diff options
Diffstat (limited to 'migration.c')
-rw-r--r-- | migration.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/migration.c b/migration.c index 9e6c43731e..0ef777adde 100644 --- a/migration.c +++ b/migration.c @@ -14,6 +14,20 @@ #include "qemu-common.h" #include "migration.h" #include "console.h" +#include "buffered_file.h" +#include "sysemu.h" +#include "block.h" +#include "qemu_socket.h" + +//#define DEBUG_MIGRATION + +#ifdef DEBUG_MIGRATION +#define dprintf(fmt, ...) \ + do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) +#else +#define dprintf(fmt, ...) \ + do { } while (0) +#endif /* Migration speed throttling */ static uint32_t max_throttle = (32 << 20); @@ -26,6 +40,10 @@ void qemu_start_incoming_migration(const char *uri) if (strstart(uri, "tcp:", &p)) tcp_start_incoming_migration(p); +#if !defined(WIN32) + else if (strstart(uri, "exec:", &p)) + exec_start_incoming_migration(p); +#endif else fprintf(stderr, "unknown migration protocol: %s\n", uri); } @@ -37,6 +55,10 @@ void do_migrate(int detach, const char *uri) if (strstart(uri, "tcp:", &p)) s = tcp_start_outgoing_migration(p, max_throttle, detach); +#if !defined(WIN32) + else if (strstart(uri, "exec:", &p)) + s = exec_start_outgoing_migration(p, max_throttle, detach); +#endif else term_printf("unknown migration protocol: %s\n", uri); @@ -101,3 +123,159 @@ void do_info_migrate(void) } } +/* shared migration helpers */ + +void migrate_fd_error(FdMigrationState *s) +{ + dprintf("setting error state\n"); + s->state = MIG_STATE_ERROR; + migrate_fd_cleanup(s); +} + +void migrate_fd_cleanup(FdMigrationState *s) +{ + qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); + + if (s->file) { + dprintf("closing file\n"); + qemu_fclose(s->file); + } + + if (s->fd != -1) + close(s->fd); + + /* Don't resume monitor until we've flushed all of the buffers */ + if (s->detach == 2) { + monitor_resume(); + s->detach = 0; + } + + s->fd = -1; +} + +void migrate_fd_put_notify(void *opaque) +{ + FdMigrationState *s = opaque; + + qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); + qemu_file_put_notify(s->file); +} + +ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size) +{ + FdMigrationState *s = opaque; + ssize_t ret; + + do { + ret = s->write(s, data, size); + } while (ret == -1 && ((s->get_error(s)) == EINTR || (s->get_error(s)) == EWOULDBLOCK)); + + if (ret == -1) + ret = -(s->get_error(s)); + + if (ret == -EAGAIN) + qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s); + + return ret; +} + +void migrate_fd_connect(FdMigrationState *s) +{ + int ret; + + s->file = qemu_fopen_ops_buffered(s, + s->bandwidth_limit, + migrate_fd_put_buffer, + migrate_fd_put_ready, + migrate_fd_wait_for_unfreeze, + migrate_fd_close); + + dprintf("beginning savevm\n"); + ret = qemu_savevm_state_begin(s->file); + if (ret < 0) { + dprintf("failed, %d\n", ret); + migrate_fd_error(s); + return; + } + + migrate_fd_put_ready(s); +} + +void migrate_fd_put_ready(void *opaque) +{ + FdMigrationState *s = opaque; + + if (s->state != MIG_STATE_ACTIVE) { + dprintf("put_ready returning because of non-active state\n"); + return; + } + + dprintf("iterate\n"); + if (qemu_savevm_state_iterate(s->file) == 1) { + dprintf("done iterating\n"); + vm_stop(0); + + bdrv_flush_all(); + qemu_savevm_state_complete(s->file); + s->state = MIG_STATE_COMPLETED; + migrate_fd_cleanup(s); + } +} + +int migrate_fd_get_status(MigrationState *mig_state) +{ + FdMigrationState *s = migrate_to_fms(mig_state); + return s->state; +} + +void migrate_fd_cancel(MigrationState *mig_state) +{ + FdMigrationState *s = migrate_to_fms(mig_state); + + if (s->state != MIG_STATE_ACTIVE) + return; + + dprintf("cancelling migration\n"); + + s->state = MIG_STATE_CANCELLED; + + migrate_fd_cleanup(s); +} + +void migrate_fd_release(MigrationState *mig_state) +{ + FdMigrationState *s = migrate_to_fms(mig_state); + + dprintf("releasing state\n"); + + if (s->state == MIG_STATE_ACTIVE) { + s->state = MIG_STATE_CANCELLED; + migrate_fd_cleanup(s); + } + free(s); +} + +void migrate_fd_wait_for_unfreeze(void *opaque) +{ + FdMigrationState *s = opaque; + int ret; + + dprintf("wait for unfreeze\n"); + if (s->state != MIG_STATE_ACTIVE) + return; + + do { + fd_set wfds; + + FD_ZERO(&wfds); + FD_SET(s->fd, &wfds); + + ret = select(s->fd + 1, NULL, &wfds, NULL, NULL); + } while (ret == -1 && (s->get_error(s)) == EINTR); +} + +int migrate_fd_close(void *opaque) +{ + FdMigrationState *s = opaque; + return s->close(s); +} |