[libvirt] [RFC PATCH] libxl: add tunnelled migration support
Bob Liu
bob.liu at oracle.com
Wed Oct 26 06:33:03 UTC 2016
Tunnelled migration doesn't require any extra network connections beside the
libvirt daemon.
It's capable of strong encryption and is the default option in openstack-nova.
This patch add the tunnelled migration(Tunnel3params) support to libxl.
The data flow in the src side is:
* libxlDoMigrateSend() -> pipe
* libxlTunnel3MigrationFunc() poll pipe out and then write to dest stream.
While in the dest side:
Stream -> pipe -> 'recvfd of libxlDomainStartRestore'
The usage is the same as p2p migration, execpt adding one more '--tunnelled' to
the libvirt p2p migration command.
Signed-off-by: Bob Liu <bob.liu at oracle.com>
---
src/libxl/libxl_driver.c | 58 ++++++++++-
src/libxl/libxl_migration.c | 241 +++++++++++++++++++++++++++++++++++++++++---
src/libxl/libxl_migration.h | 9 ++
3 files changed, 292 insertions(+), 16 deletions(-)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index b66cb1f..a01bbff 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -5918,6 +5918,61 @@ libxlDomainMigrateBegin3Params(virDomainPtr domain,
}
static int
+libxlDomainMigratePrepareTunnel3Params(virConnectPtr dconn,
+ virStreamPtr st,
+ virTypedParameterPtr params,
+ int nparams,
+ const char *cookiein,
+ int cookieinlen,
+ char **cookieout ATTRIBUTE_UNUSED,
+ int *cookieoutlen ATTRIBUTE_UNUSED,
+ unsigned int flags)
+{
+ libxlDriverPrivatePtr driver = dconn->privateData;
+ virDomainDefPtr def = NULL;
+ const char *dom_xml = NULL;
+ const char *dname = NULL;
+ const char *uri_in = NULL;
+
+#ifdef LIBXL_HAVE_NO_SUSPEND_RESUME
+ virReportUnsupportedError();
+ return -1;
+#endif
+
+ 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 (virDomainMigratePrepareTunnel3ParamsEnsureACL(dconn, def) < 0)
+ goto error;
+
+ if (libxlDomainMigrationPrepareTunnel3(dconn, st, &def, cookiein,
+ cookieinlen, flags) < 0)
+ goto error;
+
+ return 0;
+
+ error:
+ virDomainDefFree(def);
+ return -1;
+}
+
+static int
libxlDomainMigratePrepare3Params(virConnectPtr dconn,
virTypedParameterPtr params,
int nparams,
@@ -6017,7 +6072,7 @@ libxlDomainMigratePerform3Params(virDomainPtr dom,
if (virDomainMigratePerform3ParamsEnsureACL(dom->conn, vm->def) < 0)
goto cleanup;
- if (flags & VIR_MIGRATE_PEER2PEER) {
+ if ((flags & (VIR_MIGRATE_TUNNELLED | VIR_MIGRATE_PEER2PEER))) {
if (libxlDomainMigrationPerformP2P(driver, vm, dom->conn, dom_xml,
dconnuri, uri, dname, flags) < 0)
goto cleanup;
@@ -6501,6 +6556,7 @@ static virHypervisorDriver libxlHypervisorDriver = {
.nodeDeviceReset = libxlNodeDeviceReset, /* 1.2.3 */
.domainMigrateBegin3Params = libxlDomainMigrateBegin3Params, /* 1.2.6 */
.domainMigratePrepare3Params = libxlDomainMigratePrepare3Params, /* 1.2.6 */
+ .domainMigratePrepareTunnel3Params = libxlDomainMigratePrepareTunnel3Params, /* 2.3.1 */
.domainMigratePerform3Params = libxlDomainMigratePerform3Params, /* 1.2.6 */
.domainMigrateFinish3Params = libxlDomainMigrateFinish3Params, /* 1.2.6 */
.domainMigrateConfirm3Params = libxlDomainMigrateConfirm3Params, /* 1.2.6 */
diff --git a/src/libxl/libxl_migration.c b/src/libxl/libxl_migration.c
index 534abb8..88c9bb8 100644
--- a/src/libxl/libxl_migration.c
+++ b/src/libxl/libxl_migration.c
@@ -44,6 +44,7 @@
#include "libxl_migration.h"
#include "locking/domain_lock.h"
#include "virtypedparam.h"
+#include "fdstream.h"
#define VIR_FROM_THIS VIR_FROM_LIBXL
@@ -484,6 +485,90 @@ libxlDomainMigrationPrepareDef(libxlDriverPrivatePtr driver,
}
int
+libxlDomainMigrationPrepareTunnel3(virConnectPtr dconn,
+ virStreamPtr st,
+ virDomainDefPtr *def,
+ const char *cookiein,
+ int cookieinlen,
+ unsigned int flags)
+{
+ libxlMigrationCookiePtr mig = NULL;
+ libxlDriverPrivatePtr driver = dconn->privateData;
+ virDomainObjPtr vm = NULL;
+ libxlMigrationDstArgs *args = NULL;
+ virThread thread;
+ int dataFD[2] = { -1, -1 };
+ int ret = 0;
+
+ if (libxlMigrationEatCookie(cookiein, cookieinlen, &mig) < 0)
+ goto error;
+
+ if (mig->xenMigStreamVer > LIBXL_SAVE_VERSION) {
+ virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
+ _("Xen migration stream version '%d' is not supported on this host"),
+ mig->xenMigStreamVer);
+ goto error;
+ }
+
+ if (!(vm = virDomainObjListAdd(driver->domains, *def,
+ driver->xmlopt,
+ VIR_DOMAIN_OBJ_LIST_ADD_LIVE |
+ VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE,
+ NULL)))
+ goto error;
+
+ /*
+ * The data flow of tunnel3 migration in the dest side:
+ * stream -> pipe -> recvfd of libxlDomainStartRestore
+ */
+ if (pipe(dataFD) < 0)
+ goto error;
+
+ /* Stream data will be written to pipeIn */
+ if (virFDStreamOpen(st, dataFD[1]) < 0)
+ goto error;
+
+ if (libxlMigrationDstArgsInitialize() < 0)
+ goto error;
+
+ if (!(args = virObjectNew(libxlMigrationDstArgsClass)))
+ goto error;
+
+ args->conn = dconn;
+ args->vm = vm;
+ args->flags = flags;
+ args->migcookie = mig;
+ /* Receive from pipeOut */
+ args->recvfd = dataFD[0];
+ args->nsocks = 0;
+ if (virThreadCreate(&thread, false, libxlDoMigrateReceive, args) < 0) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("Failed to create thread for receiving migration data"));
+ goto error;
+ }
+
+ goto done;
+
+ error:
+ VIR_FORCE_CLOSE(dataFD[1]);
+ VIR_FORCE_CLOSE(dataFD[0]);
+ virObjectUnref(args);
+ /* Remove virDomainObj from domain list */
+ if (vm) {
+ virDomainObjListRemove(driver->domains, vm);
+ vm = NULL;
+ }
+ ret = -1;
+
+ done:
+ /* Nobody will close dataFD[1]? */
+ if (vm)
+ virObjectUnlock(vm);
+
+ return ret;
+}
+
+int
libxlDomainMigrationPrepare(virConnectPtr dconn,
virDomainDefPtr *def,
const char *uri_in,
@@ -710,9 +795,90 @@ libxlDomainMigrationPrepare(virConnectPtr dconn,
return ret;
}
-/* This function is a simplification of virDomainMigrateVersion3Full
- * excluding tunnel support and restricting it to migration v3
- * with params since it was the first to be introduced in libxl.
+typedef struct _libxlTunnelMigrationThread libxlTunnelMigrationThread;
+struct _libxlTunnelMigrationThread {
+ virThread thread;
+ virStreamPtr st;
+ int srcFD;
+};
+#define TUNNEL_SEND_BUF_SIZE 65536
+
+/*
+ * The data flow of tunnel3 migration in the src side:
+ * libxlDoMigrateSend() -> pipe
+ * libxlTunnel3MigrationFunc() polls pipe out and then write to dest stream.
+ */
+static void libxlTunnel3MigrationFunc(void *arg)
+{
+ libxlTunnelMigrationThread *data = (libxlTunnelMigrationThread *)arg;
+ char *buffer = NULL;
+ struct pollfd fds[1];
+ int timeout = -1;
+
+ if (VIR_ALLOC_N(buffer, TUNNEL_SEND_BUF_SIZE) < 0) {
+ virReportError(errno, "%s", _("poll failed in migration tunnel"));
+ return;
+ }
+
+ fds[0].fd = data->srcFD;
+ for (;;) {
+ int ret;
+
+ fds[0].events = POLLIN;
+ fds[0].revents = 0;
+ ret = poll(fds, ARRAY_CARDINALITY(fds), timeout);
+ if (ret < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+ virReportError(errno, "%s",
+ _("poll failed in libxlTunnel3MigrationFunc"));
+ goto abrt;
+ }
+
+ if (ret == 0) {
+ VIR_DEBUG("poll got timeout");
+ break;
+ }
+
+ if (fds[0].revents & (POLLIN | POLLERR | POLLHUP)) {
+ int nbytes;
+
+ nbytes = read(data->srcFD, buffer, TUNNEL_SEND_BUF_SIZE);
+ if (nbytes > 0) {
+ /* Write to dest stream */
+ if (virStreamSend(data->st, buffer, nbytes) < 0) {
+ virReportError(errno, "%s",
+ _("tunnelled migration failed to send to virStream"));
+ goto abrt;
+ }
+ } else if (nbytes < 0) {
+ virReportError(errno, "%s",
+ _("tunnelled migration failed to read from xen side"));
+ goto abrt;
+ } else {
+ /* EOF; transferred all data */
+ break;
+ }
+ }
+ }
+
+ if (virStreamFinish(data->st) < 0)
+ virReportError(errno, "%s",
+ _("tunnelled migration failed to finish stream"));
+
+ cleanup:
+ VIR_FREE(buffer);
+
+ return;
+
+ abrt:
+ virStreamAbort(data->st);
+ goto cleanup;
+}
+
+/* This function is a simplification of virDomainMigrateVersion3Full and
+ * restricting it to migration v3 with params since it was the first to be
+ * introduced in libxl.
*/
static int
libxlDoMigrateP2P(libxlDriverPrivatePtr driver,
@@ -737,6 +903,10 @@ libxlDoMigrateP2P(libxlDriverPrivatePtr driver,
bool cancelled = true;
virErrorPtr orig_err = NULL;
int ret = -1;
+ /* For tunnel migration */
+ virStreamPtr st = NULL;
+ libxlTunnelMigrationThread *libxlTunnelMigationThreadPtr = NULL;
+ int dataFD[2] = { -1, -1 };
dom_xml = libxlDomainMigrationBegin(sconn, vm, xmlin,
&cookieout, &cookieoutlen);
@@ -764,29 +934,62 @@ libxlDoMigrateP2P(libxlDriverPrivatePtr driver,
VIR_DEBUG("Prepare3");
virObjectUnlock(vm);
- ret = dconn->driver->domainMigratePrepare3Params
- (dconn, params, nparams, cookieout, cookieoutlen, NULL, NULL, &uri_out, destflags);
+ if (flags & VIR_MIGRATE_TUNNELLED) {
+ if (!(st = virStreamNew(dconn, 0)))
+ goto cleanup;
+ ret = dconn->driver->domainMigratePrepareTunnel3Params
+ (dconn, st, params, nparams, cookieout, cookieoutlen, NULL, NULL, destflags);
+ } else {
+ ret = dconn->driver->domainMigratePrepare3Params
+ (dconn, params, nparams, cookieout, cookieoutlen, NULL, NULL, &uri_out, destflags);
+ }
virObjectLock(vm);
if (ret == -1)
goto cleanup;
- if (uri_out) {
- if (virTypedParamsReplaceString(¶ms, &nparams,
- VIR_MIGRATE_PARAM_URI, uri_out) < 0) {
- orig_err = virSaveLastError();
+ if (!(flags & VIR_MIGRATE_TUNNELLED)) {
+ if (uri_out) {
+ if (virTypedParamsReplaceString(¶ms, &nparams,
+ VIR_MIGRATE_PARAM_URI, uri_out) < 0) {
+ orig_err = virSaveLastError();
+ goto finish;
+ }
+ } else {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("domainMigratePrepare3 did not set uri"));
goto finish;
}
- } else {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("domainMigratePrepare3 did not set uri"));
- goto finish;
}
VIR_DEBUG("Perform3 uri=%s", NULLSTR(uri_out));
- ret = libxlDomainMigrationPerform(driver, vm, NULL, NULL,
- uri_out, NULL, flags);
+ if (flags & VIR_MIGRATE_TUNNELLED) {
+ if (VIR_ALLOC(libxlTunnelMigationThreadPtr) < 0)
+ goto cleanup;
+ if (pipe(dataFD) < 0) {
+ virReportError(errno, "%s", _("Unable to make pipes"));
+ goto cleanup;
+ }
+ /* Read from pipe */
+ libxlTunnelMigationThreadPtr->srcFD = dataFD[0];
+ /* Write to dest stream */
+ libxlTunnelMigationThreadPtr->st = st;
+ if (virThreadCreate(&libxlTunnelMigationThreadPtr->thread, true,
+ libxlTunnel3MigrationFunc,
+ libxlTunnelMigationThreadPtr) < 0) {
+ virReportError(errno, "%s",
+ _("Unable to create tunnel migration thread"));
+ goto cleanup;
+ }
+ virObjectUnlock(vm);
+ /* Send data to pipe */
+ ret = libxlDoMigrateSend(driver, vm, flags, dataFD[1]);
+ virObjectLock(vm);
+ } else {
+ ret = libxlDomainMigrationPerform(driver, vm, NULL, NULL,
+ uri_out, NULL, flags);
+ }
if (ret < 0)
orig_err = virSaveLastError();
@@ -824,6 +1027,14 @@ libxlDoMigrateP2P(libxlDriverPrivatePtr driver,
vm->def->name);
cleanup:
+ if (libxlTunnelMigationThreadPtr) {
+ virThreadCancel(&libxlTunnelMigationThreadPtr->thread);
+ VIR_FREE(libxlTunnelMigationThreadPtr);
+ }
+ VIR_FORCE_CLOSE(dataFD[0]);
+ VIR_FORCE_CLOSE(dataFD[1]);
+ virObjectUnref(st);
+
if (ddomain) {
virObjectUnref(ddomain);
ret = 0;
diff --git a/src/libxl/libxl_migration.h b/src/libxl/libxl_migration.h
index 8a074a0..fcea558 100644
--- a/src/libxl/libxl_migration.h
+++ b/src/libxl/libxl_migration.h
@@ -29,6 +29,7 @@
# define LIBXL_MIGRATION_FLAGS \
(VIR_MIGRATE_LIVE | \
VIR_MIGRATE_PEER2PEER | \
+ VIR_MIGRATE_TUNNELLED | \
VIR_MIGRATE_PERSIST_DEST | \
VIR_MIGRATE_UNDEFINE_SOURCE | \
VIR_MIGRATE_PAUSED)
@@ -53,6 +54,14 @@ libxlDomainMigrationPrepareDef(libxlDriverPrivatePtr driver,
const char *dname);
int
+libxlDomainMigrationPrepareTunnel3(virConnectPtr dconn,
+ virStreamPtr st,
+ virDomainDefPtr *def,
+ const char *cookiein,
+ int cookieinlen,
+ unsigned int flags);
+
+int
libxlDomainMigrationPrepare(virConnectPtr dconn,
virDomainDefPtr *def,
const char *uri_in,
--
2.6.5
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