Merge remote-tracking branch 'quintela/migration-anthony-v2' into staging
* quintela/migration-anthony-v2:
Maintain the number of dirty pages
dirty bitmap: abstract its use
Exit loop if we have been there too long
Only calculate expected_time for stage 2
Only TCG needs TLB handling
No need to iterate if we already are over the limit
Add tracepoints for savevm section start/end
Add spent time for migration
Add migration_end function
Add debugging infrastructure
Add save_block_hdr function
Add MigrationParams structure
Add missing check for host_from_stream_offset return value for RAM_SAVE_FLAG_PAGE
diff --git a/arch_init.c b/arch_init.c
index a9e8b74..5b0f562 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -44,6 +44,14 @@
#include "exec-memory.h"
#include "hw/pcspk.h"
+#ifdef DEBUG_ARCH_INIT
+#define DPRINTF(fmt, ...) \
+ do { fprintf(stdout, "arch_init: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+ do { } while (0)
+#endif
+
#ifdef TARGET_SPARC
int graphic_width = 1024;
int graphic_height = 768;
@@ -161,6 +169,18 @@
return 1;
}
+static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
+ int cont, int flag)
+{
+ qemu_put_be64(f, offset | cont | flag);
+ if (!cont) {
+ qemu_put_byte(f, strlen(block->idstr));
+ qemu_put_buffer(f, (uint8_t *)block->idstr,
+ strlen(block->idstr));
+ }
+
+}
+
static RAMBlock *last_block;
static ram_addr_t last_offset;
@@ -187,21 +207,11 @@
p = memory_region_get_ram_ptr(mr) + offset;
if (is_dup_page(p)) {
- qemu_put_be64(f, offset | cont | RAM_SAVE_FLAG_COMPRESS);
- if (!cont) {
- qemu_put_byte(f, strlen(block->idstr));
- qemu_put_buffer(f, (uint8_t *)block->idstr,
- strlen(block->idstr));
- }
+ save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, *p);
bytes_sent = 1;
} else {
- qemu_put_be64(f, offset | cont | RAM_SAVE_FLAG_PAGE);
- if (!cont) {
- qemu_put_byte(f, strlen(block->idstr));
- qemu_put_buffer(f, (uint8_t *)block->idstr,
- strlen(block->idstr));
- }
+ save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
bytes_sent = TARGET_PAGE_SIZE;
}
@@ -228,20 +238,7 @@
static ram_addr_t ram_save_remaining(void)
{
- RAMBlock *block;
- ram_addr_t count = 0;
-
- QLIST_FOREACH(block, &ram_list.blocks, next) {
- ram_addr_t addr;
- for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
- if (memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE,
- DIRTY_MEMORY_MIGRATION)) {
- count++;
- }
- }
- }
-
- return count;
+ return ram_list.dirty_pages;
}
uint64_t ram_bytes_remaining(void)
@@ -294,16 +291,23 @@
g_free(blocks);
}
+static void migration_end(void)
+{
+ memory_global_dirty_log_stop();
+}
+
+#define MAX_WAIT 50 /* ms, half buffered_file limit */
+
int ram_save_live(QEMUFile *f, int stage, void *opaque)
{
ram_addr_t addr;
uint64_t bytes_transferred_last;
double bwidth = 0;
- uint64_t expected_time = 0;
int ret;
+ int i;
if (stage < 0) {
- memory_global_dirty_log_stop();
+ migration_end();
return 0;
}
@@ -340,6 +344,7 @@
bytes_transferred_last = bytes_transferred;
bwidth = qemu_get_clock_ns(rt_clock);
+ i = 0;
while ((ret = qemu_file_rate_limit(f)) == 0) {
int bytes_sent;
@@ -348,6 +353,20 @@
if (bytes_sent == 0) { /* no more blocks */
break;
}
+ /* we want to check in the 1st loop, just in case it was the 1st time
+ and we had to sync the dirty bitmap.
+ qemu_get_clock_ns() is a bit expensive, so we only check each some
+ iterations
+ */
+ if ((i & 63) == 0) {
+ uint64_t t1 = (qemu_get_clock_ns(rt_clock) - bwidth) / 1000000;
+ if (t1 > MAX_WAIT) {
+ DPRINTF("big wait: " PRIu64 " milliseconds, %d iterations\n",
+ t1, i);
+ break;
+ }
+ }
+ i++;
}
if (ret < 0) {
@@ -376,9 +395,16 @@
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
- expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
+ if (stage == 2) {
+ uint64_t expected_time;
+ expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
- return (stage == 2) && (expected_time <= migrate_max_downtime());
+ DPRINTF("ram_save_live: expected(" PRIu64 ") <= max(" PRIu64 ")?\n",
+ expected_time, migrate_max_downtime());
+
+ return expected_time <= migrate_max_downtime();
+ }
+ return 0;
}
static inline void *host_from_stream_offset(QEMUFile *f,
@@ -414,8 +440,11 @@
int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
- int flags;
+ int flags, ret = 0;
int error;
+ static uint64_t seq_iter;
+
+ seq_iter++;
if (version_id < 4 || version_id > 4) {
return -EINVAL;
@@ -445,8 +474,10 @@
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (!strncmp(id, block->idstr, sizeof(id))) {
- if (block->length != length)
- return -EINVAL;
+ if (block->length != length) {
+ ret = -EINVAL;
+ goto done;
+ }
break;
}
}
@@ -454,7 +485,8 @@
if (!block) {
fprintf(stderr, "Unknown ramblock \"%s\", cannot "
"accept migration\n", id);
- return -EINVAL;
+ ret = -EINVAL;
+ goto done;
}
total_ram_bytes -= length;
@@ -483,16 +515,23 @@
void *host;
host = host_from_stream_offset(f, addr, flags);
+ if (!host) {
+ return -EINVAL;
+ }
qemu_get_buffer(f, host, TARGET_PAGE_SIZE);
}
error = qemu_file_get_error(f);
if (error) {
- return error;
+ ret = error;
+ goto done;
}
} while (!(flags & RAM_SAVE_FLAG_EOS));
- return 0;
+done:
+ DPRINTF("Completed load of VM with exit code %d seq iteration " PRIu64 "\n",
+ ret, seq_iter);
+ return ret;
}
#ifdef HAS_AUDIO
diff --git a/block-migration.c b/block-migration.c
index fd2ffff..b95b4e1 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -700,13 +700,13 @@
return 0;
}
-static void block_set_params(int blk_enable, int shared_base, void *opaque)
+static void block_set_params(const MigrationParams *params, void *opaque)
{
- block_mig_state.blk_enable = blk_enable;
- block_mig_state.shared_base = shared_base;
+ block_mig_state.blk_enable = params->blk;
+ block_mig_state.shared_base = params->shared;
/* shared base means that blk_enable = 1 */
- block_mig_state.blk_enable |= shared_base;
+ block_mig_state.blk_enable |= params->shared;
}
void blk_mig_init(void)
diff --git a/cpu-all.h b/cpu-all.h
index 9dc249a..82ba1d7 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -486,6 +486,7 @@
typedef struct RAMList {
uint8_t *phys_dirty;
QLIST_HEAD(, RAMBlock) blocks;
+ uint64_t dirty_pages;
} RAMList;
extern RAMList ram_list;
diff --git a/exec-obsolete.h b/exec-obsolete.h
index 792c831..c099256 100644
--- a/exec-obsolete.h
+++ b/exec-obsolete.h
@@ -45,57 +45,71 @@
#define CODE_DIRTY_FLAG 0x02
#define MIGRATION_DIRTY_FLAG 0x08
-/* read dirty bit (return 0 or 1) */
-static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
-{
- return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] == 0xff;
-}
-
static inline int cpu_physical_memory_get_dirty_flags(ram_addr_t addr)
{
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS];
}
+/* read dirty bit (return 0 or 1) */
+static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
+{
+ return cpu_physical_memory_get_dirty_flags(addr) == 0xff;
+}
+
static inline int cpu_physical_memory_get_dirty(ram_addr_t start,
ram_addr_t length,
int dirty_flags)
{
int ret = 0;
- uint8_t *p;
ram_addr_t addr, end;
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
- p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS);
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
- ret |= *p++ & dirty_flags;
+ ret |= cpu_physical_memory_get_dirty_flags(addr) & dirty_flags;
}
return ret;
}
-static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
-{
- ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] = 0xff;
-}
-
static inline int cpu_physical_memory_set_dirty_flags(ram_addr_t addr,
int dirty_flags)
{
+ if ((dirty_flags & MIGRATION_DIRTY_FLAG) &&
+ !cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE,
+ MIGRATION_DIRTY_FLAG)) {
+ ram_list.dirty_pages++;
+ }
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flags;
}
+static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
+{
+ cpu_physical_memory_set_dirty_flags(addr, 0xff);
+}
+
+static inline int cpu_physical_memory_clear_dirty_flags(ram_addr_t addr,
+ int dirty_flags)
+{
+ int mask = ~dirty_flags;
+
+ if ((dirty_flags & MIGRATION_DIRTY_FLAG) &&
+ cpu_physical_memory_get_dirty(addr, TARGET_PAGE_SIZE,
+ MIGRATION_DIRTY_FLAG)) {
+ ram_list.dirty_pages--;
+ }
+ return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] &= mask;
+}
+
static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
ram_addr_t length,
int dirty_flags)
{
- uint8_t *p;
ram_addr_t addr, end;
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
- p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS);
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
- *p++ |= dirty_flags;
+ cpu_physical_memory_set_dirty_flags(addr, dirty_flags);
}
}
@@ -103,16 +117,12 @@
ram_addr_t length,
int dirty_flags)
{
- int mask;
- uint8_t *p;
ram_addr_t addr, end;
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
- mask = ~dirty_flags;
- p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS);
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
- *p++ &= mask;
+ cpu_physical_memory_clear_dirty_flags(addr, dirty_flags);
}
}
diff --git a/exec.c b/exec.c
index 8244d54..dd4833d 100644
--- a/exec.c
+++ b/exec.c
@@ -1824,19 +1824,10 @@
TB_JMP_PAGE_SIZE * sizeof(TranslationBlock *));
}
-/* Note: start and end must be within the same ram block. */
-void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
- int dirty_flags)
+static void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t end,
+ uintptr_t length)
{
- uintptr_t length, start1;
-
- start &= TARGET_PAGE_MASK;
- end = TARGET_PAGE_ALIGN(end);
-
- length = end - start;
- if (length == 0)
- return;
- cpu_physical_memory_mask_dirty_range(start, length, dirty_flags);
+ uintptr_t start1;
/* we modify the TLB cache so that the dirty bit will be set again
when accessing the range */
@@ -1848,6 +1839,26 @@
abort();
}
cpu_tlb_reset_dirty_all(start1, length);
+
+}
+
+/* Note: start and end must be within the same ram block. */
+void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
+ int dirty_flags)
+{
+ uintptr_t length;
+
+ start &= TARGET_PAGE_MASK;
+ end = TARGET_PAGE_ALIGN(end);
+
+ length = end - start;
+ if (length == 0)
+ return;
+ cpu_physical_memory_mask_dirty_range(start, length, dirty_flags);
+
+ if (tcg_enabled()) {
+ tlb_reset_dirty_range_all(start, end, length);
+ }
}
int cpu_physical_memory_set_dirty_tracking(int enable)
@@ -2554,8 +2565,7 @@
ram_list.phys_dirty = g_realloc(ram_list.phys_dirty,
last_ram_offset() >> TARGET_PAGE_BITS);
- memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
- 0xff, size >> TARGET_PAGE_BITS);
+ cpu_physical_memory_set_dirty_range(new_block->offset, size, 0xff);
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);
diff --git a/hmp.c b/hmp.c
index b9cec1d..4c6d4ae 100644
--- a/hmp.c
+++ b/hmp.c
@@ -145,6 +145,8 @@
info->ram->remaining >> 10);
monitor_printf(mon, "total ram: %" PRIu64 " kbytes\n",
info->ram->total >> 10);
+ monitor_printf(mon, "total time: %" PRIu64 " milliseconds\n",
+ info->ram->total_time);
}
if (info->has_disk) {
diff --git a/migration.c b/migration.c
index 3f485d3..8db1b43 100644
--- a/migration.c
+++ b/migration.c
@@ -131,6 +131,8 @@
info->ram->transferred = ram_bytes_transferred();
info->ram->remaining = ram_bytes_remaining();
info->ram->total = ram_bytes_total();
+ info->ram->total_time = qemu_get_clock_ms(rt_clock)
+ - s->total_time;
if (blk_mig_active()) {
info->has_disk = true;
@@ -143,6 +145,13 @@
case MIG_STATE_COMPLETED:
info->has_status = true;
info->status = g_strdup("completed");
+
+ info->has_ram = true;
+ info->ram = g_malloc0(sizeof(*info->ram));
+ info->ram->transferred = ram_bytes_transferred();
+ info->ram->remaining = 0;
+ info->ram->total = ram_bytes_total();
+ info->ram->total_time = s->total_time;
break;
case MIG_STATE_ERROR:
info->has_status = true;
@@ -260,6 +269,7 @@
} else {
migrate_fd_completed(s);
}
+ s->total_time = qemu_get_clock_ms(rt_clock) - s->total_time;
if (s->state != MIG_STATE_COMPLETED) {
if (old_vm_running) {
vm_start();
@@ -352,7 +362,7 @@
migrate_fd_close);
DPRINTF("beginning savevm\n");
- ret = qemu_savevm_state_begin(s->file, s->blk, s->shared);
+ ret = qemu_savevm_state_begin(s->file, &s->params);
if (ret < 0) {
DPRINTF("failed, %d\n", ret);
migrate_fd_error(s);
@@ -361,18 +371,18 @@
migrate_fd_put_ready(s);
}
-static MigrationState *migrate_init(int blk, int inc)
+static MigrationState *migrate_init(const MigrationParams *params)
{
MigrationState *s = migrate_get_current();
int64_t bandwidth_limit = s->bandwidth_limit;
memset(s, 0, sizeof(*s));
s->bandwidth_limit = bandwidth_limit;
- s->blk = blk;
- s->shared = inc;
+ s->params = *params;
s->bandwidth_limit = bandwidth_limit;
s->state = MIG_STATE_SETUP;
+ s->total_time = qemu_get_clock_ms(rt_clock);
return s;
}
@@ -394,9 +404,13 @@
Error **errp)
{
MigrationState *s = migrate_get_current();
+ MigrationParams params;
const char *p;
int ret;
+ params.blk = blk;
+ params.shared = inc;
+
if (s->state == MIG_STATE_ACTIVE) {
error_set(errp, QERR_MIGRATION_ACTIVE);
return;
@@ -411,7 +425,7 @@
return;
}
- s = migrate_init(blk, inc);
+ s = migrate_init(¶ms);
if (strstart(uri, "tcp:", &p)) {
ret = tcp_start_outgoing_migration(s, p, errp);
diff --git a/migration.h b/migration.h
index 2e9ca2e..de13004 100644
--- a/migration.h
+++ b/migration.h
@@ -19,6 +19,11 @@
#include "notify.h"
#include "error.h"
+struct MigrationParams {
+ bool blk;
+ bool shared;
+};
+
typedef struct MigrationState MigrationState;
struct MigrationState
@@ -31,8 +36,8 @@
int (*close)(MigrationState *s);
int (*write)(MigrationState *s, const void *buff, size_t size);
void *opaque;
- int blk;
- int shared;
+ MigrationParams params;
+ int64_t total_time;
};
void process_incoming_migration(QEMUFile *f);
diff --git a/qapi-schema.json b/qapi-schema.json
index 3b6e346..1ab5dbd 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -260,10 +260,15 @@
#
# @total: total amount of bytes involved in the migration process
#
+# @total_time: tota0l amount of ms since migration started. If
+# migration has ended, it returns the total migration
+# time. (since 1.2)
+#
# Since: 0.14.0.
##
{ 'type': 'MigrationStats',
- 'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' } }
+ 'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' ,
+ 'total_time': 'int' } }
##
# @MigrationInfo
@@ -275,8 +280,9 @@
# 'cancelled'. If this field is not returned, no migration process
# has been initiated
#
-# @ram: #optional @MigrationStats containing detailed migration status,
-# only returned if status is 'active'
+# @ram: #optional @MigrationStats containing detailed migration
+# status, only returned if status is 'active' or
+# 'completed'. 'comppleted' (since 1.2)
#
# @disk: #optional @MigrationStats containing detailed disk migration
# status, only returned if status is 'active' and it is a block
diff --git a/qemu-common.h b/qemu-common.h
index 9d9e603..c8c6b2a 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -17,6 +17,7 @@
struct Monitor;
typedef struct Monitor Monitor;
+typedef struct MigrationParams MigrationParams;
/* we put basic includes here to avoid repeating them in device drivers */
#include <stdlib.h>
diff --git a/savevm.c b/savevm.c
index faa8145..a15c163 100644
--- a/savevm.c
+++ b/savevm.c
@@ -85,6 +85,7 @@
#include "cpus.h"
#include "memory.h"
#include "qmp-commands.h"
+#include "trace.h"
#define SELF_ANNOUNCE_ROUNDS 5
@@ -1561,7 +1562,8 @@
return false;
}
-int qemu_savevm_state_begin(QEMUFile *f, int blk_enable, int shared)
+int qemu_savevm_state_begin(QEMUFile *f,
+ const MigrationParams *params)
{
SaveStateEntry *se;
int ret;
@@ -1569,8 +1571,8 @@
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
if(se->set_params == NULL) {
continue;
- }
- se->set_params(blk_enable, shared, se->opaque);
+ }
+ se->set_params(params, se->opaque);
}
qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
@@ -1624,11 +1626,17 @@
if (se->save_live_state == NULL)
continue;
+ if (qemu_file_rate_limit(f)) {
+ return 0;
+ }
+ trace_savevm_section_start();
/* Section type */
qemu_put_byte(f, QEMU_VM_SECTION_PART);
qemu_put_be32(f, se->section_id);
ret = se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
+ trace_savevm_section_end(se->section_id);
+
if (ret <= 0) {
/* Do not proceed to the next vmstate before this one reported
completion of the current stage. This serializes the migration
@@ -1658,11 +1666,13 @@
if (se->save_live_state == NULL)
continue;
+ trace_savevm_section_start();
/* Section type */
qemu_put_byte(f, QEMU_VM_SECTION_END);
qemu_put_be32(f, se->section_id);
ret = se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
+ trace_savevm_section_end(se->section_id);
if (ret < 0) {
return ret;
}
@@ -1674,6 +1684,7 @@
if (se->save_state == NULL && se->vmsd == NULL)
continue;
+ trace_savevm_section_start();
/* Section type */
qemu_put_byte(f, QEMU_VM_SECTION_FULL);
qemu_put_be32(f, se->section_id);
@@ -1687,6 +1698,7 @@
qemu_put_be32(f, se->version_id);
vmstate_save(f, se);
+ trace_savevm_section_end(se->section_id);
}
qemu_put_byte(f, QEMU_VM_EOF);
@@ -1708,13 +1720,17 @@
static int qemu_savevm_state(QEMUFile *f)
{
int ret;
+ MigrationParams params = {
+ .blk = 0,
+ .shared = 0
+ };
if (qemu_savevm_state_blocked(NULL)) {
ret = -EINVAL;
goto out;
}
- ret = qemu_savevm_state_begin(f, 0, 0);
+ ret = qemu_savevm_state_begin(f, ¶ms);
if (ret < 0)
goto out;
diff --git a/sysemu.h b/sysemu.h
index bc2c788..6540c79 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -77,7 +77,8 @@
void qemu_announce_self(void);
bool qemu_savevm_state_blocked(Error **errp);
-int qemu_savevm_state_begin(QEMUFile *f, int blk_enable, int shared);
+int qemu_savevm_state_begin(QEMUFile *f,
+ const MigrationParams *params);
int qemu_savevm_state_iterate(QEMUFile *f);
int qemu_savevm_state_complete(QEMUFile *f);
void qemu_savevm_state_cancel(QEMUFile *f);
diff --git a/trace-events b/trace-events
index bf4fe46..1f9fc98 100644
--- a/trace-events
+++ b/trace-events
@@ -864,6 +864,11 @@
# vga.c
ppm_save(const char *filename, void *display_surface) "%s surface=%p"
+# savevm.c
+
+savevm_section_start(void) ""
+savevm_section_end(unsigned int section_id) "section_id %u"
+
# hw/qxl.c
disable qxl_interface_set_mm_time(int qid, uint32_t mm_time) "%d %d"
disable qxl_io_write_vga(int qid, const char *mode, uint32_t addr, uint32_t val) "%d %s addr=%u val=%u"
diff --git a/vmstate.h b/vmstate.h
index 82d97ae..5af45e0 100644
--- a/vmstate.h
+++ b/vmstate.h
@@ -26,7 +26,7 @@
#ifndef QEMU_VMSTATE_H
#define QEMU_VMSTATE_H 1
-typedef void SaveSetParamsHandler(int blk_enable, int shared, void * opaque);
+typedef void SaveSetParamsHandler(const MigrationParams *params, void * opaque);
typedef void SaveStateHandler(QEMUFile *f, void *opaque);
typedef int SaveLiveStateHandler(QEMUFile *f, int stage, void *opaque);
typedef int LoadStateHandler(QEMUFile *f, void *opaque, int version_id);
