From 1f5a5623052ba8d593e4356f9fda0281e607be76 Mon Sep 17 00:00:00 2001 From: Wolfgang Bumiller Date: Wed, 9 Dec 2015 16:04:32 +0100 Subject: [PATCH 10/28] internal snapshot async --- Makefile.objs | 1 + block.c | 2 +- hmp-commands-info.hx | 13 ++ hmp-commands.hx | 32 +++ hmp.c | 57 ++++++ hmp.h | 5 + include/block/block.h | 1 + include/sysemu/sysemu.h | 5 +- migration/savevm.c | 12 +- qapi-schema.json | 68 +++++++ qemu-options.hx | 13 ++ savevm-async.c | 523 ++++++++++++++++++++++++++++++++++++++++++++++++ vl.c | 8 + 13 files changed, 732 insertions(+), 8 deletions(-) create mode 100644 savevm-async.c diff --git a/Makefile.objs b/Makefile.objs index 6167e7b17d..fbfbbb7f70 100644 --- a/Makefile.objs +++ b/Makefile.objs @@ -50,6 +50,7 @@ common-obj-$(CONFIG_LINUX) += fsdev/ common-obj-y += migration/ common-obj-y += page_cache.o #aio.o +common-obj-y += savevm-async.o common-obj-$(CONFIG_SPICE) += spice-qemu-char.o diff --git a/block.c b/block.c index 1fbbb8d606..6ea9ed1c62 100644 --- a/block.c +++ b/block.c @@ -3091,7 +3091,7 @@ out: bdrv_unref(bs_new); } -static void bdrv_delete(BlockDriverState *bs) +void bdrv_delete(BlockDriverState *bs) { assert(!bs->job); assert(bdrv_op_blocker_is_empty(bs)); diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx index a53f105c52..5fc57a2210 100644 --- a/hmp-commands-info.hx +++ b/hmp-commands-info.hx @@ -560,6 +560,19 @@ Show current migration xbzrle cache size. ETEXI { + .name = "savevm", + .args_type = "", + .params = "", + .help = "show savevm status", + .cmd = hmp_info_savevm, + }, + +STEXI +@item info savevm +show savevm status +ETEXI + + { .name = "balloon", .args_type = "", .params = "", diff --git a/hmp-commands.hx b/hmp-commands.hx index 88192817b2..58940a762b 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1777,3 +1777,35 @@ ETEXI STEXI @end table ETEXI + + { + .name = "savevm-start", + .args_type = "statefile:s?", + .params = "[statefile]", + .help = "Prepare for snapshot and halt VM. Save VM state to statefile.", + .cmd = hmp_savevm_start, + }, + + { + .name = "snapshot-drive", + .args_type = "device:s,name:s", + .params = "device name", + .help = "Create internal snapshot.", + .cmd = hmp_snapshot_drive, + }, + + { + .name = "delete-drive-snapshot", + .args_type = "device:s,name:s", + .params = "device name", + .help = "Delete internal snapshot.", + .cmd = hmp_delete_drive_snapshot, + }, + + { + .name = "savevm-end", + .args_type = "", + .params = "", + .help = "Resume VM after snaphot.", + .cmd = hmp_savevm_end, + }, diff --git a/hmp.c b/hmp.c index 904542d026..f725d061e6 100644 --- a/hmp.c +++ b/hmp.c @@ -2207,6 +2207,63 @@ void hmp_info_memory_devices(Monitor *mon, const QDict *qdict) qapi_free_MemoryDeviceInfoList(info_list); } +void hmp_savevm_start(Monitor *mon, const QDict *qdict) +{ + Error *errp = NULL; + const char *statefile = qdict_get_try_str(qdict, "statefile"); + + qmp_savevm_start(statefile != NULL, statefile, &errp); + hmp_handle_error(mon, &errp); +} + +void hmp_snapshot_drive(Monitor *mon, const QDict *qdict) +{ + Error *errp = NULL; + const char *name = qdict_get_str(qdict, "name"); + const char *device = qdict_get_str(qdict, "device"); + + qmp_snapshot_drive(device, name, &errp); + hmp_handle_error(mon, &errp); +} + +void hmp_delete_drive_snapshot(Monitor *mon, const QDict *qdict) +{ + Error *errp = NULL; + const char *name = qdict_get_str(qdict, "name"); + const char *device = qdict_get_str(qdict, "device"); + + qmp_delete_drive_snapshot(device, name, &errp); + hmp_handle_error(mon, &errp); +} + +void hmp_savevm_end(Monitor *mon, const QDict *qdict) +{ + Error *errp = NULL; + + qmp_savevm_end(&errp); + hmp_handle_error(mon, &errp); +} + +void hmp_info_savevm(Monitor *mon, const QDict *qdict) +{ + SaveVMInfo *info; + info = qmp_query_savevm(NULL); + + if (info->has_status) { + monitor_printf(mon, "savevm status: %s\n", info->status); + monitor_printf(mon, "total time: %" PRIu64 " milliseconds\n", + info->total_time); + } else { + monitor_printf(mon, "savevm status: not running\n"); + } + if (info->has_bytes) { + monitor_printf(mon, "Bytes saved: %"PRIu64"\n", info->bytes); + } + if (info->has_error) { + monitor_printf(mon, "Error: %s\n", info->error); + } +} + void hmp_info_iothreads(Monitor *mon, const QDict *qdict) { IOThreadInfoList *info_list = qmp_query_iothreads(NULL); diff --git a/hmp.h b/hmp.h index 799fd371fa..0497afbf65 100644 --- a/hmp.h +++ b/hmp.h @@ -26,6 +26,7 @@ void hmp_info_status(Monitor *mon, const QDict *qdict); void hmp_info_uuid(Monitor *mon, const QDict *qdict); void hmp_info_chardev(Monitor *mon, const QDict *qdict); void hmp_info_mice(Monitor *mon, const QDict *qdict); +void hmp_info_savevm(Monitor *mon, const QDict *qdict); void hmp_info_migrate(Monitor *mon, const QDict *qdict); void hmp_info_migrate_capabilities(Monitor *mon, const QDict *qdict); void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict); @@ -92,6 +93,10 @@ void hmp_netdev_add(Monitor *mon, const QDict *qdict); void hmp_netdev_del(Monitor *mon, const QDict *qdict); void hmp_getfd(Monitor *mon, const QDict *qdict); void hmp_closefd(Monitor *mon, const QDict *qdict); +void hmp_savevm_start(Monitor *mon, const QDict *qdict); +void hmp_snapshot_drive(Monitor *mon, const QDict *qdict); +void hmp_delete_drive_snapshot(Monitor *mon, const QDict *qdict); +void hmp_savevm_end(Monitor *mon, const QDict *qdict); void hmp_sendkey(Monitor *mon, const QDict *qdict); void hmp_screendump(Monitor *mon, const QDict *qdict); void hmp_nbd_server_start(Monitor *mon, const QDict *qdict); diff --git a/include/block/block.h b/include/block/block.h index 5ddc0cf21b..7eff87c7dd 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -295,6 +295,7 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, int bdrv_get_backing_file_depth(BlockDriverState *bs); void bdrv_refresh_filename(BlockDriverState *bs); int bdrv_truncate(BdrvChild *child, int64_t offset); +void bdrv_delete(BlockDriverState *bs); int64_t bdrv_nb_sectors(BlockDriverState *bs); int64_t bdrv_getlength(BlockDriverState *bs); int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h index 576c7ce640..74623de16c 100644 --- a/include/sysemu/sysemu.h +++ b/include/sysemu/sysemu.h @@ -78,6 +78,7 @@ void qemu_remove_machine_init_done_notifier(Notifier *notify); void hmp_savevm(Monitor *mon, const QDict *qdict); int save_vmstate(Monitor *mon, const char *name); int load_vmstate(const char *name); +int load_state_from_blockdev(const char *filename); void hmp_delvm(Monitor *mon, const QDict *qdict); void hmp_info_snapshots(Monitor *mon, const QDict *qdict); @@ -105,13 +106,13 @@ enum qemu_vm_cmd { #define MAX_VM_CMD_PACKAGED_SIZE (1ul << 24) bool qemu_savevm_state_blocked(Error **errp); -void qemu_savevm_state_begin(QEMUFile *f, +int qemu_savevm_state_begin(QEMUFile *f, const MigrationParams *params); void qemu_savevm_state_header(QEMUFile *f); int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy); void qemu_savevm_state_cleanup(void); void qemu_savevm_state_complete_postcopy(QEMUFile *f); -void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only); +int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only); void qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size, uint64_t *res_non_postcopiable, uint64_t *res_postcopiable); diff --git a/migration/savevm.c b/migration/savevm.c index 3b19a4a274..feb0dc6834 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -970,11 +970,11 @@ void qemu_savevm_state_header(QEMUFile *f) } -void qemu_savevm_state_begin(QEMUFile *f, +int qemu_savevm_state_begin(QEMUFile *f, const MigrationParams *params) { SaveStateEntry *se; - int ret; + int ret = 0; trace_savevm_state_begin(); QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { @@ -1002,6 +1002,7 @@ void qemu_savevm_state_begin(QEMUFile *f, break; } } + return ret; } /* @@ -1105,7 +1106,7 @@ void qemu_savevm_state_complete_postcopy(QEMUFile *f) qemu_fflush(f); } -void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) +int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) { QJSON *vmdesc; int vmdesc_len; @@ -1139,12 +1140,12 @@ void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) save_section_footer(f, se); if (ret < 0) { qemu_file_set_error(f, ret); - return; + return ret; } } if (iterable_only) { - return; + return ret; } vmdesc = qjson_new(); @@ -1191,6 +1192,7 @@ void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) qjson_destroy(vmdesc); qemu_fflush(f); + return qemu_file_get_error(f); } /* Give an estimate of the amount left to be transferred, diff --git a/qapi-schema.json b/qapi-schema.json index 1b14ff2476..361700d37c 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -723,6 +723,40 @@ '*error-desc': 'str'} } ## +# @SaveVMInfo: +# +# Information about current migration process. +# +# @status: string describing the current savevm status. +# This can be 'active', 'completed', 'failed'. +# If this field is not returned, no savevm process +# has been initiated +# +# @error: string containing error message is status is failed. +# +# @total-time: total amount of milliseconds since savevm started. +# If savevm has ended, it returns the total save time +# +# @bytes: total amount of data transfered +# +# Since: 1.3 +## +{ 'struct': 'SaveVMInfo', + 'data': {'*status': 'str', '*error': 'str', + '*total-time': 'int', '*bytes': 'int'} } + +## +# @query-savevm: +# +# Returns information about current savevm process. +# +# Returns: @SaveVMInfo +# +# Since: 1.3 +## +{ 'command': 'query-savevm', 'returns': 'SaveVMInfo' } + +## # @query-migrate: # # Returns information about current migration process. If migration @@ -4735,9 +4769,43 @@ # # Since: 1.2.0 ## + { 'command': 'query-target', 'returns': 'TargetInfo' } ## +# @savevm-start: +# +# Prepare for snapshot and halt VM. Save VM state to statefile. +# +## +{ 'command': 'savevm-start', 'data': { '*statefile': 'str' } } + +## +# @snapshot-drive: +# +# Create an internal drive snapshot. +# +## +{ 'command': 'snapshot-drive', 'data': { 'device': 'str', 'name': 'str' } } + +## +# @delete-drive-snapshot: +# +# Delete a drive snapshot. +# +## +{ 'command': 'delete-drive-snapshot', 'data': { 'device': 'str', 'name': 'str' } } + +## +# @savevm-end: +# +# Resume VM after a snapshot. +# +## +{ 'command': 'savevm-end' } + + +## # @QKeyCode: # # An enumeration of key name. diff --git a/qemu-options.hx b/qemu-options.hx index 99af8edf5f..10f0e81f9b 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3396,6 +3396,19 @@ STEXI Start right away with a saved state (@code{loadvm} in monitor) ETEXI +DEF("loadstate", HAS_ARG, QEMU_OPTION_loadstate, \ + "-loadstate file\n" \ + " start right away with a saved state\n", + QEMU_ARCH_ALL) +STEXI +@item -loadstate @var{file} +@findex -loadstate +Start right away with a saved state. This option does not rollback +disk state like @code{loadvm}, so user must make sure that disk +have correct state. @var{file} can be any valid device URL. See the section +for "Device URL Syntax" for more information. +ETEXI + #ifndef _WIN32 DEF("daemonize", 0, QEMU_OPTION_daemonize, \ "-daemonize daemonize QEMU after initializing\n", QEMU_ARCH_ALL) diff --git a/savevm-async.c b/savevm-async.c new file mode 100644 index 0000000000..2f4766cf6c --- /dev/null +++ b/savevm-async.c @@ -0,0 +1,523 @@ +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "qapi/qmp/qerror.h" +#include "qemu/error-report.h" +#include "sysemu/sysemu.h" +#include "qmp-commands.h" +#include "qemu-options.h" +#include "migration/qemu-file.h" +#include "qom/qom-qobject.h" +#include "migration/migration.h" +#include "block/snapshot.h" +#include "block/qapi.h" +#include "block/block.h" +#include "qemu/timer.h" +#include "sysemu/block-backend.h" +#include "qapi/qmp/qstring.h" +#include "qemu/rcu.h" +#include "qemu/thread.h" +#include "qemu/cutils.h" + +/* #define DEBUG_SAVEVM_STATE */ + +#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ + +#ifdef DEBUG_SAVEVM_STATE +#define DPRINTF(fmt, ...) \ + do { printf("savevm-async: " fmt, ## __VA_ARGS__); } while (0) +#else +#define DPRINTF(fmt, ...) \ + do { } while (0) +#endif + +enum { + SAVE_STATE_DONE, + SAVE_STATE_ERROR, + SAVE_STATE_ACTIVE, + SAVE_STATE_COMPLETED, + SAVE_STATE_CANCELLED +}; + + +static struct SnapshotState { + BlockBackend *target; + size_t bs_pos; + int state; + Error *error; + Error *blocker; + int saved_vm_running; + QEMUFile *file; + int64_t total_time; +} snap_state; + +SaveVMInfo *qmp_query_savevm(Error **errp) +{ + SaveVMInfo *info = g_malloc0(sizeof(*info)); + struct SnapshotState *s = &snap_state; + + if (s->state != SAVE_STATE_DONE) { + info->has_bytes = true; + info->bytes = s->bs_pos; + switch (s->state) { + case SAVE_STATE_ERROR: + info->has_status = true; + info->status = g_strdup("failed"); + info->has_total_time = true; + info->total_time = s->total_time; + if (s->error) { + info->has_error = true; + info->error = g_strdup(error_get_pretty(s->error)); + } + break; + case SAVE_STATE_ACTIVE: + info->has_status = true; + info->status = g_strdup("active"); + info->has_total_time = true; + info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + - s->total_time; + break; + case SAVE_STATE_COMPLETED: + info->has_status = true; + info->status = g_strdup("completed"); + info->has_total_time = true; + info->total_time = s->total_time; + break; + } + } + + return info; +} + +static int save_snapshot_cleanup(void) +{ + int ret = 0; + + DPRINTF("save_snapshot_cleanup\n"); + + snap_state.total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - + snap_state.total_time; + + if (snap_state.file) { + ret = qemu_fclose(snap_state.file); + } + + if (snap_state.target) { + /* try to truncate, but ignore errors (will fail on block devices). + * note: bdrv_read() need whole blocks, so we round up + */ + size_t size = (snap_state.bs_pos + BDRV_SECTOR_SIZE) & BDRV_SECTOR_MASK; + blk_truncate(snap_state.target, size); + blk_op_unblock_all(snap_state.target, snap_state.blocker); + error_free(snap_state.blocker); + snap_state.blocker = NULL; + blk_unref(snap_state.target); + snap_state.target = NULL; + } + + return ret; +} + +static void save_snapshot_error(const char *fmt, ...) +{ + va_list ap; + char *msg; + + va_start(ap, fmt); + msg = g_strdup_vprintf(fmt, ap); + va_end(ap); + + DPRINTF("save_snapshot_error: %s\n", msg); + + if (!snap_state.error) { + error_set(&snap_state.error, ERROR_CLASS_GENERIC_ERROR, "%s", msg); + } + + g_free (msg); + + snap_state.state = SAVE_STATE_ERROR; + + save_snapshot_cleanup(); +} + +static void save_snapshot_completed(void) +{ + DPRINTF("save_snapshot_completed\n"); + + if (save_snapshot_cleanup() < 0) { + snap_state.state = SAVE_STATE_ERROR; + } else { + snap_state.state = SAVE_STATE_COMPLETED; + } +} + +static int block_state_close(void *opaque) +{ + snap_state.file = NULL; + return blk_flush(snap_state.target); +} + +static ssize_t block_state_writev_buffer(void *opaque, struct iovec *iov, + int iovcnt, int64_t pos) +{ + int ret; + QEMUIOVector qiov; + + qemu_iovec_init_external(&qiov, iov, iovcnt); + ret = blk_co_pwritev(snap_state.target, pos, qiov.size, &qiov, 0); + if (ret < 0) { + return ret; + } + snap_state.bs_pos += qiov.size; + return qiov.size; +} + +static int store_and_stop(void) { + if (global_state_store()) { + save_snapshot_error("Error saving global state"); + return 1; + } + if (runstate_is_running()) { + vm_stop(RUN_STATE_SAVE_VM); + } + return 0; +} + +static void process_savevm_co(void *opaque) +{ + int ret; + int64_t maxlen; + MigrationParams params = { + .blk = 0, + .shared = 0 + }; + + snap_state.state = SAVE_STATE_ACTIVE; + + qemu_mutex_unlock_iothread(); + qemu_savevm_state_header(snap_state.file); + ret = qemu_savevm_state_begin(snap_state.file, ¶ms); + qemu_mutex_lock_iothread(); + + if (ret < 0) { + save_snapshot_error("qemu_savevm_state_begin failed"); + return; + } + + while (snap_state.state == SAVE_STATE_ACTIVE) { + uint64_t pending_size, pend_post, pend_nonpost; + + qemu_savevm_state_pending(snap_state.file, 0, &pend_nonpost, &pend_post); + pending_size = pend_post + pend_nonpost; + + if (pending_size) { + ret = qemu_savevm_state_iterate(snap_state.file, false); + if (ret < 0) { + save_snapshot_error("qemu_savevm_state_iterate error %d", ret); + break; + } + DPRINTF("savevm inerate pending size %lu ret %d\n", pending_size, ret); + } else { + DPRINTF("done iterating\n"); + if (store_and_stop()) + break; + DPRINTF("savevm inerate finished\n"); + qemu_savevm_state_complete_precopy(snap_state.file, false); + DPRINTF("save complete\n"); + save_snapshot_completed(); + break; + } + + /* stop the VM if we get to the end of available space, + * or if pending_size is just a few MB + */ + maxlen = blk_getlength(snap_state.target) - 30*1024*1024; + if ((pending_size < 100000) || + ((snap_state.bs_pos + pending_size) >= maxlen)) { + if (store_and_stop()) + break; + } + } + + if(snap_state.state == SAVE_STATE_CANCELLED) { + save_snapshot_completed(); + Error *errp = NULL; + qmp_savevm_end(&errp); + } + +} + +static const QEMUFileOps block_file_ops = { + .writev_buffer = block_state_writev_buffer, + .close = block_state_close, +}; + + +void qmp_savevm_start(bool has_statefile, const char *statefile, Error **errp) +{ + Error *local_err = NULL; + + int bdrv_oflags = BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_NO_FLUSH; + + if (snap_state.state != SAVE_STATE_DONE) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, + "VM snapshot already started\n"); + return; + } + + /* initialize snapshot info */ + snap_state.saved_vm_running = runstate_is_running(); + snap_state.bs_pos = 0; + snap_state.total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); + snap_state.blocker = NULL; + + if (snap_state.error) { + error_free(snap_state.error); + snap_state.error = NULL; + } + + if (!has_statefile) { + vm_stop(RUN_STATE_SAVE_VM); + snap_state.state = SAVE_STATE_COMPLETED; + return; + } + + if (qemu_savevm_state_blocked(errp)) { + return; + } + + /* Open the image */ + QDict *options = NULL; + options = qdict_new(); + qdict_put(options, "driver", qstring_from_str("raw")); + snap_state.target = blk_new_open(statefile, NULL, options, bdrv_oflags, &local_err); + if (!snap_state.target) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, "failed to open '%s'", statefile); + goto restart; + } + + snap_state.file = qemu_fopen_ops(&snap_state, &block_file_ops); + + if (!snap_state.file) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, "failed to open '%s'", statefile); + goto restart; + } + + + error_setg(&snap_state.blocker, "block device is in use by savevm"); + blk_op_block_all(snap_state.target, snap_state.blocker); + + Coroutine *co = qemu_coroutine_create(process_savevm_co, NULL); + qemu_coroutine_enter(co); + + return; + +restart: + + save_snapshot_error("setup failed"); + + if (snap_state.saved_vm_running) { + vm_start(); + } +} + +void qmp_savevm_end(Error **errp) +{ + if (snap_state.state == SAVE_STATE_DONE) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, + "VM snapshot not started\n"); + return; + } + + if (snap_state.state == SAVE_STATE_ACTIVE) { + snap_state.state = SAVE_STATE_CANCELLED; + return; + } + + if (snap_state.saved_vm_running) { + vm_start(); + } + + snap_state.state = SAVE_STATE_DONE; +} + +void qmp_snapshot_drive(const char *device, const char *name, Error **errp) +{ + BlockBackend *blk; + BlockDriverState *bs; + QEMUSnapshotInfo sn1, *sn = &sn1; + int ret; +#ifdef _WIN32 + struct _timeb tb; +#else + struct timeval tv; +#endif + + if (snap_state.state != SAVE_STATE_COMPLETED) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, + "VM snapshot not ready/started\n"); + return; + } + + blk = blk_by_name(device); + if (!blk) { + error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, + "Device '%s' not found", device); + return; + } + + bs = blk_bs(blk); + if (!bdrv_is_inserted(bs)) { + error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device); + return; + } + + if (bdrv_is_read_only(bs)) { + error_setg(errp, "Node '%s' is read only", device); + return; + } + + if (!bdrv_can_snapshot(bs)) { + error_setg(errp, QERR_UNSUPPORTED); + return; + } + + if (bdrv_snapshot_find(bs, sn, name) >= 0) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, + "snapshot '%s' already exists", name); + return; + } + + sn = &sn1; + memset(sn, 0, sizeof(*sn)); + +#ifdef _WIN32 + _ftime(&tb); + sn->date_sec = tb.time; + sn->date_nsec = tb.millitm * 1000000; +#else + gettimeofday(&tv, NULL); + sn->date_sec = tv.tv_sec; + sn->date_nsec = tv.tv_usec * 1000; +#endif + sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + + pstrcpy(sn->name, sizeof(sn->name), name); + + sn->vm_state_size = 0; /* do not save state */ + + ret = bdrv_snapshot_create(bs, sn); + if (ret < 0) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, + "Error while creating snapshot on '%s'\n", device); + return; + } +} + +void qmp_delete_drive_snapshot(const char *device, const char *name, + Error **errp) +{ + BlockBackend *blk; + BlockDriverState *bs; + QEMUSnapshotInfo sn1, *sn = &sn1; + Error *local_err = NULL; + + int ret; + + blk = blk_by_name(device); + if (!blk) { + error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, + "Device '%s' not found", device); + return; + } + + bs = blk_bs(blk); + if (bdrv_is_read_only(bs)) { + error_setg(errp, "Node '%s' is read only", device); + return; + } + + if (!bdrv_can_snapshot(bs)) { + error_setg(errp, QERR_UNSUPPORTED); + return; + } + + if (bdrv_snapshot_find(bs, sn, name) < 0) { + /* return success if snapshot does not exists */ + return; + } + + ret = bdrv_snapshot_delete(bs, NULL, name, &local_err); + if (ret < 0) { + error_set(errp, ERROR_CLASS_GENERIC_ERROR, + "Error while deleting snapshot on '%s'\n", device); + return; + } +} + +static ssize_t loadstate_get_buffer(void *opaque, uint8_t *buf, int64_t pos, + size_t size) +{ + BlockBackend *be = opaque; + int64_t maxlen = blk_getlength(be); + if (pos > maxlen) { + return -EIO; + } + if ((pos + size) > maxlen) { + size = maxlen - pos - 1; + } + if (size == 0) { + return 0; + } + return blk_pread(be, pos, buf, size); +} + +static const QEMUFileOps loadstate_file_ops = { + .get_buffer = loadstate_get_buffer, +}; + +int load_state_from_blockdev(const char *filename) +{ + BlockBackend *be; + Error *local_err = NULL; + Error *blocker = NULL; + + QEMUFile *f; + int ret = -EINVAL; + + be = blk_new_open(filename, NULL, NULL, 0, &local_err); + + if (!be) { + error_report("Could not open VM state file"); + goto the_end; + } + + error_setg(&blocker, "block device is in use by load state"); + blk_op_block_all(be, blocker); + + /* restore the VM state */ + f = qemu_fopen_ops(be, &loadstate_file_ops); + if (!f) { + error_report("Could not open VM state file"); + goto the_end; + } + + qemu_system_reset(VMRESET_SILENT); + ret = qemu_loadvm_state(f); + + qemu_fclose(f); + migration_incoming_state_destroy(); + if (ret < 0) { + error_report("Error %d while loading VM state", ret); + goto the_end; + } + + ret = 0; + + the_end: + if (be) { + blk_op_unblock_all(be, blocker); + error_free(blocker); + blk_unref(be); + } + return ret; +} diff --git a/vl.c b/vl.c index 868c4893df..19afd47871 100644 --- a/vl.c +++ b/vl.c @@ -2960,6 +2960,7 @@ int main(int argc, char **argv, char **envp) int optind; const char *optarg; const char *loadvm = NULL; + const char *loadstate = NULL; MachineClass *machine_class; const char *cpu_model; const char *vga_model = NULL; @@ -3631,6 +3632,9 @@ int main(int argc, char **argv, char **envp) case QEMU_OPTION_loadvm: loadvm = optarg; break; + case QEMU_OPTION_loadstate: + loadstate = optarg; + break; case QEMU_OPTION_full_screen: full_screen = 1; break; @@ -4689,6 +4693,10 @@ int main(int argc, char **argv, char **envp) if (load_vmstate(loadvm) < 0) { autostart = 0; } + } else if (loadstate) { + if (load_state_from_blockdev(loadstate) < 0) { + autostart = 0; + } } qdev_prop_check_globals(); -- 2.11.0