
>> @@ -707,7 +707,8 @@ XENAPI_DRIVER_SOURCES = \
>> LIBXL_DRIVER_SOURCES = \
>> libxl/libxl_conf.c libxl/libxl_conf.h \
>> libxl/libxl_domain.c libxl/libxl_domain.h \
>> - libxl/libxl_driver.c libxl/libxl_driver.h
>> + libxl/libxl_driver.c libxl/libxl_driver.h \
>> + libxl/libxl_migration.c libxl/libxl_migration.h
>>
>> UML_DRIVER_SOURCES = \
>> uml/uml_conf.c uml/uml_conf.h \
>> diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
>> index 433d6da..6aa36d2 100644
>> --- a/src/libxl/libxl_conf.h
>> +++ b/src/libxl/libxl_conf.h
>> @@ -43,6 +43,9 @@
>> # define LIBXL_VNC_PORT_MIN 5900
>> # define LIBXL_VNC_PORT_MAX 65535
>>
>> +# define LIBXL_MIGRATION_PORT_MIN 49152
>> +# define LIBXL_MIGRATION_PORT_MAX 49216
>> +
>> # define LIBXL_CONFIG_DIR SYSCONFDIR "/libvirt/libxl"
>> # define LIBXL_AUTOSTART_DIR LIBXL_CONFIG_DIR "/autostart"
>> # define LIBXL_STATE_DIR LOCALSTATEDIR "/run/libvirt/libxl"
>> @@ -115,6 +118,9 @@ struct _libxlDriverPrivate {
>> /* Immutable pointer, self-locking APIs */
>> virPortAllocatorPtr reservedVNCPorts;
>>
>> + /* Immutable pointer, self-locking APIs */
>> + virPortAllocatorPtr migrationPorts;
>> +
>> /* Immutable pointer, lockless APIs*/
>> virSysinfoDefPtr hostsysinfo;
>> };
>> diff --git a/src/libxl/libxl_domain.h b/src/libxl/libxl_domain.h
>> index 6939008..f459fdf 100644
>> --- a/src/libxl/libxl_domain.h
>> +++ b/src/libxl/libxl_domain.h
>> @@ -69,6 +69,7 @@ struct _libxlDomainObjPrivate {
>> virChrdevsPtr devs;
>> libxl_evgen_domain_death *deathW;
>> libxlDriverPrivatePtr driver;
>> + unsigned short migrationPort;
>>
>> struct libxlDomainJobObj job;
>> };
>> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
>> index 515d5c9..9feacb1 100644
>> --- a/src/libxl/libxl_driver.c
>> +++ b/src/libxl/libxl_driver.c
>> @@ -45,6 +45,7 @@
>> #include "libxl_domain.h"
>> #include "libxl_driver.h"
>> #include "libxl_conf.h"
>> +#include "libxl_migration.h"
>> #include "xen_xm.h"
>> #include "xen_sxpr.h"
>> #include "virtypedparam.h"
>> @@ -209,6 +210,7 @@ libxlStateCleanup(void)
>> virObjectUnref(libxl_driver->xmlopt);
>> virObjectUnref(libxl_driver->domains);
>> virObjectUnref(libxl_driver->reservedVNCPorts);
>> + virObjectUnref(libxl_driver->migrationPorts);
>>
>> virObjectEventStateFree(libxl_driver->domainEventState);
>> virSysinfoDefFree(libxl_driver->hostsysinfo);
>> @@ -301,6 +303,13 @@ libxlStateInitialize(bool privileged,
>> LIBXL_VNC_PORT_MAX)))
>> goto error;
>>
>> + /* Allocate bitmap for migration port reservation */
>> + if (!(libxl_driver->migrationPorts =
>> + virPortAllocatorNew(_("migration"),
>> + LIBXL_MIGRATION_PORT_MIN,
>> + LIBXL_MIGRATION_PORT_MAX)))
>> + goto error;
>> +
>> if (!(libxl_driver->domains = virDomainObjListNew()))
>> goto error;
>>
>> @@ -4153,6 +4162,7 @@ libxlConnectSupportsFeature(virConnectPtr conn, int feature)
>>
>> switch (feature) {
>> case VIR_DRV_FEATURE_TYPED_PARAM_STRING:
>> + case VIR_DRV_FEATURE_MIGRATION_PARAMS:
>> return 1;
>> default:
>> return 0;
>> @@ -4331,6 +4341,226 @@ libxlNodeDeviceReset(virNodeDevicePtr dev)
>> return ret;
>> }
>>
>> +static char *
>> +libxlDomainMigrateBegin3Params(virDomainPtr domain,
>> + virTypedParameterPtr params,
>> + int nparams,
>> + char **cookieout ATTRIBUTE_UNUSED,
>> + int *cookieoutlen ATTRIBUTE_UNUSED,
>> + unsigned int flags)
>> +{
>> + const char *xmlin = NULL;
>> + virDomainObjPtr vm = NULL;
>> +
>> + virCheckFlags(LIBXL_MIGRATION_FLAGS, NULL);
>> + if (virTypedParamsValidate(params, nparams, LIBXL_MIGRATION_PARAMETERS) < 0)
>> + return NULL;
>> +
>> + if (virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_DEST_XML,
>> + &xmlin) < 0)
>> + return NULL;
>> +
>> + if (!(vm = libxlDomObjFromDomain(domain)))
>> + return NULL;
>> +
>> + if (virDomainMigrateBegin3ParamsEnsureACL(domain->conn, vm->def) < 0) {
>> + virObjectUnlock(vm);
>> + return NULL;
>> + }
>> +
>> + if (!virDomainObjIsActive(vm)) {
>> + virReportError(VIR_ERR_OPERATION_INVALID,
>> + "%s", _("domain is not running"));
>> + virObjectUnlock(vm);
>> + return NULL;
>> + }
>> +
>> + return libxlDomainMigrationBegin(domain->conn, vm, xmlin);
>> +}
>> +
>> +static int
>> +libxlDomainMigratePrepare3Params(virConnectPtr dconn,
>> + virTypedParameterPtr params,
>> + int nparams,
>> + const char *cookiein ATTRIBUTE_UNUSED,
>> + int cookieinlen ATTRIBUTE_UNUSED,
>> + char **cookieout ATTRIBUTE_UNUSED,
>> + int *cookieoutlen ATTRIBUTE_UNUSED,
>> + char **uri_out,
>> + unsigned int flags)
>> +{
>> + libxlDriverPrivatePtr driver = dconn->privateData;
>> + virDomainDefPtr def = NULL;
>> + const char *dom_xml = NULL;
>> + const char *dname = NULL;
>> + const char *uri_in = NULL;
>> +
>> + virCheckFlags(LIBXL_MIGRATION_FLAGS, -1);
>> + if (virTypedParamsValidate(params, nparams, LIBXL_MIGRATION_PARAMETERS) < 0)
>> + goto error;
>> +
>> + if (virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_DEST_XML,
>> + &dom_xml) < 0 ||
>> + virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_DEST_NAME,
>> + &dname) < 0 ||
>> + virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_URI,
>> + &uri_in) < 0)
>> +
>> + goto error;
>> +
>> + if (!(def = libxlDomainMigrationPrepareDef(driver, dom_xml, dname)))
>> + goto error;
>> +
>> + if (virDomainMigratePrepare3ParamsEnsureACL(dconn, def) < 0)
>> + goto error;
>> +
>> + if (libxlDomainMigrationPrepare(dconn, def, uri_in, uri_out, flags) < 0)
>> + goto error;
>> +
>> + return 0;
>> +
>> + error:
>> + virDomainDefFree(def);
>> + return -1;
>> +}
>> +
>> +static int
>> +libxlDomainMigratePerform3Params(virDomainPtr dom,
>> + const char *dconnuri,
>> + virTypedParameterPtr params,
>> + int nparams,
>> + const char *cookiein ATTRIBUTE_UNUSED,
>> + int cookieinlen ATTRIBUTE_UNUSED,
>> + char **cookieout ATTRIBUTE_UNUSED,
>> + int *cookieoutlen ATTRIBUTE_UNUSED,
>> + unsigned int flags)
>> +{
>> + libxlDriverPrivatePtr driver = dom->conn->privateData;
>> + virDomainObjPtr vm = NULL;
>> + const char *dom_xml = NULL;
>> + const char *dname = NULL;
>> + const char *uri = NULL;
>> + int ret = -1;
>> +
>> + virCheckFlags(LIBXL_MIGRATION_FLAGS, -1);
>> + if (virTypedParamsValidate(params, nparams, LIBXL_MIGRATION_PARAMETERS) < 0)
>> + goto cleanup;
>> +
>> + if (virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_DEST_XML,
>> + &dom_xml) < 0 ||
>> + virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_DEST_NAME,
>> + &dname) < 0 ||
>> + virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_URI,
>> + &uri) < 0)
>> +
>> + goto cleanup;
>> +
>> + if (!(vm = libxlDomObjFromDomain(dom)))
>> + goto cleanup;
>> +
>> + if (virDomainMigratePerform3ParamsEnsureACL(dom->conn, vm->def) < 0)
>> + goto cleanup;
>> +
>> + if (libxlDomainMigrationPerform(driver, vm, dom_xml, dconnuri,
>> + uri, dname, flags) < 0) {
>> + /* Job terminated and vm unlocked if MigrationPerform failed */
>> + vm = NULL;
>> + goto cleanup;
>> + }
>> +
>> + ret = 0;
>> +
>> + cleanup:
>> + if (vm)
>> + virObjectUnlock(vm);
>> + return ret;
>> +}
>> +
>> +static virDomainPtr
>> +libxlDomainMigrateFinish3Params(virConnectPtr dconn,
>> + virTypedParameterPtr params,
>> + int nparams,
>> + const char *cookiein ATTRIBUTE_UNUSED,
>> + int cookieinlen ATTRIBUTE_UNUSED,
>> + char **cookieout ATTRIBUTE_UNUSED,
>> + int *cookieoutlen ATTRIBUTE_UNUSED,
>> + unsigned int flags,
>> + int cancelled)
>> +{
>> + libxlDriverPrivatePtr driver = dconn->privateData;
>> + virDomainObjPtr vm = NULL;
>> + const char *dname = NULL;
>> +
>> + virCheckFlags(LIBXL_MIGRATION_FLAGS, NULL);
>> + if (virTypedParamsValidate(params, nparams, LIBXL_MIGRATION_PARAMETERS) < 0)
>> + return NULL;
>> +
>> + if (virTypedParamsGetString(params, nparams,
>> + VIR_MIGRATE_PARAM_DEST_NAME,
>> + &dname) < 0)
>> + return NULL;
>> +
>> + if (!dname ||
>> + !(vm = virDomainObjListFindByName(driver->domains, dname))) {
>> + /* Migration obviously failed if the domain doesn't exist */
>> + virReportError(VIR_ERR_OPERATION_FAILED,
>> + _("Migration failed. No domain on destination host "
>> + "with matching name '%s'"),
>> + NULLSTR(dname));
>> + return NULL;
>> + }
>> +
>> + if (virDomainMigrateFinish3ParamsEnsureACL(dconn, vm->def) < 0) {
>> + virObjectUnlock(vm);
>> + return NULL;
>> + }
>> +
>> + if (!virDomainObjIsActive(vm)) {
>> + /* Migration failed if domain is inactive */
>> + virReportError(VIR_ERR_OPERATION_FAILED,
>> + "%s", _("Migration failed. Domain is not running "
>> + "on destination host"));
>> + virObjectUnlock(vm);
>> + return NULL;
>> + }
>> +
>> + return libxlDomainMigrationFinish(dconn, vm, flags, cancelled);
>> +}
>> +
>> +static int
>> +libxlDomainMigrateConfirm3Params(virDomainPtr domain,
>> + virTypedParameterPtr params,
>> + int nparams,
>> + const char *cookiein ATTRIBUTE_UNUSED,
>> + int cookieinlen ATTRIBUTE_UNUSED,
>> + unsigned int flags,
>> + int cancelled)
>> +{
>> + libxlDriverPrivatePtr driver = domain->conn->privateData;
>> + virDomainObjPtr vm = NULL;
>> +
>> + virCheckFlags(LIBXL_MIGRATION_FLAGS, -1);
>> + if (virTypedParamsValidate(params, nparams, LIBXL_MIGRATION_PARAMETERS) < 0)
>> + return -1;
>> +
>> + if (!(vm = libxlDomObjFromDomain(domain)))
>> + return -1;
>> +
>> + if (virDomainMigrateConfirm3ParamsEnsureACL(domain->conn, vm->def) < 0) {
>> + virObjectUnlock(vm);
>> + return -1;
>> + }
>> +
>> + return libxlDomainMigrationConfirm(driver, vm, flags, cancelled);
>> +}
>> +
>>
>> static virDriver libxlDriver = {
>> .no = VIR_DRV_LIBXL,
>> @@ -4421,6 +4651,11 @@ static virDriver libxlDriver = {
>> .nodeDeviceDetachFlags = libxlNodeDeviceDetachFlags, /* 1.2.3 */
>> .nodeDeviceReAttach = libxlNodeDeviceReAttach, /* 1.2.3 */
>> .nodeDeviceReset = libxlNodeDeviceReset, /* 1.2.3 */
>> + .domainMigrateBegin3Params = libxlDomainMigrateBegin3Params, /* 1.2.3 */
>> + .domainMigratePrepare3Params = libxlDomainMigratePrepare3Params, /* 1.2.3 */
>> + .domainMigratePerform3Params = libxlDomainMigratePerform3Params, /* 1.2.3 */
>> + .domainMigrateFinish3Params = libxlDomainMigrateFinish3Params, /* 1.2.3 */
>> + .domainMigrateConfirm3Params = libxlDomainMigrateConfirm3Params, /* 1.2.3 */
>> };
>>
>> static virStateDriver libxlStateDriver = {
>> diff --git a/src/libxl/libxl_migration.c b/src/libxl/libxl_migration.c
>> new file mode 100644
>> index 0000000..9fe904e
>> --- /dev/null
>> +++ b/src/libxl/libxl_migration.c
>> @@ -0,0 +1,585 @@
>> +/*
>> + * libxl_migration.c: methods for handling migration with libxenlight
>> + *
>> + * Copyright (C) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
>> + *
>> + * This library is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU Lesser General Public
>> + * License as published by the Free Software Foundation; either
>> + * version 2.1 of the License, or (at your option) any later version.
>> + *
>> + * This library is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + * Lesser General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU Lesser General Public
>> + * License along with this library. If not, see
>> + * <http://www.gnu.org/licenses/>.
>> + *
>> + * Authors:
>> + * Jim Fehlig <jfehlig at suse.com>
>> + * Chunyan Liu <cyliu at suse.com>
>> + */
>> +
>> +#include <config.h>
>> +
>> +#include "internal.h"
>> +#include "virlog.h"
>> +#include "virerror.h"
>> +#include "virconf.h"
>> +#include "datatypes.h"
>> +#include "virfile.h"
>> +#include "viralloc.h"
>> +#include "viruuid.h"
>> +#include "vircommand.h"
>> +#include "virstring.h"
>> +#include "virobject.h"
>> +#include "rpc/virnetsocket.h"
>> +#include "libxl_domain.h"
>> +#include "libxl_driver.h"
>> +#include "libxl_conf.h"
>> +#include "libxl_migration.h"
>> +
>> +#define VIR_FROM_THIS VIR_FROM_LIBXL
>> +
>> +VIR_LOG_INIT("libxl.libxl_migration");
>> +
>> +typedef struct _libxlMigrationDstArgs {
>> + virObject parent;
>> +
>> + virConnectPtr conn;
>> + virDomainObjPtr vm;
>> + unsigned int flags;
>> +
>> + /* for freeing listen sockets */
>> + virNetSocketPtr *socks;
>> + size_t nsocks;
>> +} libxlMigrationDstArgs;
>> +
>> +static virClassPtr libxlMigrationDstArgsClass;
>> +
>> +static void
>> +libxlMigrationDstArgsDispose(void *obj)
>> +{
>> + libxlMigrationDstArgs *args = obj;
>> +
>> + VIR_FREE(args->socks);
>> +}
>> +
>> +static int
>> +libxlMigrationDstArgsOnceInit(void)
>> +{
>> + if (!(libxlMigrationDstArgsClass = virClassNew(virClassForObject(),
>> + "libxlMigrationDstArgs",
>> + sizeof(libxlMigrationDstArgs),
>> + libxlMigrationDstArgsDispose)))
>> + return -1;
>> +
>> + return 0;
>> +}
>> +
>> +VIR_ONCE_GLOBAL_INIT(libxlMigrationDstArgs)
>> +
>> +static void
>> +libxlDoMigrateReceive(virNetSocketPtr sock,
>> + int events ATTRIBUTE_UNUSED,
>> + void *opaque)
>> +{
>> + libxlMigrationDstArgs *args = opaque;
>> + virConnectPtr conn = args->conn;
>> + virDomainObjPtr vm = args->vm;
>> + virNetSocketPtr *socks = args->socks;
>> + size_t nsocks = args->nsocks;
>> + bool paused = args->flags & VIR_MIGRATE_PAUSED;
>> + libxlDriverPrivatePtr driver = conn->privateData;
>> + virNetSocketPtr client_sock;
>> + int recvfd = -1;
>> + size_t i;
>> + int ret;
>> +
>> + virNetSocketAccept(sock, &client_sock);
>>
>
> (1) Event check_return: Calling "virNetSocketAccept" without checking
> return value (as is done elsewhere 5 out of 6 times).
>
>
>> + if (client_sock == NULL) {
>> + virReportError(VIR_ERR_OPERATION_INVALID, "%s",
>> + _("Fail to accept migration connection"));
>> + goto cleanup;
>> + }
>> + VIR_DEBUG("Accepted migration connection\n");
>> + recvfd = virNetSocketDupFD(client_sock, true);
>> + virObjectUnref(client_sock);
>> +
>> + virObjectLock(vm);
>> + ret = libxlDomainStart(driver, vm, paused, recvfd);
>> + virObjectUnlock(vm);
>> +
>> + if (ret < 0 && !vm->persistent)
>> + virDomainObjListRemove(driver->domains, vm);
>> +
>> + cleanup:
>> + /* Remove all listen socks from event handler, and close them. */
>> + for (i = 0; i < nsocks; i++) {
>> + virNetSocketUpdateIOCallback(socks[i], 0);
>> + virNetSocketRemoveIOCallback(socks[i]);
>> + virNetSocketClose(socks[i]);
>> + virObjectUnref(socks[i]);
>> + socks[i] = NULL;
>> + }
>> + args->nsocks = 0;
>> + VIR_FORCE_CLOSE(recvfd);
>> +}
>> +
>> +static int
>> +libxlDoMigrateSend(libxlDriverPrivatePtr driver,
>> + virDomainObjPtr vm,
>> + unsigned long flags,
>> + int sockfd)
>> +{
>> + libxlDomainObjPrivatePtr priv;
>> + libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
>> + virObjectEventPtr event = NULL;
>> + int xl_flags = 0;
>> + int ret;
>> +
>> + if (flags & VIR_MIGRATE_LIVE)
>> + xl_flags = LIBXL_SUSPEND_LIVE;
>> +
>> + priv = vm->privateData;
>> + ret = libxl_domain_suspend(priv->ctx, vm->def->id, sockfd,
>> + xl_flags, NULL);
>> + if (ret != 0) {
>> + /* attempt to resume the domain on failure */
>> + if (libxl_domain_resume(priv->ctx, vm->def->id, 0, 0) != 0) {
>> + VIR_DEBUG("Failed to resume domain following failed migration");
>> + virDomainObjSetState(vm, VIR_DOMAIN_PAUSED,
>> + VIR_DOMAIN_PAUSED_MIGRATION);
>> + event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_SUSPENDED,
>> + VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED);
>> + ignore_value(virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm));
>> + }
>> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
>> + _("Failed to send migration data to destination host"));
>> + ret = -1;
>> + goto cleanup;
>> + }
>> +
>> + cleanup:
>> + if (event)
>> + libxlDomainEventQueue(driver, event);
>> + virObjectUnref(cfg);
>> + return ret;
>> +}
>> +
>> +static bool
>> +libxlDomainMigrationIsAllowed(virDomainDefPtr def)
>> +{
>> + /* Migration is not allowed if definition contains any hostdevs */
>> + if (def->nhostdevs > 0) {
>> + virReportError(VIR_ERR_OPERATION_INVALID, "%s",
>> + _("domain has assigned host devices"));
>> + return false;
>> + }
>> +
>> + return true;
>> +}
>> +
>> +char *
>> +libxlDomainMigrationBegin(virConnectPtr conn,
>> + virDomainObjPtr vm,
>> + const char *xmlin)
>> +{
>> + libxlDriverPrivatePtr driver = conn->privateData;
>> + libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
>> + virDomainDefPtr tmpdef = NULL;
>> + virDomainDefPtr def;
>> + char *xml = NULL;
>> +
>> + if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
>> + goto cleanup;
>> +
>> + if (xmlin) {
>> + if (!(tmpdef = virDomainDefParseString(xmlin, cfg->caps,
>> + driver->xmlopt,
>> + 1 << VIR_DOMAIN_VIRT_XEN,
>> + VIR_DOMAIN_XML_INACTIVE)))
>> + goto endjob;
>> +
>> + if (!libxlDomainDefCheckABIStability(driver, vm->def, tmpdef))
>> + goto endjob;
>> +
>> + def = tmpdef;
>> + } else {
>> + def = vm->def;
>> + }
>> +
>> + if (!libxlDomainMigrationIsAllowed(def))
>> + goto endjob;
>> +
>> + xml = virDomainDefFormat(def, VIR_DOMAIN_XML_SECURE);
>> +
>> + cleanup:
>> + if (vm)
>> + virObjectUnlock(vm);
>> +
>> + virDomainDefFree(tmpdef);
>> + virObjectUnref(cfg);
>> + return xml;
>> +
>> + endjob:
>> + if (!libxlDomainObjEndJob(driver, vm))
>> + vm = NULL;
>> + goto cleanup;
>> +}
>> +
>> +virDomainDefPtr
>> +libxlDomainMigrationPrepareDef(libxlDriverPrivatePtr driver,
>> + const char *dom_xml,
>> + const char *dname)
>> +{
>> + libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
>> + virDomainDefPtr def;
>> + char *name = NULL;
>> +
>> + if (!dom_xml) {
>> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
>> + _("no domain XML passed"));
>> + return NULL;
>> + }
>> +
>> + if (!(def = virDomainDefParseString(dom_xml, cfg->caps, driver->xmlopt,
>> + 1 << VIR_DOMAIN_VIRT_XEN,
>> + VIR_DOMAIN_XML_INACTIVE)))
>> + goto cleanup;
>> +
>> + if (dname) {
>> + name = def->name;
>> + if (VIR_STRDUP(def->name, dname) < 0) {
>> + virDomainDefFree(def);
>> + def = NULL;
>> + }
>> + }
>> +
>> + cleanup:
>> + virObjectUnref(cfg);
>> + VIR_FREE(name);
>> + return def;
>> +}
>> +
>> +int
>> +libxlDomainMigrationPrepare(virConnectPtr dconn,
>> + virDomainDefPtr def,
>> + const char *uri_in,
>> + char **uri_out,
>> + unsigned int flags)
>> +{
>> + libxlDriverPrivatePtr driver = dconn->privateData;
>> + virDomainObjPtr vm = NULL;
>> + char *hostname = NULL;
>> + unsigned short port;
>> + char portstr[100];
>> + virURIPtr uri = NULL;
>> + virNetSocketPtr *socks = NULL;
>> + size_t nsocks = 0;
>> + int nsocks_listen = 0;
>> + libxlMigrationDstArgs *args;
>> + size_t i;
>> + int ret = -1;
>> +
>> + if (!(vm = virDomainObjListAdd(driver->domains, def,
>> + driver->xmlopt,
>> + VIR_DOMAIN_OBJ_LIST_ADD_LIVE |
>> + VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE,
>> + NULL)))
>> + goto cleanup;
>> +
>> + /* Create socket connection to receive migration data */
>> + if (!uri_in) {
>> + if ((hostname = virGetHostname()) == NULL)
>> + goto cleanup;
>> +
>> + if (STRPREFIX(hostname, "localhost")) {
>> + virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
>> + _("hostname on destination resolved to localhost,"
>> + " but migration requires an FQDN"));
>> + goto cleanup;
>> + }
>> +
>> + if (virPortAllocatorAcquire(driver->migrationPorts, &port) < 0)
>> + goto cleanup;
>> +
>> + if (virAsprintf(uri_out, "tcp://%s:%d", hostname, port) < 0)
>> + goto cleanup;
>> + } else {
>> + if (!(STRPREFIX(uri_in, "tcp://"))) {
>> + /* not full URI, add prefix tcp:// */
>> + char *tmp;
>> + if (virAsprintf(&tmp, "tcp://%s", uri_in) < 0)
>> + goto cleanup;
>> + uri = virURIParse(tmp);
>> + VIR_FREE(tmp);
>> + } else {
>> + uri = virURIParse(uri_in);
>> + }
>> +
>> + if (uri == NULL) {
>> + virReportError(VIR_ERR_INVALID_ARG,
>> + _("unable to parse URI: %s"),
>> + uri_in);
>> + goto cleanup;
>> + }
>> +
>> + if (uri->server == NULL) {
>> + virReportError(VIR_ERR_INVALID_ARG,
>> + _("missing host in migration URI: %s"),
>> + uri_in);
>> + goto cleanup;
>> + } else {
>> + hostname = uri->server;
>> + }
>> +
>> + if (uri->port == 0) {
>> + if (virPortAllocatorAcquire(driver->migrationPorts, &port) < 0)
>> + goto cleanup;
>> +
>> + } else {
>> + port = uri->port;
>> + }
>> +
>> + if (virAsprintf(uri_out, "tcp://%s:%d", hostname, port) < 0)
>> + goto cleanup;
>> + }
>> +
>> + snprintf(portstr, sizeof(portstr), "%d", port);
>> +
>> + if (virNetSocketNewListenTCP(hostname, portstr, &socks, &nsocks) < 0) {
>> + virReportError(VIR_ERR_OPERATION_FAILED, "%s",
>> + _("Fail to create socket for incoming migration"));
>> + goto cleanup;
>> + }
>> +
>> + if (libxlMigrationDstArgsInitialize() < 0)
>> + goto cleanup;
>> +
>> + if (!(args = virObjectNew(libxlMigrationDstArgsClass)))
>> + goto cleanup;
>> +
>> + args->conn = dconn;
>> + args->vm = vm;
>> + args->flags = flags;
>> + args->socks = socks;
>> + args->nsocks = nsocks;
>> +
>> + for (i = 0; i < nsocks; i++) {
>> + if (virNetSocketSetBlocking(socks[i], true) < 0)
>> + continue;
>> +
>> + if (virNetSocketListen(socks[i], 1) < 0)
>> + continue;
>> +
>> + if (virNetSocketAddIOCallback(socks[i],
>> + VIR_EVENT_HANDLE_READABLE,
>> + libxlDoMigrateReceive,
>> + args,
>> + virObjectFreeCallback) < 0)
>> + continue;
>> +
>> + /*
>> + * Successfully added sock to event loop. Take a ref on args to
>> + * ensure it is not freed until sock is removed from the event loop.
>> + * Ref is dropped in virObjectFreeCallback after being removed
>> + * from the event loop.
>> + */
>> + virObjectRef(args);
>> + nsocks_listen++;
>> + }
>> +
>> + /* Done with args in this function, drop reference */
>> + virObjectUnref(args);
>> +
>> + if (!nsocks_listen)
>> + goto cleanup;
>> +
>> + ret = 0;
>> + goto done;
>> +
>> + cleanup:
>> + for (i = 0; i < nsocks; i++) {
>> + virNetSocketClose(socks[i]);
>> + virObjectUnref(socks[i]);
>> + }
>> +
>> + done:
>> + virURIFree(uri);
>> + if (vm)
>> + virObjectUnlock(vm);
>> + return ret;
>> +}
>> +
>> +int
>> +libxlDomainMigrationPerform(libxlDriverPrivatePtr driver,
>> + virDomainObjPtr vm,
>> + const char *dom_xml ATTRIBUTE_UNUSED,
>> + const char *dconnuri ATTRIBUTE_UNUSED,
>> + const char *uri_str,
>> + const char *dname ATTRIBUTE_UNUSED,
>> + unsigned int flags)
>> +{
>> + char *hostname = NULL;
>> + unsigned short port = 0;
>> + char portstr[100];
>> + virURIPtr uri = NULL;
>> + virNetSocketPtr sock;
>> + int sockfd = -1;
>> + int saved_errno = EINVAL;
>> + int ret = -1;
>> +
>> + /* parse dst host:port from uri */
>> + uri = virURIParse(uri_str);
>> + if (uri == NULL || uri->server == NULL || uri->port == 0)
>> + goto cleanup;
>> +
>> + hostname = uri->server;
>> + port = uri->port;
>> + snprintf(portstr, sizeof(portstr), "%d", port);
>> +
>> + /* socket connect to dst host:port */
>> + if (virNetSocketNewConnectTCP(hostname, portstr, &sock) < 0) {
>> + virReportSystemError(saved_errno,
>> + _("unable to connect to '%s:%s'"),
>> + hostname, portstr);
>> + goto cleanup;
>> + }
>> +
>> + if (virNetSocketSetBlocking(sock, true) < 0) {
>> + virObjectUnref(sock);
>> + goto cleanup;
>> + }
>> +
>> + sockfd = virNetSocketDupFD(sock, true);
>> + virObjectUnref(sock);
>> +
>> + /* suspend vm and send saved data to dst through socket fd */
>> + virObjectUnlock(vm);
>> + ret = libxlDoMigrateSend(driver, vm, flags, sockfd);
>> + virObjectLock(vm);
>> +
>> + cleanup:
>> + /* If failure, terminate the job started in MigrationBegin */
>> + if (ret == -1) {
>> + if (libxlDomainObjEndJob(driver, vm))
>> + virObjectUnlock(vm);
>> + }
>> + VIR_FORCE_CLOSE(sockfd);
>> + virURIFree(uri);
>> + return ret;
>> +}
>> +
>> +virDomainPtr
>> +libxlDomainMigrationFinish(virConnectPtr dconn,
>> + virDomainObjPtr vm,
>> + unsigned int flags,
>> + int cancelled)
>> +{
>> + libxlDriverPrivatePtr driver = dconn->privateData;
>> + libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
>> + libxlDomainObjPrivatePtr priv = vm->privateData;
>>
>
> The 'vm' is dereferenced here without checking for !vm, although down
> below in the cleanup: section there is a "if (vm)" done. Coverity
> throws out the following:
>
> (1) Event deref_ptr: Directly dereferencing pointer "vm".
>
>
>> + virObjectEventPtr event = NULL;
>> + virDomainPtr dom = NULL;
>> +
>> + virPortAllocatorRelease(driver->migrationPorts, priv->migrationPort);
>> + priv->migrationPort = 0;
>> +
>> + if (cancelled)
>> + goto cleanup;
>> +
>> + if (!(flags & VIR_MIGRATE_PAUSED)) {
>> + if (libxl_domain_unpause(priv->ctx, vm->def->id) != 0) {
>> + virReportError(VIR_ERR_OPERATION_FAILED, "%s",
>> + _("Failed to unpause domain"));
>> + goto cleanup;
>> + }
>> +
>> + virDomainObjSetState(vm, VIR_DOMAIN_RUNNING,
>> + VIR_DOMAIN_RUNNING_MIGRATED);
>> + event = virDomainEventLifecycleNewFromObj(vm,
>> + VIR_DOMAIN_EVENT_RESUMED,
>> + VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
>> + } else {
>> + virDomainObjSetState(vm, VIR_DOMAIN_PAUSED, VIR_DOMAIN_PAUSED_USER);
>> + event = virDomainEventLifecycleNewFromObj(vm,
>> + VIR_DOMAIN_EVENT_SUSPENDED,
>> + VIR_DOMAIN_EVENT_SUSPENDED_PAUSED);
>> + }
>> +
>> + if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm) < 0)
>> + goto cleanup;
>> +
>> + dom = virGetDomain(dconn, vm->def->name, vm->def->uuid);
>> +
>> + if (dom == NULL) {
>> + libxl_domain_destroy(priv->ctx, vm->def->id, NULL);
>> + libxlDomainCleanup(driver, vm, VIR_DOMAIN_SHUTOFF_FAILED);
>> + event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
>> + VIR_DOMAIN_EVENT_STOPPED_FAILED);
>> + libxlDomainEventQueue(driver, event);
>> + }
>> +
>> + cleanup:
>> + if (event)
>> + libxlDomainEventQueue(driver, event);
>>
>
> (2) Event check_after_deref: Null-checking "vm" suggests that it may be
> null, but it has already been dereferenced on all paths leading to the
> check.
>
>
>> + if (vm)
>> + virObjectUnlock(vm);
>> + virObjectUnref(cfg);
>> + return dom;
>> +}
>> +
>> +int
>> +libxlDomainMigrationConfirm(libxlDriverPrivatePtr driver,
>> + virDomainObjPtr vm,
>> + unsigned int flags,
>> + int cancelled)
>> +{
>> + libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
>> + libxlDomainObjPrivatePtr priv = vm->privateData;
>> + virObjectEventPtr event = NULL;
>> + int ret = -1;
>> +
>> + if (cancelled) {
>> + if (libxl_domain_resume(priv->ctx, vm->def->id, 1, 0) == 0) {
>> + ret = 0;
>> + } else {
>> + VIR_DEBUG("Unable to resume domain '%s' after failed migration",
>> + vm->def->name);
>> + virDomainObjSetState(vm, VIR_DOMAIN_PAUSED,
>> + VIR_DOMAIN_PAUSED_MIGRATION);
>> + event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_SUSPENDED,
>> + VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED);
>> + ignore_value(virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm));
>> + }
>> + goto cleanup;
>> + }
>> +
>> + libxl_domain_destroy(priv->ctx, vm->def->id, NULL);
>> + libxlDomainCleanup(driver, vm, VIR_DOMAIN_SHUTOFF_MIGRATED);
>> + event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
>> + VIR_DOMAIN_EVENT_STOPPED_MIGRATED);
>> +
>> + VIR_DEBUG("Domain '%s' successfully migrated", vm->def->name);
>> +
>> + if (flags & VIR_MIGRATE_UNDEFINE_SOURCE)
>> + virDomainDeleteConfig(cfg->configDir, cfg->autostartDir, vm);
>> +
>> + if (!vm->persistent || (flags & VIR_MIGRATE_UNDEFINE_SOURCE))
>> + virDomainObjListRemove(driver->domains, vm);
>> +
>> + ret = 0;
>> +
>> + cleanup:
>> + if (!libxlDomainObjEndJob(driver, vm))
>> + vm = NULL;
>> + if (event)
>> + libxlDomainEventQueue(driver, event);
>> + if (vm)
>> + virObjectUnlock(vm);
>> + virObjectUnref(cfg);
>> + return ret;
>> +}
>> diff --git a/src/libxl/libxl_migration.h b/src/libxl/libxl_migration.h
>> new file mode 100644
>> index 0000000..aab96f5
>> --- /dev/null
>> +++ b/src/libxl/libxl_migration.h
>> @@ -0,0 +1,79 @@
>> +/*
>> + * libxl_migration.h: methods for handling migration with libxenlight
>> + *
>> + * Copyright (c) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
>> + *
>> + * This library is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU Lesser General Public
>> + * License as published by the Free Software Foundation; either
>> + * version 2.1 of the License, or (at your option) any later version.
>> + *
>> + * This library is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + * Lesser General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU Lesser General Public
>> + * License along with this library. If not, see
>> + * <http://www.gnu.org/licenses/>.
>> + *
>> + * Authors:
>> + * Jim Fehlig <jfehlig at suse.com>
>> + */
>> +
>> +#ifndef LIBXL_MIGRATION_H
>> +# define LIBXL_MIGRATION_H
>> +
>> +# include "libxl_conf.h"
>> +
>> +# define LIBXL_MIGRATION_FLAGS \
>> + (VIR_MIGRATE_LIVE | \
>> + VIR_MIGRATE_UNDEFINE_SOURCE | \
>> + VIR_MIGRATE_PAUSED)
>> +
>> +/* All supported migration parameters and their types. */
>> +# define LIBXL_MIGRATION_PARAMETERS \
>> + VIR_MIGRATE_PARAM_URI, VIR_TYPED_PARAM_STRING, \
>> + VIR_MIGRATE_PARAM_DEST_NAME, VIR_TYPED_PARAM_STRING, \
>> + VIR_MIGRATE_PARAM_DEST_XML, VIR_TYPED_PARAM_STRING, \
>> + NULL
>> +
>> +char *
>> +libxlDomainMigrationBegin(virConnectPtr conn,
>> + virDomainObjPtr vm,
>> + const char *xmlin);
>> +
>> +virDomainDefPtr
>> +libxlDomainMigrationPrepareDef(libxlDriverPrivatePtr driver,
>> + const char *dom_xml,
>> + const char *dname);
>> +
>> +int
>> +libxlDomainMigrationPrepare(virConnectPtr dconn,
>> + virDomainDefPtr def,
>> + const char *uri_in,
>> + char **uri_out,
>> + unsigned int flags);
>> +
>> +int
>> +libxlDomainMigrationPerform(libxlDriverPrivatePtr driver,
>> + virDomainObjPtr vm,
>> + const char *dom_xml,
>> + const char *dconnuri,
>> + const char *uri_str,
>> + const char *dname,
>> + unsigned int flags);
>> +
>> +virDomainPtr
>> +libxlDomainMigrationFinish(virConnectPtr dconn,
>> + virDomainObjPtr vm,
>> + unsigned int flags,
>> + int cancelled);
>> +
>> +int
>> +libxlDomainMigrationConfirm(libxlDriverPrivatePtr driver,
>> + virDomainObjPtr vm,
>> + unsigned int flags,
>> + int cancelled);
>> +
>> +#endif /* LIBXL_DRIVER_H */
>>
>>
>
>
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