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authorPaolo Bonzini <pbonzini@redhat.com>2009-08-18 15:56:25 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2009-08-27 19:33:15 -0500
commit5ac1fad324d869ab6971256aa56188ebac784e46 (patch)
treed1bcd758198eb80441a7cedaa5602fffa4d229a5 /migration-fd.c
parentdfffc65398e102bb01535d15b0e017fc73cbcf80 (diff)
add file descriptor migration
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Cc: Chris Lalancette <clalance@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'migration-fd.c')
-rw-r--r--migration-fd.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/migration-fd.c b/migration-fd.c
new file mode 100644
index 000000000..15b44158f
--- /dev/null
+++ b/migration-fd.c
@@ -0,0 +1,137 @@
+/*
+ * QEMU live migration via generic fd
+ *
+ * Copyright Red Hat, Inc. 2009
+ *
+ * Authors:
+ * Chris Lalancette <clalance@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "qemu_socket.h"
+#include "migration.h"
+#include "monitor.h"
+#include "qemu-char.h"
+#include "sysemu.h"
+#include "buffered_file.h"
+#include "block.h"
+#include "qemu_socket.h"
+
+//#define DEBUG_MIGRATION_FD
+
+#ifdef DEBUG_MIGRATION_FD
+#define dprintf(fmt, ...) \
+ do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define dprintf(fmt, ...) \
+ do { } while (0)
+#endif
+
+static int fd_errno(FdMigrationState *s)
+{
+ return errno;
+}
+
+static int fd_write(FdMigrationState *s, const void * buf, size_t size)
+{
+ return write(s->fd, buf, size);
+}
+
+static int fd_close(FdMigrationState *s)
+{
+ dprintf("fd_close\n");
+ if (s->fd != -1) {
+ close(s->fd);
+ s->fd = -1;
+ }
+ return 0;
+}
+
+MigrationState *fd_start_outgoing_migration(Monitor *mon,
+ const char *fdname,
+ int64_t bandwidth_limit,
+ int detach)
+{
+ FdMigrationState *s;
+
+ s = qemu_mallocz(sizeof(*s));
+
+ s->fd = monitor_get_fd(mon, fdname);
+ if (s->fd == -1) {
+ dprintf("fd_migration: invalid file descriptor identifier\n");
+ goto err_after_alloc;
+ }
+
+ if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) {
+ dprintf("Unable to set nonblocking mode on file descriptor\n");
+ goto err_after_open;
+ }
+
+ s->get_error = fd_errno;
+ s->write = fd_write;
+ s->close = fd_close;
+ s->mig_state.cancel = migrate_fd_cancel;
+ s->mig_state.get_status = migrate_fd_get_status;
+ s->mig_state.release = migrate_fd_release;
+
+ s->state = MIG_STATE_ACTIVE;
+ s->mon_resume = NULL;
+ s->bandwidth_limit = bandwidth_limit;
+
+ if (!detach)
+ migrate_fd_monitor_suspend(s);
+
+ migrate_fd_connect(s);
+ return &s->mig_state;
+
+err_after_open:
+ close(s->fd);
+err_after_alloc:
+ qemu_free(s);
+ return NULL;
+}
+
+static void fd_accept_incoming_migration(void *opaque)
+{
+ QEMUFile *f = opaque;
+ int ret;
+
+ ret = qemu_loadvm_state(f);
+ if (ret < 0) {
+ fprintf(stderr, "load of migration failed\n");
+ goto err;
+ }
+ qemu_announce_self();
+ dprintf("successfully loaded vm state\n");
+ /* we've successfully migrated, close the fd */
+ qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
+ if (autostart)
+ vm_start();
+
+err:
+ qemu_fclose(f);
+}
+
+int fd_start_incoming_migration(const char *infd)
+{
+ int fd;
+ QEMUFile *f;
+
+ dprintf("Attempting to start an incoming migration via fd\n");
+
+ fd = strtol(infd, NULL, 0);
+ f = qemu_fdopen(fd, "rb");
+ if(f == NULL) {
+ dprintf("Unable to apply qemu wrapper to file descriptor\n");
+ return -errno;
+ }
+
+ qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL,
+ (void *)(unsigned long)f);
+
+ return 0;
+}