try to use better names

[pve-qemu-kvm.git] / debian / patches / internal-snapshot-async.patch

Index: new/qapi-schema.json
===================================================================
--- new.orig/qapi-schema.json	2012-09-24 06:12:15.000000000 +0200
+++ new/qapi-schema.json	2012-09-24 06:14:10.000000000 +0200
@@ -358,6 +358,40 @@
            '*total-time': 'int'} }
 
 ##
+# @SaveVMInfo
+#
+# Information about current migration process.
+#
+# @status: #optional 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: #optional string containing error message is status is failed.
+#
+# @total-time: #optional total amount of milliseconds since savevm started.
+#        If savevm has ended, it returns the total save time
+#
+# @bytes: #optional total amount of data transfered
+#
+# Since: 1.3
+##
+{ 'type': '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.
@@ -2493,3 +2527,12 @@
 # Since: 1.2.0
 ##
 { 'command': 'query-target', 'returns': 'TargetInfo' }
+
+
+{ 'command': 'savevm-start' 'data': { '*statefile': 'str' } }
+
+{ 'command': 'snapshot-drive', 'data': { 'device': 'str', 'name': 'str' } }
+
+{ 'command': 'delete-drive-snapshot', 'data': { 'device': 'str', 'name': 'str' } }
+
+{ 'command': 'savevm-end' }
Index: new/qmp-commands.hx
===================================================================
--- new.orig/qmp-commands.hx	2012-09-24 06:12:15.000000000 +0200
+++ new/qmp-commands.hx	2012-09-24 06:15:13.000000000 +0200
@@ -2514,3 +2514,27 @@
         .args_type  = "",
         .mhandler.cmd_new = qmp_marshal_input_query_target,
     },
+
+    {
+        .name       = "savevm-start",
+        .args_type  = "statefile:s?",
+        .mhandler.cmd_new = qmp_marshal_input_savevm_start,
+    },
+
+    {
+        .name       = "snapshot-drive",
+        .args_type  = "device:s,name:s",
+        .mhandler.cmd_new = qmp_marshal_input_snapshot_drive,
+    },
+
+    {
+        .name       = "delete-drive-snapshot",
+        .args_type  = "device:s,name:s",
+        .mhandler.cmd_new = qmp_marshal_input_delete_drive_snapshot,
+    },
+
+    {
+        .name       = "savevm-end",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_savevm_end,
+    },
Index: new/hmp.c
===================================================================
--- new.orig/hmp.c	2012-09-24 06:12:15.000000000 +0200
+++ new/hmp.c	2012-09-24 06:21:35.000000000 +0200
@@ -1102,3 +1102,60 @@
     qmp_closefd(fdname, &errp);
     hmp_handle_error(mon, &errp);
 }
+
+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)
+{
+    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);
+    }
+}
Index: new/hmp.h
===================================================================
--- new.orig/hmp.h	2012-09-24 06:12:15.000000000 +0200
+++ new/hmp.h	2012-09-24 06:23:00.000000000 +0200
@@ -25,6 +25,7 @@
 void hmp_info_uuid(Monitor *mon);
 void hmp_info_chardev(Monitor *mon);
 void hmp_info_mice(Monitor *mon);
+void hmp_info_savevm(Monitor *mon);
 void hmp_info_migrate(Monitor *mon);
 void hmp_info_migrate_capabilities(Monitor *mon);
 void hmp_info_migrate_cache_size(Monitor *mon);
@@ -71,5 +72,9 @@
 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);
 
 #endif
Index: new/hmp-commands.hx
===================================================================
--- new.orig/hmp-commands.hx	2012-09-24 06:12:15.000000000 +0200
+++ new/hmp-commands.hx	2012-09-24 06:16:14.000000000 +0200
@@ -1468,6 +1468,8 @@
 show current migration capabilities
 @item info migrate_cache_size
 show current migration XBZRLE cache size
+@item info savevm
+show savevm status
 @item info balloon
 show balloon information
 @item info qtree
@@ -1494,3 +1496,35 @@
 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.",
+        .mhandler.cmd = hmp_savevm_start,
+    },
+
+    {
+        .name       = "snapshot-drive",
+        .args_type  = "device:s,name:s",
+        .params     = "device name",
+        .help       = "Create internal snapshot.",
+        .mhandler.cmd = hmp_snapshot_drive,
+    },
+
+    {
+        .name       = "delete-drive-snapshot",
+        .args_type  = "device:s,name:s",
+        .params     = "device name",
+        .help       = "Delete internal snapshot.",
+        .mhandler.cmd = hmp_delete_drive_snapshot,
+    },
+
+    {
+        .name       = "savevm-end",
+        .args_type  = "",
+        .params     = "",
+        .help       = "Resume VM after snaphot.",
+        .mhandler.cmd = hmp_savevm_end,
+    },
Index: new/savevm-async.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ new/savevm-async.c	2012-09-24 06:19:58.000000000 +0200
@@ -0,0 +1,441 @@
+#include "qemu-common.h"
+#include "qerror.h"
+#include "sysemu.h"
+#include "qmp-commands.h"
+#include "blockdev.h"
+#include "qemu/qom-qobject.h"
+#include "buffered_file.h"
+#include "migration.h"
+
+//#define DEBUG_SAVEVM_STATE
+
+#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,
+};
+
+static struct SnapshotState {
+    BlockDriverState *bs;
+    size_t bs_pos;
+    int state;
+    Error *error;
+    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_get_clock_ms(rt_clock)
+                - 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_get_clock_ms(rt_clock) -
+        snap_state.total_time;
+
+    if (snap_state.file) {
+        ret = qemu_fclose(snap_state.file);
+    }
+
+    if (snap_state.bs) {
+        // 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;
+        bdrv_truncate(snap_state.bs, size);
+
+        bdrv_delete(snap_state.bs);
+        snap_state.bs = 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 bdrv_flush(snap_state.bs);
+}
+
+static ssize_t block_state_put_buffer(void *opaque, const void *buf,
+                                      size_t size)
+{
+    int ret;
+
+    if ((ret = bdrv_pwrite(snap_state.bs, snap_state.bs_pos, buf, size)) > 0) {
+        snap_state.bs_pos += ret;
+    }
+
+    return ret;
+}
+
+static void block_state_put_ready(void *opaque)
+{
+    int ret;
+
+    if (snap_state.state != SAVE_STATE_ACTIVE) {
+        save_snapshot_error("put_ready returning because of non-active state");
+        return;
+    }
+
+    if (!runstate_check(RUN_STATE_SAVE_VM)) {
+        save_snapshot_error("put_ready returning because of wrong run state");
+        return;
+    }
+
+    ret = qemu_savevm_state_iterate(snap_state.file);
+    if (ret < 0) {
+        save_snapshot_error("qemu_savevm_state_iterate error %d", ret);
+        return;
+    } else if (ret == 1) {
+        DPRINTF("savevm inerate finished\n");
+        if ((ret = qemu_savevm_state_complete(snap_state.file)) < 0) {
+            save_snapshot_error("qemu_savevm_state_complete error %d", ret);
+            return;
+        } else {
+            DPRINTF("save complete\n");
+            save_snapshot_completed();
+            return;
+        }
+    }
+}
+
+static void block_state_wait_for_unfreeze(void *opaque)
+{
+    /* do nothing here - should not be called */
+}
+
+void qmp_savevm_start(bool has_statefile, const char *statefile, Error **errp)
+{
+    BlockDriver *drv = NULL;
+    int bdrv_oflags = BDRV_O_CACHE_WB | BDRV_O_RDWR;
+    MigrationParams params = {
+        .blk = 0,
+        .shared = 0
+    };
+    int ret;
+
+    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_get_clock_ms(rt_clock);
+
+    if (snap_state.error) {
+        error_free(snap_state.error);
+        snap_state.error = NULL;
+    }
+
+    /* stop the VM */
+    vm_stop(RUN_STATE_SAVE_VM);
+
+    if (!has_statefile) {
+        snap_state.state = SAVE_STATE_COMPLETED;
+        return;
+    }
+
+    if (qemu_savevm_state_blocked(errp)) {
+        return;
+    }
+
+    /* Open the image */
+    snap_state.bs = bdrv_new("vmstate");
+    ret = bdrv_open(snap_state.bs, statefile, bdrv_oflags, drv);
+    if (ret < 0) {
+        error_set(errp, QERR_OPEN_FILE_FAILED, statefile);
+        goto restart;
+    }
+
+    snap_state.file = qemu_fopen_ops_buffered(&snap_state, 1000, //000000,
+                                              block_state_put_buffer,
+                                              block_state_put_ready,
+                                              block_state_wait_for_unfreeze,
+                                              block_state_close);
+
+    if (!snap_state.file) {
+        error_set(errp, QERR_OPEN_FILE_FAILED, statefile);
+        goto restart;
+    }
+
+    snap_state.state = SAVE_STATE_ACTIVE;
+
+    ret = qemu_savevm_state_begin(snap_state.file, &params);
+    if (ret < 0) {
+        error_set(errp, ERROR_CLASS_GENERIC_ERROR,
+                  "qemu_savevm_state_begin failed\n");
+        goto restart;
+    }
+
+    block_state_put_ready(&snap_state);
+
+    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.saved_vm_running) {
+        vm_start();
+    }
+
+    snap_state.state = SAVE_STATE_DONE;
+}
+
+void qmp_snapshot_drive(const char *device, const char *name, Error **errp)
+{
+    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;
+    }
+
+    bs = bdrv_find(device);
+    if (!bs) {
+        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+        return;
+    }
+
+    if (!bdrv_is_inserted(bs)) {
+        error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
+        return;
+    }
+
+    if (bdrv_is_read_only(bs)) {
+        error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
+        return;
+    }
+
+    if (!bdrv_can_snapshot(bs)) {
+        error_set(errp, QERR_NOT_SUPPORTED);
+        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_get_clock_ns(vm_clock);
+
+    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)
+{
+    BlockDriverState *bs;
+    QEMUSnapshotInfo sn1, *sn = &sn1;
+    int ret;
+
+    bs = bdrv_find(device);
+    if (!bs) {
+        error_set(errp, QERR_DEVICE_NOT_FOUND, device);
+        return;
+    }
+    if (bdrv_is_read_only(bs)) {
+        error_set(errp, QERR_DEVICE_IS_READ_ONLY, device);
+        return;
+    }
+
+    if (!bdrv_can_snapshot(bs)) {
+        error_set(errp, QERR_NOT_SUPPORTED);
+        return;
+    }
+
+    if (bdrv_snapshot_find(bs, sn, name) < 0) {
+        /* return success if snapshot does not exists */
+        return;
+    }
+
+    ret = bdrv_snapshot_delete(bs, name);
+    if (ret < 0) {
+        error_set(errp, ERROR_CLASS_GENERIC_ERROR,
+                  "Error while deleting snapshot on '%s'\n", device);
+        return;
+    }
+}
+
+static int loadstate_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
+{
+    BlockDriverState *bs = (BlockDriverState *)opaque;
+    int64_t maxlen = bdrv_getlength(bs);
+    if (pos > maxlen) {
+        return -EIO;
+    }
+    if ((pos + size) > maxlen) {
+        size = maxlen - pos - 1;
+    }
+    if (size == 0) {
+        return 0;
+    }
+    return bdrv_pread(bs, pos, buf, size);
+}
+
+int load_state_from_blockdev(const char *filename)
+{
+    BlockDriverState *bs = NULL;
+    BlockDriver *drv = NULL;
+    QEMUFile *f;
+    int ret = -1;
+
+    bs = bdrv_new("vmstate");
+    ret = bdrv_open(bs, filename, BDRV_O_CACHE_WB, drv);
+    if (ret < 0) {
+        error_report("Could not open VM state file");
+        goto the_end;
+    }
+
+    /* restore the VM state */
+    f = qemu_fopen_ops(bs, NULL, loadstate_get_buffer, NULL, NULL, NULL, NULL);
+    if (!f) {
+        error_report("Could not open VM state file");
+        ret = -EINVAL;
+        goto the_end;
+    }
+
+    qemu_system_reset(VMRESET_SILENT);
+    ret = qemu_loadvm_state(f);
+
+    qemu_fclose(f);
+    if (ret < 0) {
+        error_report("Error %d while loading VM state", ret);
+        goto the_end;
+    }
+
+    ret = 0;
+
+ the_end:
+    if (bs) {
+        bdrv_delete(bs);
+    }
+    return ret;
+}
Index: new/Makefile.objs
===================================================================
--- new.orig/Makefile.objs	2012-09-24 06:12:15.000000000 +0200
+++ new/Makefile.objs	2012-09-24 06:12:21.000000000 +0200
@@ -78,6 +78,7 @@
 common-obj-y += pflib.o
 common-obj-y += bitmap.o bitops.o
 common-obj-y += page_cache.o
+common-obj-y += savevm-async.o
 
 common-obj-$(CONFIG_POSIX) += migration-exec.o migration-unix.o migration-fd.o
 common-obj-$(CONFIG_WIN32) += version.o
Index: new/sysemu.h
===================================================================
--- new.orig/sysemu.h	2012-09-24 06:12:15.000000000 +0200
+++ new/sysemu.h	2012-09-24 06:12:21.000000000 +0200
@@ -72,6 +72,7 @@
 
 void do_savevm(Monitor *mon, const QDict *qdict);
 int load_vmstate(const char *name);
+int load_state_from_blockdev(const char *filename);
 void do_delvm(Monitor *mon, const QDict *qdict);
 void do_info_snapshots(Monitor *mon);
 
Index: new/qemu-options.hx
===================================================================
--- new.orig/qemu-options.hx	2012-09-24 06:12:21.000000000 +0200
+++ new/qemu-options.hx	2012-09-24 06:12:21.000000000 +0200
@@ -2477,6 +2477,19 @@
 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)
Index: new/vl.c
===================================================================
--- new.orig/vl.c	2012-09-24 06:12:21.000000000 +0200
+++ new/vl.c	2012-09-24 06:12:21.000000000 +0200
@@ -2364,6 +2364,7 @@
     int optind;
     const char *optarg;
     const char *loadvm = NULL;
+    const char *loadstate = NULL;
     QEMUMachine *machine;
     const char *cpu_model;
     const char *vga_model = "none";
@@ -2998,6 +2999,9 @@
 	    case QEMU_OPTION_loadvm:
 		loadvm = optarg;
 		break;
+            case QEMU_OPTION_loadstate:
+                loadstate = optarg;
+                break;
             case QEMU_OPTION_full_screen:
                 full_screen = 1;
                 break;
@@ -3821,6 +3825,10 @@
         if (load_vmstate(loadvm) < 0) {
             autostart = 0;
         }
+    } else if (loadstate) {
+        if (load_state_from_blockdev(loadstate) < 0) {
+            autostart = 0;
+        }
     }
 
     if (incoming) {