From 5ac1fad324d869ab6971256aa56188ebac784e46 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 18 Aug 2009 15:56:25 +0200 Subject: add file descriptor migration Signed-off-by: Paolo Bonzini Cc: Chris Lalancette Signed-off-by: Anthony Liguori --- migration-fd.c | 137 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 migration-fd.c (limited to 'migration-fd.c') diff --git a/migration-fd.c b/migration-fd.c new file mode 100644 index 0000000000..15b44158ff --- /dev/null +++ b/migration-fd.c @@ -0,0 +1,137 @@ +/* + * QEMU live migration via generic fd + * + * Copyright Red Hat, Inc. 2009 + * + * Authors: + * Chris Lalancette + * + * 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; +} -- cgit v1.2.3