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pve-qemu-qoup/debian/patches/pve/0018-PVE-internal-snapshot-async.patch
Wolfgang Bumiller 53e83913af bump version to 3.0.0-1 
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
2018-09-07 14:52:23 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
Date: Wed, 9 Dec 2015 16:04:32 +0100
Subject: [PATCH] PVE: internal snapshot async
---
Makefile.objs | 1 +
hmp-commands-info.hx | 13 ++
hmp-commands.hx | 32 +++
hmp.c | 57 +++++
hmp.h | 5 +
include/migration/snapshot.h | 1 +
qapi/migration.json | 34 +++
qapi/misc.json | 32 +++
qemu-options.hx | 13 ++
savevm-async.c | 528 +++++++++++++++++++++++++++++++++++++++++++
vl.c | 10 +
11 files changed, 726 insertions(+)
create mode 100644 savevm-async.c
diff --git a/Makefile.objs b/Makefile.objs
index 7a9828da28..a836ee87d7 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -98,6 +98,7 @@ ifeq ($(CONFIG_SOFTMMU),y)
common-obj-y = blockdev.o blockdev-nbd.o block/
common-obj-y += bootdevice.o iothread.o
common-obj-y += job-qmp.o
+common-obj-y += savevm-async.o
common-obj-y += net/
common-obj-y += qdev-monitor.o device-hotplug.o
common-obj-$(CONFIG_WIN32) += os-win32.o
diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index 70639f656a..42c148fdc9 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -575,6 +575,19 @@ 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 91dfe51c37..a6f0720442 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1886,3 +1886,35 @@ 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 4d60782f56..7c975f3ead 100644
--- a/hmp.c
+++ b/hmp.c
@@ -2558,6 +2558,63 @@ void hmp_info_memory_devices(Monitor *mon, const QDict *qdict)
hmp_handle_error(mon, &err);
}
+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 33354f1bdd..98bb7a44db 100644
--- a/hmp.h
+++ b/hmp.h
@@ -24,6 +24,7 @@ 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);
@@ -98,6 +99,10 @@ 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/migration/snapshot.h b/include/migration/snapshot.h
index c85b6ec75b..4411b7121d 100644
--- a/include/migration/snapshot.h
+++ b/include/migration/snapshot.h
@@ -17,5 +17,6 @@
int save_snapshot(const char *name, Error **errp);
int load_snapshot(const char *name, Error **errp);
+int load_snapshot_from_blockdev(const char *filename, Error **errp);
#endif
diff --git a/qapi/migration.json b/qapi/migration.json
index 186e8a7303..8d2626f6ad 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -189,6 +189,40 @@
'*postcopy-vcpu-blocktime': ['uint32']} }
##
+# @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
diff --git a/qapi/misc.json b/qapi/misc.json
index 4e8ebf9adc..b6ad5f028d 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -2525,6 +2525,38 @@
{ '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' }
+
+##
# @AcpiTableOptions:
#
# Specify an ACPI table on the command line to load.
diff --git a/qemu-options.hx b/qemu-options.hx
index b1bf0f485f..31329e26e2 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3520,6 +3520,19 @@ 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..0bf830c906
--- /dev/null
+++ b/savevm-async.c
@@ -0,0 +1,528 @@
+#include "qemu/osdep.h"
+#include "migration/migration.h"
+#include "migration/savevm.h"
+#include "migration/snapshot.h"
+#include "migration/global_state.h"
+#include "migration/ram.h"
+#include "migration/qemu-file.h"
+#include "qapi/qmp/qerror.h"
+#include "sysemu/sysemu.h"
+#include "qmp-commands.h"
+#include "block/block.h"
+#include "sysemu/block-backend.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qerror.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qapi-commands-migration.h"
+#include "qapi/qapi-commands-misc.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, PREALLOC_MODE_OFF, NULL);
+ 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;
+
+ snap_state.state = SAVE_STATE_ACTIVE;
+
+ qemu_mutex_unlock_iothread();
+ qemu_savevm_state_header(snap_state.file);
+ qemu_savevm_state_setup(snap_state.file);
+ ret = qemu_file_get_error(snap_state.file);
+ qemu_mutex_lock_iothread();
+
+ if (ret < 0) {
+ save_snapshot_error("qemu_savevm_state_setup 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");
+ /* upstream made the return value here inconsistent
+ * (-1 instead of 'ret' in one case and 0 after flush which can
+ * still set a file error...)
+ */
+ (void)qemu_savevm_state_complete_precopy(snap_state.file, false, false);
+ ret = qemu_file_get_error(snap_state.file);
+ if (ret < 0) {
+ save_snapshot_error("qemu_savevm_state_iterate error %d", ret);
+ break;
+ }
+ 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_str(options, "driver", "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_snapshot_from_blockdev(const char *filename, Error **errp)
+{
+ 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_setg(errp, "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_setg(errp, "Could not open VM state file");
+ goto the_end;
+ }
+
+ qemu_system_reset(SHUTDOWN_CAUSE_NONE);
+ ret = qemu_loadvm_state(f);
+
+ qemu_fclose(f);
+ migration_incoming_state_destroy();
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Error while loading VM state");
+ 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 c750b7c18e..b2e3e23724 100644
--- a/vl.c
+++ b/vl.c
@@ -2927,6 +2927,7 @@ 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;
@@ -3528,6 +3529,9 @@ 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:
dpy.has_full_screen = true;
dpy.full_screen = true;
@@ -4623,6 +4627,12 @@ int main(int argc, char **argv, char **envp)
error_report_err(local_err);
autostart = 0;
}
+ } else if (loadstate) {
+ Error *local_err = NULL;
+ if (load_snapshot_from_blockdev(loadstate, &local_err) < 0) {
+ error_report_err(local_err);
+ autostart = 0;
+ }
}
qdev_prop_check_globals();
--
2.11.0
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