[libvirt] [PATCH] Add migration APIs for libxl driver
Chunyan Liu
cyliu at suse.com
Fri Mar 2 02:02:07 UTC 2012
Add migration APIs for libxl driver.
Implemented in migration version 3. Based on xen 4.1.
Signed-off-by: Chunyan Liu <cyliu at suse.com>
---
src/libxl/libxl_driver.c | 617 ++++++++++++++++++++++++++++++++++++++++++++++
src/libxl/libxl_driver.h | 17 ++-
2 files changed, 632 insertions(+), 2 deletions(-)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index d5fa64a..4037635 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -30,6 +30,12 @@
#include <math.h>
#include <libxl.h>
#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netdb.h>
#include "internal.h"
#include "logging.h"
@@ -60,6 +66,13 @@
#define XEN_SCHED_CREDIT_NPARAM 2
static libxlDriverPrivatePtr libxl_driver = NULL;
+static virThread migrate_receive_thread;
+
+typedef struct migrate_receive_args {
+ virConnectPtr conn;
+ virDomainObjPtr vm;
+ int sockfd;
+} migrate_receive_args;
/* Function declarations */
static int
@@ -1095,6 +1108,17 @@ libxlClose(virConnectPtr conn ATTRIBUTE_UNUSED)
return 0;
}
+static int
+libxlSupportsFeature(virConnectPtr conn ATTRIBUTE_UNUSED, int feature)
+{
+ switch (feature) {
+ case VIR_DRV_FEATURE_MIGRATION_V3:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
static const char *
libxlGetType(virConnectPtr conn ATTRIBUTE_UNUSED)
{
@@ -3842,12 +3866,600 @@ libxlIsAlive(virConnectPtr conn ATTRIBUTE_UNUSED)
return 1;
}
+static int libxlReadFixedMessage(int fd, const void *msg, int msgsz)
+{
+ char buf[msgsz];
+
+ if (saferead(fd, buf, msgsz) != msgsz || memcmp(buf, msg, msgsz)) {
+ return -1;
+ }
+
+ return 0;
+}
+
+static int doParseURI(const char *uri, char **p_hostname, int *p_port)
+{
+ char *p, *hostname;
+ char port[16] = "0";
+
+ if (strstr (uri, "//")) { /* Full URI. */
+ virURIPtr uriptr = virURIParse(uri);
+ if (!uriptr) {
+ libxlError(VIR_ERR_INVALID_ARG,
+ _("Invalid URI"));
+ return -1;
+ }
+ if (uriptr->scheme && STRCASENEQ(uriptr->scheme, "xlmigr")) {
+ libxlError(VIR_ERR_INVALID_ARG,
+ _("Only xlmigr://"
+ " migrations are supported by Xen"));
+ xmlFreeURI(uriptr);
+ return -1;
+ }
+ if (!uriptr->server) {
+ libxlError(VIR_ERR_INVALID_ARG,
+ _("A hostname must be"
+ " specified in the URI"));
+ xmlFreeURI(uriptr);
+ return -1;
+ }
+ hostname = strdup(uriptr->server);
+ if (!hostname) {
+ virReportOOMError();
+ xmlFreeURI(uriptr);
+ return -1;
+ }
+ if (uriptr->port)
+ snprintf(port, sizeof(port), "%d", uriptr->port);
+ xmlFreeURI(uriptr);
+ }
+ else if ((p = strrchr(uri, ':')) != NULL) { /* "hostname:port" */
+ int port_nr, n;
+
+ if (virStrToLong_i(p+1, NULL, 10, &port_nr) < 0) {
+ libxlError(VIR_ERR_INVALID_ARG,
+ _("Invalid port number"));
+ return -1;
+ }
+ snprintf(port, sizeof(port), "%d", port_nr);
+
+ /* Get the hostname. */
+ n = p - uri; /* n = Length of hostname in bytes. */
+ hostname = strdup(uri);
+ if (!hostname) {
+ virReportOOMError();
+ return -1;
+ }
+ hostname[n] = '\0';
+ }
+ else {/* "hostname" (or IP address) */
+ hostname = strdup(uri);
+ if (!hostname) {
+ virReportOOMError();
+ return -1;
+ }
+ }
+ *p_hostname = hostname;
+ *p_port = atoi(port);
+ return 0;
+}
+
+static bool libxlMigrationFromIsAllowed(libxlDriverPrivatePtr driver, virDomainObjPtr vm)
+{
+ /* to be extended */
+ VIR_DEBUG("driver=%p, vm=%p", driver, vm);
+ return true;
+}
+
+static bool libxlMigrationToIsAllowed(libxlDriverPrivatePtr driver, virDomainDefPtr def)
+{
+ /* to be extended */
+ VIR_DEBUG("driver=%p, def=%p", driver, def);
+ return true;
+}
+
+static char *
+libxlDomainMigrateBegin3(virDomainPtr domain,
+ const char *xmlin,
+ char **cookieout ATTRIBUTE_UNUSED,
+ int *cookieoutlen ATTRIBUTE_UNUSED,
+ unsigned long flags,
+ const char *dname ATTRIBUTE_UNUSED,
+ unsigned long resource ATTRIBUTE_UNUSED)
+{
+ libxlDriverPrivatePtr driver = domain->conn->privateData;
+ virDomainObjPtr vm;
+ virDomainDefPtr def = NULL;
+ char *xml = NULL;
+
+ virCheckFlags(LIBXL_MIGRATION_FLAGS, NULL);
+
+ libxlDriverLock(driver);
+ vm = virDomainFindByUUID(&driver->domains, domain->uuid);
+ if (!vm) {
+ char uuidstr[VIR_UUID_STRING_BUFLEN];
+ virUUIDFormat(domain->uuid, uuidstr);
+ libxlError(VIR_ERR_OPERATION_INVALID,
+ _("no domain with matching uuid '%s'"), uuidstr);
+ goto cleanup;
+ }
+
+ if (!virDomainObjIsActive(vm)) {
+ libxlError(VIR_ERR_OPERATION_INVALID,
+ _("domain is not running"));
+ goto cleanup;
+ }
+
+ if (!libxlMigrationFromIsAllowed(driver, vm)) {
+ libxlError(VIR_ERR_OPERATION_INVALID,
+ _("domain cannot do migration"));
+ goto cleanup;
+ }
+
+ if (xmlin) {
+ if (!(def = virDomainDefParseString(driver->caps, xml,
+ 1 << VIR_DOMAIN_VIRT_XEN,
+ VIR_DOMAIN_XML_INACTIVE)))
+ goto cleanup;
+
+ xml = virDomainDefFormat(def, VIR_DOMAIN_XML_SECURE);
+ } else {
+ xml = virDomainDefFormat(vm->def, VIR_DOMAIN_XML_SECURE);
+ }
+
+cleanup:
+ if (vm)
+ virDomainObjUnlock(vm);
+ libxlDriverUnlock(driver);
+ return xml;
+}
+
+static void doMigrateReceive(void *opaque)
+{
+ migrate_receive_args *data = opaque;
+ virConnectPtr conn = data->conn;
+ int sockfd = data->sockfd;
+ virDomainObjPtr vm = data->vm;
+ libxlDriverPrivatePtr driver = conn->privateData;
+ int recv_fd;
+ struct sockaddr_in new_addr;
+ socklen_t socklen = sizeof(new_addr);
+ int len;
+
+ do {
+ recv_fd = accept(sockfd, (struct sockaddr *)&new_addr, &socklen);
+ } while(recv_fd < 0 && errno == EINTR);
+
+ VIR_DEBUG("Accepted migration\n");
+ if (recv_fd < 0) {
+ VIR_DEBUG("Could not accept migration connection\n");
+ goto cleanup;
+ }
+
+ len = sizeof(migrate_receiver_banner);
+ if (safewrite(recv_fd, migrate_receiver_banner, len) != len) {
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("Failed to write migrate_receiver_banner"));
+ goto cleanup;
+ }
+
+ if (libxlVmStart(driver, vm, false, recv_fd) < 0) {
+ libxlError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to restore domain with libxenlight"));
+ if (!vm->persistent) {
+ virDomainRemoveInactive(&driver->domains, vm);
+ vm = NULL;
+ }
+ goto cleanup;
+ }
+
+ len = sizeof(migrate_receiver_ready);
+ if (safewrite(recv_fd, migrate_receiver_ready, len) != len) {
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("Failed to write migrate_receiver_ready"));
+ }
+
+cleanup:
+ if (VIR_CLOSE(recv_fd) < 0)
+ virReportSystemError(errno, "%s", _("cannot close recv_fd"));
+ if (VIR_CLOSE(sockfd) < 0)
+ virReportSystemError(errno, "%s", _("cannot close sockfd"));
+ if (vm)
+ virDomainObjUnlock(vm);
+ VIR_FREE(opaque);
+ return;
+}
+
+static int doMigrateSend(virDomainPtr dom, unsigned long flags, int sockfd)
+{
+ libxlDriverPrivatePtr driver = dom->conn->privateData;
+ virDomainObjPtr vm;
+ libxlDomainObjPrivatePtr priv;
+ libxl_domain_suspend_info suspinfo;
+ virDomainEventPtr event = NULL;
+ int live = 0;
+ int ret = -1;
+
+ if (flags & VIR_MIGRATE_LIVE)
+ live = 1;
+
+ vm = virDomainFindByUUID(&driver->domains, dom->uuid);
+ if (!vm) {
+ char uuidstr[VIR_UUID_STRING_BUFLEN];
+ virUUIDFormat(dom->uuid, uuidstr);
+ libxlError(VIR_ERR_OPERATION_INVALID,
+ _("no domain with matching uuid '%s'"), uuidstr);
+ goto cleanup;
+ }
+
+ priv = vm->privateData;
+
+ /* read fixed message from dest (ready to receive) */
+ if (libxlReadFixedMessage(sockfd, migrate_receiver_banner,
+ sizeof(migrate_receiver_banner))) {
+ goto cleanup;
+ }
+
+ /* send suspend data */
+ memset(&suspinfo, 0, sizeof(suspinfo));
+ if (live == 1)
+ suspinfo.flags |= XL_SUSPEND_LIVE;
+ if (libxl_domain_suspend(&priv->ctx, &suspinfo, vm->def->id, sockfd) != 0) {
+ libxlError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to save domain '%d' with libxenlight"),
+ vm->def->id);
+ goto cleanup;
+ }
+
+ /* read fixed message from dest (receive completed) */
+ if (libxlReadFixedMessage(sockfd, migrate_receiver_ready,
+ sizeof(migrate_receiver_ready))) {
+ /* Src side should be resumed, but for ret < 0, virsh won't call Src side
+ * Confirm3, handle it here.
+ */
+ libxl_domain_resume(&priv->ctx, vm->def->id);
+ goto cleanup;
+ }
+
+ ret = 0;
+
+cleanup:
+ if (vm)
+ virDomainObjUnlock(vm);
+ if (event)
+ libxlDomainEventQueue(driver, event);
+ return ret;
+}
+
+static int
+libxlDomainMigratePrepare3(virConnectPtr dconn,
+ const char *cookiein ATTRIBUTE_UNUSED,
+ int cookieinlen ATTRIBUTE_UNUSED,
+ char **cookieout ATTRIBUTE_UNUSED,
+ int *cookieoutlen ATTRIBUTE_UNUSED,
+ const char *uri_in,
+ char **uri_out,
+ unsigned long flags,
+ const char *dname,
+ unsigned long resource ATTRIBUTE_UNUSED,
+ const char *dom_xml)
+{
+ libxlDriverPrivatePtr driver = dconn->privateData;
+ virDomainDefPtr def = NULL;
+ virDomainObjPtr vm = NULL;
+ int port = 0;
+ int sockfd = -1;
+ struct sockaddr_in addr;
+ migrate_receive_args *args;
+ int ret = -1;
+
+ virCheckFlags(LIBXL_MIGRATION_FLAGS, -1);
+
+ libxlDriverLock(driver);
+ if (!dom_xml) {
+ libxlError(VIR_ERR_OPERATION_INVALID,
+ _("no domain XML passed"));
+ goto cleanup;
+ }
+
+ def = virDomainDefParseString(driver->caps, dom_xml,
+ 1 << VIR_DOMAIN_VIRT_XEN,
+ VIR_DOMAIN_XML_INACTIVE);
+
+ if (!libxlMigrationToIsAllowed(driver, def)) {
+ libxlError(VIR_ERR_OPERATION_INVALID,
+ _("cannot migrate domain to this host"));
+ goto cleanup;
+ }
+
+ /* Target domain name, maybe renamed. */
+ if (dname) {
+ def->name = strdup(dname);
+ if (def->name == NULL)
+ goto cleanup;
+ }
+
+ if (virDomainObjIsDuplicate(&driver->domains, def, 1) < 0)
+ goto cleanup;
+
+ if (!(vm = virDomainAssignDef(driver->caps, &driver->domains, def, true)))
+ goto cleanup;
+
+ def = NULL;
+
+ /* Create socket connection to receive migration data */
+ if (!uri_in) {
+ *uri_out = virGetHostname(dconn);
+ if (*uri_out == NULL)
+ goto cleanup;
+ } else {
+ char *hostname = NULL;
+ doParseURI(uri_in, &hostname, &port);
+ VIR_FREE (hostname);
+ }
+
+ if (port <= 0)
+ port = DEFAULT_MIGRATION_PORT;
+
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+ if (sockfd == -1) {
+ libxlError(VIR_ERR_OPERATION_INVALID,
+ _("Failed to create socket"));
+ goto cleanup;
+ }
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+ if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("Bind error"));
+ goto cleanup;
+ }
+
+ if (listen(sockfd, MAXCONN_NUM) < 0){
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("Listen error"));
+ goto cleanup;
+ }
+
+ if (VIR_ALLOC(args) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ args->conn = dconn;
+ args->vm = vm;
+ args->sockfd = sockfd;
+ if (virThreadCreate(&migrate_receive_thread,
+ true,
+ doMigrateReceive, args) < 0 ) {
+ virReportSystemError(errno, "%s",
+ _("Unable to create migration thread"));
+ VIR_FREE(args);
+ goto cleanup;
+ }
+
+ ret = 0;
+ goto end;
+
+cleanup:
+ if (VIR_CLOSE(sockfd) < 0)
+ virReportSystemError(errno, "%s", _("cannot close sockfd"));
+ if (vm)
+ virDomainObjUnlock(vm);
+
+end:
+ libxlDriverUnlock(driver);
+ return ret;
+}
+
+static int
+libxlDomainMigratePerform3(virDomainPtr dom,
+ const char *xmlin ATTRIBUTE_UNUSED,
+ const char *cookiein ATTRIBUTE_UNUSED,
+ int cookieinlen ATTRIBUTE_UNUSED,
+ char **cookieout ATTRIBUTE_UNUSED,
+ int *cookieoutlen ATTRIBUTE_UNUSED,
+ const char *dconnuri ATTRIBUTE_UNUSED,
+ const char *uri,
+ unsigned long flags,
+ const char *dname ATTRIBUTE_UNUSED,
+ unsigned long resource ATTRIBUTE_UNUSED)
+{
+ libxlDriverPrivatePtr driver = dom->conn->privateData;
+ char *hostname = NULL;
+ int port;
+ char *servname = NULL;
+ struct addrinfo hints, *res;
+ int sockfd = -1;
+ int ret = -1;
+
+ virCheckFlags(LIBXL_MIGRATION_FLAGS, -1);
+
+ libxlDriverLock(driver);
+
+ if (doParseURI(uri, &hostname, &port))
+ goto cleanup;
+
+ VIR_DEBUG("hostname = %s, port = %d", hostname, port);
+
+ if (virAsprintf(&servname, "%d", port ? port : DEFAULT_MIGRATION_PORT) < 0) {
+ virReportOOMError();
+ goto cleanup;
+ }
+
+ if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ){
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("Failed to create socket"));
+ goto cleanup;
+ }
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_INET;
+ hints.ai_socktype = SOCK_STREAM;
+ if (getaddrinfo(hostname, servname, &hints, &res) || res == NULL) {
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("IP address lookup failed"));
+ goto cleanup;
+ }
+
+ if (connect(sockfd, res->ai_addr, res->ai_addrlen) < 0) {
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("Connect error"));
+ goto cleanup;
+ }
+
+ ret = doMigrateSend(dom, flags, sockfd);
+
+cleanup:
+ if (VIR_CLOSE(sockfd) < 0)
+ virReportSystemError(errno, "%s", _("cannot close sockfd"));
+ VIR_FREE (hostname);
+ VIR_FREE(servname);
+ freeaddrinfo(res);
+ libxlDriverUnlock(driver);
+ return ret;
+}
+
+static virDomainPtr
+libxlDomainMigrateFinish3(virConnectPtr dconn,
+ const char *dname,
+ const char *cookiein ATTRIBUTE_UNUSED,
+ int cookieinlen ATTRIBUTE_UNUSED,
+ char **cookieout ATTRIBUTE_UNUSED,
+ int *cookieoutlen ATTRIBUTE_UNUSED,
+ const char *dconnuri ATTRIBUTE_UNUSED,
+ const char *uri ATTRIBUTE_UNUSED,
+ unsigned long flags,
+ int cancelled)
+{
+ libxlDriverPrivatePtr driver = dconn->privateData;
+ virDomainObjPtr vm = NULL;
+ virDomainPtr dom = NULL;
+ libxlDomainObjPrivatePtr priv;
+ virDomainEventPtr event = NULL;
+ int rc;
+
+ virCheckFlags(LIBXL_MIGRATION_FLAGS, NULL);
+ virThreadJoin(&migrate_receive_thread);
+
+ libxlDriverLock(driver);
+ vm = virDomainFindByName(&driver->domains, dname);
+ if (!vm)
+ goto cleanup;
+
+ if (!cancelled) {
+ if (!(flags & VIR_MIGRATE_PAUSED)) {
+ priv = vm->privateData;
+ rc = libxl_domain_unpause(&priv->ctx, vm->def->id);
+ if (rc) {
+ libxlError(VIR_ERR_OPERATION_FAILED,
+ _("Failed to unpause domain"));
+ goto error;
+ }
+
+ virDomainObjSetState(vm, VIR_DOMAIN_RUNNING, VIR_DOMAIN_RUNNING_BOOTED);
+ if (virDomainSaveStatus(driver->caps, driver->stateDir, vm) < 0)
+ goto error;
+ }
+
+ dom = virGetDomain (dconn, vm->def->name, vm->def->uuid);
+ goto cleanup;
+ }
+
+error:
+ if (libxlVmReap(driver, vm, 1, VIR_DOMAIN_SHUTOFF_SAVED)) {
+ libxlError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to destroy domain '%d'"), vm->def->id);
+ goto cleanup;
+ }
+ event = virDomainEventNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
+ VIR_DOMAIN_EVENT_STOPPED_SAVED);
+ if (!vm->persistent) {
+ virDomainRemoveInactive(&driver->domains, vm);
+ vm = NULL;
+ }
+
+cleanup:
+ if (vm)
+ virDomainObjUnlock(vm);
+ if (event)
+ libxlDomainEventQueue(driver, event);
+ libxlDriverUnlock(driver);
+ return dom;
+}
+
+static int
+libxlDomainMigrateConfirm3(virDomainPtr domain,
+ const char *cookiein ATTRIBUTE_UNUSED,
+ int cookieinlen ATTRIBUTE_UNUSED,
+ unsigned long flags,
+ int cancelled)
+{
+ libxlDriverPrivatePtr driver = domain->conn->privateData;
+ virDomainObjPtr vm;
+ libxlDomainObjPrivatePtr priv;
+ virDomainEventPtr event = NULL;
+ int ret = -1;
+
+ virCheckFlags(LIBXL_MIGRATION_FLAGS, -1);
+
+ libxlDriverLock(driver);
+ vm = virDomainFindByUUID(&driver->domains, domain->uuid);
+ if (!vm) {
+ char uuidstr[VIR_UUID_STRING_BUFLEN];
+ virUUIDFormat(domain->uuid, uuidstr);
+ libxlError(VIR_ERR_NO_DOMAIN,
+ _("no domain with matching uuid '%s'"), uuidstr);
+ goto cleanup;
+ }
+
+ if (cancelled) {
+ priv = vm->privateData;
+ libxlError(VIR_ERR_INTERNAL_ERROR,
+ _("migration failed, try to resume on our end"));
+ if (!libxl_domain_resume(&priv->ctx, vm->def->id))
+ ret = 0;
+
+ goto cleanup;
+ }
+
+ if (libxlVmReap(driver, vm, 1, VIR_DOMAIN_SHUTOFF_SAVED)) {
+ libxlError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to destroy domain '%d'"), vm->def->id);
+ goto cleanup;
+ }
+
+ event = virDomainEventNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
+ VIR_DOMAIN_EVENT_STOPPED_SAVED);
+
+ if (flags & VIR_MIGRATE_UNDEFINE_SOURCE)
+ virDomainDeleteConfig(driver->configDir, driver->autostartDir, vm);
+
+ if (!vm->persistent || (flags & VIR_MIGRATE_UNDEFINE_SOURCE)) {
+ virDomainRemoveInactive(&driver->domains, vm);
+ vm = NULL;
+ }
+
+ VIR_DEBUG("Migration successful.\n");
+ ret = 0;
+
+cleanup:
+ if (vm)
+ virDomainObjUnlock(vm);
+ libxlDriverUnlock(driver);
+ return ret;
+}
static virDriver libxlDriver = {
.no = VIR_DRV_LIBXL,
.name = "xenlight",
.open = libxlOpen, /* 0.9.0 */
.close = libxlClose, /* 0.9.0 */
+ .supports_feature = libxlSupportsFeature, /* 0.9.9 */
.type = libxlGetType, /* 0.9.0 */
.version = libxlGetVersion, /* 0.9.0 */
.getHostname = virGetHostname, /* 0.9.0 */
@@ -3906,6 +4518,11 @@ static virDriver libxlDriver = {
.domainGetSchedulerParametersFlags = libxlDomainGetSchedulerParametersFlags, /* 0.9.2 */
.domainSetSchedulerParameters = libxlDomainSetSchedulerParameters, /* 0.9.0 */
.domainSetSchedulerParametersFlags = libxlDomainSetSchedulerParametersFlags, /* 0.9.2 */
+ .domainMigrateBegin3 = libxlDomainMigrateBegin3, /* 0.9.9 */
+ .domainMigratePrepare3 = libxlDomainMigratePrepare3, /* 0.9.0 */
+ .domainMigratePerform3 = libxlDomainMigratePerform3, /* 0.9.9 */
+ .domainMigrateFinish3 = libxlDomainMigrateFinish3, /* 0.9.9 */
+ .domainMigrateConfirm3 = libxlDomainMigrateConfirm3, /* 0.9.9 */
.nodeGetFreeMemory = libxlNodeGetFreeMemory, /* 0.9.0 */
.domainEventRegister = libxlDomainEventRegister, /* 0.9.0 */
.domainEventDeregister = libxlDomainEventDeregister, /* 0.9.0 */
diff --git a/src/libxl/libxl_driver.h b/src/libxl/libxl_driver.h
index 4632d33..8a5fa6b 100644
--- a/src/libxl/libxl_driver.h
+++ b/src/libxl/libxl_driver.h
@@ -21,9 +21,22 @@
/*---------------------------------------------------------------------------*/
#ifndef LIBXL_DRIVER_H
-# define LIBXL_DRIVER_H
+#define LIBXL_DRIVER_H
-# include <config.h>
+#include <config.h>
+
+#define LIBXL_MIGRATION_FLAGS \
+ (VIR_MIGRATE_LIVE | \
+ VIR_MIGRATE_UNDEFINE_SOURCE | \
+ VIR_MIGRATE_PAUSED)
+
+#define DEFAULT_MIGRATION_PORT 8002
+#define MAXCONN_NUM 10
+
+static const char migrate_receiver_banner[]=
+ "xl migration receiver ready, send binary domain data";
+static const char migrate_receiver_ready[]=
+ "domain received, ready to unpause";
int libxlRegister(void);
--
1.7.3.4
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