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qemu: Use fd: protocol for migration

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By opening a connection to remote qemu process ourselves and passing the
socket to qemu we get much better errors than just "migration failed"
when the connection is opened by qemu.
This commit is contained in:
Jiri Denemark 2011-08-11 15:47:02 +02:00
parent e8989ae4e2
commit 3261761794
1 changed files with 100 additions and 30 deletions
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110
src/qemu/qemu_migration.c
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@ -1269,6 +1269,7 @@ cleanup:
enum qemuMigrationDestinationType {
MIGRATION_DEST_HOST,
MIGRATION_DEST_UNIX,
MIGRATION_DEST_FD,
};
enum qemuMigrationForwardType {
@ -1287,9 +1288,14 @@ struct _qemuMigrationSpec {
} host;
struct {
const char *file;
char *file;
int sock;
} unix_socket;
struct {
int qemu;
int local;
} fd;
} dest;
enum qemuMigrationForwardType fwdType;
@ -1481,6 +1487,14 @@ qemuMigrationRun(struct qemud_driver *driver,
ret = qemuMonitorMigrateToCommand(priv->mon, migrate_flags, args);
}
break;
case MIGRATION_DEST_FD:
if (spec->fwdType != MIGRATION_FWD_DIRECT)
fd = spec->dest.fd.local;
ret = qemuMonitorMigrateToFd(priv->mon, migrate_flags,
spec->dest.fd.qemu);
VIR_FORCE_CLOSE(spec->dest.fd.qemu);
break;
}
qemuDomainObjExitMonitorWithDriver(driver, vm);
if (ret < 0)
@ -1577,9 +1591,11 @@ static int doNativeMigrate(struct qemud_driver *driver,
unsigned long flags,
unsigned long resource)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
xmlURIPtr uribits = NULL;
int ret;
int ret = -1;
qemuMigrationSpec spec;
char *tmp = NULL;
VIR_DEBUG("driver=%p, vm=%p, uri=%s, cookiein=%s, cookieinlen=%d, "
"cookieout=%p, cookieoutlen=%p, flags=%lx, resource=%lu",
@ -1588,13 +1604,12 @@ static int doNativeMigrate(struct qemud_driver *driver,
if (STRPREFIX(uri, "tcp:") && !STRPREFIX(uri, "tcp://")) {
/* HACK: source host generates bogus URIs, so fix them up */
char *tmpuri;
if (virAsprintf(&tmpuri, "tcp://%s", uri + strlen("tcp:")) < 0) {
if (virAsprintf(&tmp, "tcp://%s", uri + strlen("tcp:")) < 0) {
virReportOOMError();
return -1;
}
uribits = xmlParseURI(tmpuri);
VIR_FREE(tmpuri);
uribits = xmlParseURI(tmp);
VIR_FREE(tmp);
} else {
uribits = xmlParseURI(uri);
}
@ -1604,13 +1619,38 @@ static int doNativeMigrate(struct qemud_driver *driver,
return -1;
}
spec.fwdType = MIGRATION_FWD_DIRECT;
if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD)) {
virNetSocketPtr sock;
spec.destType = MIGRATION_DEST_FD;
spec.dest.fd.qemu = -1;
if (virAsprintf(&tmp, "%d", uribits->port) < 0) {
virReportOOMError();
goto cleanup;
}
if (virNetSocketNewConnectTCP(uribits->server, tmp, &sock) == 0) {
spec.dest.fd.qemu = virNetSocketDupFD(sock, true);
virNetSocketFree(sock);
}
if (spec.dest.fd.qemu == -1)
goto cleanup;
} else {
spec.destType = MIGRATION_DEST_HOST;
spec.dest.host.name = uribits->server;
spec.dest.host.port = uribits->port;
spec.fwdType = MIGRATION_FWD_DIRECT;
}
ret = qemuMigrationRun(driver, vm, cookiein, cookieinlen, cookieout,
cookieoutlen, flags, resource, &spec);
cleanup:
if (spec.destType == MIGRATION_DEST_FD)
VIR_FORCE_CLOSE(spec.dest.fd.qemu);
VIR_FREE(tmp);
xmlFreeURI(uribits);
return ret;
@ -1628,7 +1668,6 @@ static int doTunnelMigrate(struct qemud_driver *driver,
unsigned long resource)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
char *unixfile = NULL;
virNetSocketPtr sock = NULL;
int ret = -1;
qemuMigrationSpec spec;
@ -1638,36 +1677,67 @@ static int doTunnelMigrate(struct qemud_driver *driver,
driver, vm, st, NULLSTR(cookiein), cookieinlen,
cookieout, cookieoutlen, flags, resource);
if (!qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_UNIX) &&
if (!qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD) &&
!qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_UNIX) &&
!qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_EXEC)) {
qemuReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("Source qemu is too old to support tunnelled migration"));
goto cleanup;
qemuReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("Source qemu is too old to support tunnelled migration"));
return -1;
}
if (virAsprintf(&unixfile, "%s/qemu.tunnelmigrate.src.%s",
spec.fwdType = MIGRATION_FWD_STREAM;
spec.fwd.stream = st;
if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD)) {
int fds[2];
spec.destType = MIGRATION_DEST_FD;
spec.dest.fd.qemu = -1;
spec.dest.fd.local = -1;
if (pipe(fds) == 0) {
spec.dest.fd.qemu = fds[1];
spec.dest.fd.local = fds[0];
}
if (spec.dest.fd.qemu == -1 ||
virSetCloseExec(spec.dest.fd.qemu) < 0 ||
virSetCloseExec(spec.dest.fd.local) < 0) {
virReportSystemError(errno, "%s",
_("cannot create pipe for tunnelled migration"));
goto cleanup;
}
} else {
spec.destType = MIGRATION_DEST_UNIX;
spec.dest.unix_socket.sock = -1;
spec.dest.unix_socket.file = NULL;
if (virAsprintf(&spec.dest.unix_socket.file,
"%s/qemu.tunnelmigrate.src.%s",
driver->libDir, vm->def->name) < 0) {
virReportOOMError();
goto cleanup;
}
if (virNetSocketNewListenUNIX(unixfile, 0700,
driver->user, driver->group, &sock) < 0 ||
if (virNetSocketNewListenUNIX(spec.dest.unix_socket.file, 0700,
driver->user, driver->group,
&sock) < 0 ||
virNetSocketListen(sock, 1) < 0)
goto cleanup;
spec.destType = MIGRATION_DEST_UNIX;
spec.dest.unix_socket.file = unixfile;
spec.dest.unix_socket.sock = virNetSocketGetFD(sock);
spec.fwdType = MIGRATION_FWD_STREAM;
spec.fwd.stream = st;
}
ret = qemuMigrationRun(driver, vm, cookiein, cookieinlen, cookieout,
cookieoutlen, flags, resource, &spec);
cleanup:
if (spec.destType == MIGRATION_DEST_FD) {
VIR_FORCE_CLOSE(spec.dest.fd.qemu);
VIR_FORCE_CLOSE(spec.dest.fd.local);
} else {
virNetSocketFree(sock);
VIR_FREE(unixfile);
VIR_FREE(spec.dest.unix_socket.file);
}
return ret;
}