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qemu/migration/migration-hmp-cmds.c
Peter Xu 8b2395970a migration: Allow user to specify available switchover bandwidth 
Migration bandwidth is a very important value to live migration.  It's
because it's one of the major factors that we'll make decision on when to
switchover to destination in a precopy process.

This value is currently estimated by QEMU during the whole live migration
process by monitoring how fast we were sending the data.  This can be the
most accurate bandwidth if in the ideal world, where we're always feeding
unlimited data to the migration channel, and then it'll be limited to the
bandwidth that is available.

However in reality it may be very different, e.g., over a 10Gbps network we
can see query-migrate showing migration bandwidth of only a few tens of
MB/s just because there are plenty of other things the migration thread
might be doing.  For example, the migration thread can be busy scanning
zero pages, or it can be fetching dirty bitmap from other external dirty
sources (like vhost or KVM).  It means we may not be pushing data as much
as possible to migration channel, so the bandwidth estimated from "how many
data we sent in the channel" can be dramatically inaccurate sometimes.

With that, the decision to switchover will be affected, by assuming that we
may not be able to switchover at all with such a low bandwidth, but in
reality we can.

The migration may not even converge at all with the downtime specified,
with that wrong estimation of bandwidth, keeping iterations forever with a
low estimation of bandwidth.

The issue is QEMU itself may not be able to avoid those uncertainties on
measuing the real "available migration bandwidth".  At least not something
I can think of so far.

One way to fix this is when the user is fully aware of the available
bandwidth, then we can allow the user to help providing an accurate value.

For example, if the user has a dedicated channel of 10Gbps for migration
for this specific VM, the user can specify this bandwidth so QEMU can
always do the calculation based on this fact, trusting the user as long as
specified.  It may not be the exact bandwidth when switching over (in which
case qemu will push migration data as fast as possible), but much better
than QEMU trying to wildly guess, especially when very wrong.

A new parameter "avail-switchover-bandwidth" is introduced just for this.
So when the user specified this parameter, instead of trusting the
estimated value from QEMU itself (based on the QEMUFile send speed), it
trusts the user more by using this value to decide when to switchover,
assuming that we'll have such bandwidth available then.

Note that specifying this value will not throttle the bandwidth for
switchover yet, so QEMU will always use the full bandwidth possible for
sending switchover data, assuming that should always be the most important
way to use the network at that time.

This can resolve issues like "unconvergence migration" which is caused by
hilarious low "migration bandwidth" detected for whatever reason.

Reported-by: Zhiyi Guo <zhguo@redhat.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231010221922.40638-1-peterx@redhat.com>
2023-10-17 09:14:32 +02:00

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/*
* HMP commands related to migration
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "block/qapi.h"
#include "migration/snapshot.h"
#include "monitor/hmp.h"
#include "monitor/monitor.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-migration.h"
#include "qapi/qapi-visit-migration.h"
#include "qapi/qmp/qdict.h"
#include "qapi/string-input-visitor.h"
#include "qapi/string-output-visitor.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "sysemu/runstate.h"
#include "ui/qemu-spice.h"
#include "sysemu/sysemu.h"
#include "migration.h"
static void migration_global_dump(Monitor *mon)
{
MigrationState *ms = migrate_get_current();
monitor_printf(mon, "globals:\n");
monitor_printf(mon, "store-global-state: %s\n",
ms->store_global_state ? "on" : "off");
monitor_printf(mon, "only-migratable: %s\n",
only_migratable ? "on" : "off");
monitor_printf(mon, "send-configuration: %s\n",
ms->send_configuration ? "on" : "off");
monitor_printf(mon, "send-section-footer: %s\n",
ms->send_section_footer ? "on" : "off");
monitor_printf(mon, "decompress-error-check: %s\n",
ms->decompress_error_check ? "on" : "off");
monitor_printf(mon, "clear-bitmap-shift: %u\n",
ms->clear_bitmap_shift);
}
void hmp_info_migrate(Monitor *mon, const QDict *qdict)
{
MigrationInfo *info;
info = qmp_query_migrate(NULL);
migration_global_dump(mon);
if (info->blocked_reasons) {
strList *reasons = info->blocked_reasons;
monitor_printf(mon, "Outgoing migration blocked:\n");
while (reasons) {
monitor_printf(mon, " %s\n", reasons->value);
reasons = reasons->next;
}
}
if (info->has_status) {
monitor_printf(mon, "Migration status: %s",
MigrationStatus_str(info->status));
if (info->status == MIGRATION_STATUS_FAILED && info->error_desc) {
monitor_printf(mon, " (%s)\n", info->error_desc);
} else {
monitor_printf(mon, "\n");
}
monitor_printf(mon, "total time: %" PRIu64 " ms\n",
info->total_time);
if (info->has_expected_downtime) {
monitor_printf(mon, "expected downtime: %" PRIu64 " ms\n",
info->expected_downtime);
}
if (info->has_downtime) {
monitor_printf(mon, "downtime: %" PRIu64 " ms\n",
info->downtime);
}
if (info->has_setup_time) {
monitor_printf(mon, "setup: %" PRIu64 " ms\n",
info->setup_time);
}
}
if (info->ram) {
monitor_printf(mon, "transferred ram: %" PRIu64 " kbytes\n",
info->ram->transferred >> 10);
monitor_printf(mon, "throughput: %0.2f mbps\n",
info->ram->mbps);
monitor_printf(mon, "remaining ram: %" PRIu64 " kbytes\n",
info->ram->remaining >> 10);
monitor_printf(mon, "total ram: %" PRIu64 " kbytes\n",
info->ram->total >> 10);
monitor_printf(mon, "duplicate: %" PRIu64 " pages\n",
info->ram->duplicate);
monitor_printf(mon, "skipped: %" PRIu64 " pages\n",
info->ram->skipped);
monitor_printf(mon, "normal: %" PRIu64 " pages\n",
info->ram->normal);
monitor_printf(mon, "normal bytes: %" PRIu64 " kbytes\n",
info->ram->normal_bytes >> 10);
monitor_printf(mon, "dirty sync count: %" PRIu64 "\n",
info->ram->dirty_sync_count);
monitor_printf(mon, "page size: %" PRIu64 " kbytes\n",
info->ram->page_size >> 10);
monitor_printf(mon, "multifd bytes: %" PRIu64 " kbytes\n",
info->ram->multifd_bytes >> 10);
monitor_printf(mon, "pages-per-second: %" PRIu64 "\n",
info->ram->pages_per_second);
if (info->ram->dirty_pages_rate) {
monitor_printf(mon, "dirty pages rate: %" PRIu64 " pages\n",
info->ram->dirty_pages_rate);
}
if (info->ram->postcopy_requests) {
monitor_printf(mon, "postcopy request count: %" PRIu64 "\n",
info->ram->postcopy_requests);
}
if (info->ram->precopy_bytes) {
monitor_printf(mon, "precopy ram: %" PRIu64 " kbytes\n",
info->ram->precopy_bytes >> 10);
}
if (info->ram->downtime_bytes) {
monitor_printf(mon, "downtime ram: %" PRIu64 " kbytes\n",
info->ram->downtime_bytes >> 10);
}
if (info->ram->postcopy_bytes) {
monitor_printf(mon, "postcopy ram: %" PRIu64 " kbytes\n",
info->ram->postcopy_bytes >> 10);
}
if (info->ram->dirty_sync_missed_zero_copy) {
monitor_printf(mon,
"Zero-copy-send fallbacks happened: %" PRIu64 " times\n",
info->ram->dirty_sync_missed_zero_copy);
}
}
if (info->disk) {
monitor_printf(mon, "transferred disk: %" PRIu64 " kbytes\n",
info->disk->transferred >> 10);
monitor_printf(mon, "remaining disk: %" PRIu64 " kbytes\n",
info->disk->remaining >> 10);
monitor_printf(mon, "total disk: %" PRIu64 " kbytes\n",
info->disk->total >> 10);
}
if (info->xbzrle_cache) {
monitor_printf(mon, "cache size: %" PRIu64 " bytes\n",
info->xbzrle_cache->cache_size);
monitor_printf(mon, "xbzrle transferred: %" PRIu64 " kbytes\n",
info->xbzrle_cache->bytes >> 10);
monitor_printf(mon, "xbzrle pages: %" PRIu64 " pages\n",
info->xbzrle_cache->pages);
monitor_printf(mon, "xbzrle cache miss: %" PRIu64 " pages\n",
info->xbzrle_cache->cache_miss);
monitor_printf(mon, "xbzrle cache miss rate: %0.2f\n",
info->xbzrle_cache->cache_miss_rate);
monitor_printf(mon, "xbzrle encoding rate: %0.2f\n",
info->xbzrle_cache->encoding_rate);
monitor_printf(mon, "xbzrle overflow: %" PRIu64 "\n",
info->xbzrle_cache->overflow);
}
if (info->compression) {
monitor_printf(mon, "compression pages: %" PRIu64 " pages\n",
info->compression->pages);
monitor_printf(mon, "compression busy: %" PRIu64 "\n",
info->compression->busy);
monitor_printf(mon, "compression busy rate: %0.2f\n",
info->compression->busy_rate);
monitor_printf(mon, "compressed size: %" PRIu64 " kbytes\n",
info->compression->compressed_size >> 10);
monitor_printf(mon, "compression rate: %0.2f\n",
info->compression->compression_rate);
}
if (info->has_cpu_throttle_percentage) {
monitor_printf(mon, "cpu throttle percentage: %" PRIu64 "\n",
info->cpu_throttle_percentage);
}
if (info->has_dirty_limit_throttle_time_per_round) {
monitor_printf(mon, "dirty-limit throttle time: %" PRIu64 " us\n",
info->dirty_limit_throttle_time_per_round);
}
if (info->has_dirty_limit_ring_full_time) {
monitor_printf(mon, "dirty-limit ring full time: %" PRIu64 " us\n",
info->dirty_limit_ring_full_time);
}
if (info->has_postcopy_blocktime) {
monitor_printf(mon, "postcopy blocktime: %u\n",
info->postcopy_blocktime);
}
if (info->has_postcopy_vcpu_blocktime) {
Visitor *v;
char *str;
v = string_output_visitor_new(false, &str);
visit_type_uint32List(v, NULL, &info->postcopy_vcpu_blocktime,
&error_abort);
visit_complete(v, &str);
monitor_printf(mon, "postcopy vcpu blocktime: %s\n", str);
g_free(str);
visit_free(v);
}
if (info->has_socket_address) {
SocketAddressList *addr;
monitor_printf(mon, "socket address: [\n");
for (addr = info->socket_address; addr; addr = addr->next) {
char *s = socket_uri(addr->value);
monitor_printf(mon, "\t%s\n", s);
g_free(s);
}
monitor_printf(mon, "]\n");
}
if (info->vfio) {
monitor_printf(mon, "vfio device transferred: %" PRIu64 " kbytes\n",
info->vfio->transferred >> 10);
}
qapi_free_MigrationInfo(info);
}
void hmp_info_migrate_capabilities(Monitor *mon, const QDict *qdict)
{
MigrationCapabilityStatusList *caps, *cap;
caps = qmp_query_migrate_capabilities(NULL);
if (caps) {
for (cap = caps; cap; cap = cap->next) {
monitor_printf(mon, "%s: %s\n",
MigrationCapability_str(cap->value->capability),
cap->value->state ? "on" : "off");
}
}
qapi_free_MigrationCapabilityStatusList(caps);
}
void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
{
MigrationParameters *params;
params = qmp_query_migrate_parameters(NULL);
if (params) {
monitor_printf(mon, "%s: %" PRIu64 " ms\n",
MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_INITIAL),
params->announce_initial);
monitor_printf(mon, "%s: %" PRIu64 " ms\n",
MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_MAX),
params->announce_max);
monitor_printf(mon, "%s: %" PRIu64 "\n",
MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_ROUNDS),
params->announce_rounds);
monitor_printf(mon, "%s: %" PRIu64 " ms\n",
MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_STEP),
params->announce_step);
assert(params->has_compress_level);
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_COMPRESS_LEVEL),
params->compress_level);
assert(params->has_compress_threads);
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_COMPRESS_THREADS),
params->compress_threads);
assert(params->has_compress_wait_thread);
monitor_printf(mon, "%s: %s\n",
MigrationParameter_str(MIGRATION_PARAMETER_COMPRESS_WAIT_THREAD),
params->compress_wait_thread ? "on" : "off");
assert(params->has_decompress_threads);
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_DECOMPRESS_THREADS),
params->decompress_threads);
assert(params->has_throttle_trigger_threshold);
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_THROTTLE_TRIGGER_THRESHOLD),
params->throttle_trigger_threshold);
assert(params->has_cpu_throttle_initial);
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL),
params->cpu_throttle_initial);
assert(params->has_cpu_throttle_increment);
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT),
params->cpu_throttle_increment);
assert(params->has_cpu_throttle_tailslow);
monitor_printf(mon, "%s: %s\n",
MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_TAILSLOW),
params->cpu_throttle_tailslow ? "on" : "off");
assert(params->has_max_cpu_throttle);
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_MAX_CPU_THROTTLE),
params->max_cpu_throttle);
assert(params->tls_creds);
monitor_printf(mon, "%s: '%s'\n",
MigrationParameter_str(MIGRATION_PARAMETER_TLS_CREDS),
params->tls_creds);
assert(params->tls_hostname);
monitor_printf(mon, "%s: '%s'\n",
MigrationParameter_str(MIGRATION_PARAMETER_TLS_HOSTNAME),
params->tls_hostname);
assert(params->has_max_bandwidth);
monitor_printf(mon, "%s: %" PRIu64 " bytes/second\n",
MigrationParameter_str(MIGRATION_PARAMETER_MAX_BANDWIDTH),
params->max_bandwidth);
assert(params->has_avail_switchover_bandwidth);
monitor_printf(mon, "%s: %" PRIu64 " bytes/second\n",
MigrationParameter_str(MIGRATION_PARAMETER_AVAIL_SWITCHOVER_BANDWIDTH),
params->avail_switchover_bandwidth);
assert(params->has_downtime_limit);
monitor_printf(mon, "%s: %" PRIu64 " ms\n",
MigrationParameter_str(MIGRATION_PARAMETER_DOWNTIME_LIMIT),
params->downtime_limit);
assert(params->has_x_checkpoint_delay);
monitor_printf(mon, "%s: %u ms\n",
MigrationParameter_str(MIGRATION_PARAMETER_X_CHECKPOINT_DELAY),
params->x_checkpoint_delay);
assert(params->has_block_incremental);
monitor_printf(mon, "%s: %s\n",
MigrationParameter_str(MIGRATION_PARAMETER_BLOCK_INCREMENTAL),
params->block_incremental ? "on" : "off");
monitor_printf(mon, "%s: %u\n",
MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_CHANNELS),
params->multifd_channels);
monitor_printf(mon, "%s: %s\n",
MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_COMPRESSION),
MultiFDCompression_str(params->multifd_compression));
monitor_printf(mon, "%s: %" PRIu64 " bytes\n",
MigrationParameter_str(MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE),
params->xbzrle_cache_size);
monitor_printf(mon, "%s: %" PRIu64 "\n",
MigrationParameter_str(MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH),
params->max_postcopy_bandwidth);
monitor_printf(mon, "%s: '%s'\n",
MigrationParameter_str(MIGRATION_PARAMETER_TLS_AUTHZ),
params->tls_authz);
if (params->has_block_bitmap_mapping) {
const BitmapMigrationNodeAliasList *bmnal;
monitor_printf(mon, "%s:\n",
MigrationParameter_str(
MIGRATION_PARAMETER_BLOCK_BITMAP_MAPPING));
for (bmnal = params->block_bitmap_mapping;
bmnal;
bmnal = bmnal->next)
{
const BitmapMigrationNodeAlias *bmna = bmnal->value;
const BitmapMigrationBitmapAliasList *bmbal;
monitor_printf(mon, " '%s' -> '%s'\n",
bmna->node_name, bmna->alias);
for (bmbal = bmna->bitmaps; bmbal; bmbal = bmbal->next) {
const BitmapMigrationBitmapAlias *bmba = bmbal->value;
monitor_printf(mon, " '%s' -> '%s'\n",
bmba->name, bmba->alias);
}
}
}
monitor_printf(mon, "%s: %" PRIu64 " ms\n",
MigrationParameter_str(MIGRATION_PARAMETER_X_VCPU_DIRTY_LIMIT_PERIOD),
params->x_vcpu_dirty_limit_period);
monitor_printf(mon, "%s: %" PRIu64 " MB/s\n",
MigrationParameter_str(MIGRATION_PARAMETER_VCPU_DIRTY_LIMIT),
params->vcpu_dirty_limit);
}
qapi_free_MigrationParameters(params);
}
void hmp_loadvm(Monitor *mon, const QDict *qdict)
{
int saved_vm_running = runstate_is_running();
const char *name = qdict_get_str(qdict, "name");
Error *err = NULL;
vm_stop(RUN_STATE_RESTORE_VM);
if (load_snapshot(name, NULL, false, NULL, &err) && saved_vm_running) {
vm_start();
}
hmp_handle_error(mon, err);
}
void hmp_savevm(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
save_snapshot(qdict_get_try_str(qdict, "name"),
true, NULL, false, NULL, &err);
hmp_handle_error(mon, err);
}
void hmp_delvm(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
const char *name = qdict_get_str(qdict, "name");
delete_snapshot(name, false, NULL, &err);
hmp_handle_error(mon, err);
}
void hmp_migrate_cancel(Monitor *mon, const QDict *qdict)
{
qmp_migrate_cancel(NULL);
}
void hmp_migrate_continue(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
const char *state = qdict_get_str(qdict, "state");
int val = qapi_enum_parse(&MigrationStatus_lookup, state, -1, &err);
if (val >= 0) {
qmp_migrate_continue(val, &err);
}
hmp_handle_error(mon, err);
}
void hmp_migrate_incoming(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
const char *uri = qdict_get_str(qdict, "uri");
qmp_migrate_incoming(uri, &err);
hmp_handle_error(mon, err);
}
void hmp_migrate_recover(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
const char *uri = qdict_get_str(qdict, "uri");
qmp_migrate_recover(uri, &err);
hmp_handle_error(mon, err);
}
void hmp_migrate_pause(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
qmp_migrate_pause(&err);
hmp_handle_error(mon, err);
}
void hmp_migrate_set_capability(Monitor *mon, const QDict *qdict)
{
const char *cap = qdict_get_str(qdict, "capability");
bool state = qdict_get_bool(qdict, "state");
Error *err = NULL;
MigrationCapabilityStatusList *caps = NULL;
MigrationCapabilityStatus *value;
int val;
val = qapi_enum_parse(&MigrationCapability_lookup, cap, -1, &err);
if (val < 0) {
goto end;
}
value = g_malloc0(sizeof(*value));
value->capability = val;
value->state = state;
QAPI_LIST_PREPEND(caps, value);
qmp_migrate_set_capabilities(caps, &err);
qapi_free_MigrationCapabilityStatusList(caps);
end:
hmp_handle_error(mon, err);
}
void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
{
const char *param = qdict_get_str(qdict, "parameter");
const char *valuestr = qdict_get_str(qdict, "value");
Visitor *v = string_input_visitor_new(valuestr);
MigrateSetParameters *p = g_new0(MigrateSetParameters, 1);
uint64_t valuebw = 0;
uint64_t cache_size;
Error *err = NULL;
int val, ret;
val = qapi_enum_parse(&MigrationParameter_lookup, param, -1, &err);
if (val < 0) {
goto cleanup;
}
switch (val) {
case MIGRATION_PARAMETER_COMPRESS_LEVEL:
p->has_compress_level = true;
visit_type_uint8(v, param, &p->compress_level, &err);
break;
case MIGRATION_PARAMETER_COMPRESS_THREADS:
p->has_compress_threads = true;
visit_type_uint8(v, param, &p->compress_threads, &err);
break;
case MIGRATION_PARAMETER_COMPRESS_WAIT_THREAD:
p->has_compress_wait_thread = true;
visit_type_bool(v, param, &p->compress_wait_thread, &err);
break;
case MIGRATION_PARAMETER_DECOMPRESS_THREADS:
p->has_decompress_threads = true;
visit_type_uint8(v, param, &p->decompress_threads, &err);
break;
case MIGRATION_PARAMETER_THROTTLE_TRIGGER_THRESHOLD:
p->has_throttle_trigger_threshold = true;
visit_type_uint8(v, param, &p->throttle_trigger_threshold, &err);
break;
case MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL:
p->has_cpu_throttle_initial = true;
visit_type_uint8(v, param, &p->cpu_throttle_initial, &err);
break;
case MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT:
p->has_cpu_throttle_increment = true;
visit_type_uint8(v, param, &p->cpu_throttle_increment, &err);
break;
case MIGRATION_PARAMETER_CPU_THROTTLE_TAILSLOW:
p->has_cpu_throttle_tailslow = true;
visit_type_bool(v, param, &p->cpu_throttle_tailslow, &err);
break;
case MIGRATION_PARAMETER_MAX_CPU_THROTTLE:
p->has_max_cpu_throttle = true;
visit_type_uint8(v, param, &p->max_cpu_throttle, &err);
break;
case MIGRATION_PARAMETER_TLS_CREDS:
p->tls_creds = g_new0(StrOrNull, 1);
p->tls_creds->type = QTYPE_QSTRING;
visit_type_str(v, param, &p->tls_creds->u.s, &err);
break;
case MIGRATION_PARAMETER_TLS_HOSTNAME:
p->tls_hostname = g_new0(StrOrNull, 1);
p->tls_hostname->type = QTYPE_QSTRING;
visit_type_str(v, param, &p->tls_hostname->u.s, &err);
break;
case MIGRATION_PARAMETER_TLS_AUTHZ:
p->tls_authz = g_new0(StrOrNull, 1);
p->tls_authz->type = QTYPE_QSTRING;
visit_type_str(v, param, &p->tls_authz->u.s, &err);
break;
case MIGRATION_PARAMETER_MAX_BANDWIDTH:
p->has_max_bandwidth = true;
/*
* Can't use visit_type_size() here, because it
* defaults to Bytes rather than Mebibytes.
*/
ret = qemu_strtosz_MiB(valuestr, NULL, &valuebw);
if (ret < 0 || valuebw > INT64_MAX
|| (size_t)valuebw != valuebw) {
error_setg(&err, "Invalid size %s", valuestr);
break;
}
p->max_bandwidth = valuebw;
break;
case MIGRATION_PARAMETER_AVAIL_SWITCHOVER_BANDWIDTH:
p->has_avail_switchover_bandwidth = true;
ret = qemu_strtosz_MiB(valuestr, NULL, &valuebw);
if (ret < 0 || valuebw > INT64_MAX
|| (size_t)valuebw != valuebw) {
error_setg(&err, "Invalid size %s", valuestr);
break;
}
p->avail_switchover_bandwidth = valuebw;
break;
case MIGRATION_PARAMETER_DOWNTIME_LIMIT:
p->has_downtime_limit = true;
visit_type_size(v, param, &p->downtime_limit, &err);
break;
case MIGRATION_PARAMETER_X_CHECKPOINT_DELAY:
p->has_x_checkpoint_delay = true;
visit_type_uint32(v, param, &p->x_checkpoint_delay, &err);
break;
case MIGRATION_PARAMETER_BLOCK_INCREMENTAL:
p->has_block_incremental = true;
visit_type_bool(v, param, &p->block_incremental, &err);
break;
case MIGRATION_PARAMETER_MULTIFD_CHANNELS:
p->has_multifd_channels = true;
visit_type_uint8(v, param, &p->multifd_channels, &err);
break;
case MIGRATION_PARAMETER_MULTIFD_COMPRESSION:
p->has_multifd_compression = true;
visit_type_MultiFDCompression(v, param, &p->multifd_compression,
&err);
break;
case MIGRATION_PARAMETER_MULTIFD_ZLIB_LEVEL:
p->has_multifd_zlib_level = true;
visit_type_uint8(v, param, &p->multifd_zlib_level, &err);
break;
case MIGRATION_PARAMETER_MULTIFD_ZSTD_LEVEL:
p->has_multifd_zstd_level = true;
visit_type_uint8(v, param, &p->multifd_zstd_level, &err);
break;
case MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE:
p->has_xbzrle_cache_size = true;
if (!visit_type_size(v, param, &cache_size, &err)) {
break;
}
if (cache_size > INT64_MAX || (size_t)cache_size != cache_size) {
error_setg(&err, "Invalid size %s", valuestr);
break;
}
p->xbzrle_cache_size = cache_size;
break;
case MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH:
p->has_max_postcopy_bandwidth = true;
visit_type_size(v, param, &p->max_postcopy_bandwidth, &err);
break;
case MIGRATION_PARAMETER_ANNOUNCE_INITIAL:
p->has_announce_initial = true;
visit_type_size(v, param, &p->announce_initial, &err);
break;
case MIGRATION_PARAMETER_ANNOUNCE_MAX:
p->has_announce_max = true;
visit_type_size(v, param, &p->announce_max, &err);
break;
case MIGRATION_PARAMETER_ANNOUNCE_ROUNDS:
p->has_announce_rounds = true;
visit_type_size(v, param, &p->announce_rounds, &err);
break;
case MIGRATION_PARAMETER_ANNOUNCE_STEP:
p->has_announce_step = true;
visit_type_size(v, param, &p->announce_step, &err);
break;
case MIGRATION_PARAMETER_BLOCK_BITMAP_MAPPING:
error_setg(&err, "The block-bitmap-mapping parameter can only be set "
"through QMP");
break;
case MIGRATION_PARAMETER_X_VCPU_DIRTY_LIMIT_PERIOD:
p->has_x_vcpu_dirty_limit_period = true;
visit_type_size(v, param, &p->x_vcpu_dirty_limit_period, &err);
break;
case MIGRATION_PARAMETER_VCPU_DIRTY_LIMIT:
p->has_vcpu_dirty_limit = true;
visit_type_size(v, param, &p->vcpu_dirty_limit, &err);
break;
default:
assert(0);
}
if (err) {
goto cleanup;
}
qmp_migrate_set_parameters(p, &err);
cleanup:
qapi_free_MigrateSetParameters(p);
visit_free(v);
hmp_handle_error(mon, err);
}
void hmp_migrate_start_postcopy(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
qmp_migrate_start_postcopy(&err);
hmp_handle_error(mon, err);
}
#ifdef CONFIG_REPLICATION
void hmp_x_colo_lost_heartbeat(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
qmp_x_colo_lost_heartbeat(&err);
hmp_handle_error(mon, err);
}
#endif
typedef struct HMPMigrationStatus {
QEMUTimer *timer;
Monitor *mon;
bool is_block_migration;
} HMPMigrationStatus;
static void hmp_migrate_status_cb(void *opaque)
{
HMPMigrationStatus *status = opaque;
MigrationInfo *info;
info = qmp_query_migrate(NULL);
if (!info->has_status || info->status == MIGRATION_STATUS_ACTIVE ||
info->status == MIGRATION_STATUS_SETUP) {
if (info->disk) {
int progress;
if (info->disk->remaining) {
progress = info->disk->transferred * 100 / info->disk->total;
} else {
progress = 100;
}
monitor_printf(status->mon, "Completed %d %%\r", progress);
monitor_flush(status->mon);
}
timer_mod(status->timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
} else {
if (status->is_block_migration) {
monitor_printf(status->mon, "\n");
}
if (info->error_desc) {
error_report("%s", info->error_desc);
}
monitor_resume(status->mon);
timer_free(status->timer);
g_free(status);
}
qapi_free_MigrationInfo(info);
}
void hmp_migrate(Monitor *mon, const QDict *qdict)
{
bool detach = qdict_get_try_bool(qdict, "detach", false);
bool blk = qdict_get_try_bool(qdict, "blk", false);
bool inc = qdict_get_try_bool(qdict, "inc", false);
bool resume = qdict_get_try_bool(qdict, "resume", false);
const char *uri = qdict_get_str(qdict, "uri");
Error *err = NULL;
qmp_migrate(uri, !!blk, blk, !!inc, inc,
false, false, true, resume, &err);
if (hmp_handle_error(mon, err)) {
return;
}
if (!detach) {
HMPMigrationStatus *status;
if (monitor_suspend(mon) < 0) {
monitor_printf(mon, "terminal does not allow synchronous "
"migration, continuing detached\n");
return;
}
status = g_malloc0(sizeof(*status));
status->mon = mon;
status->is_block_migration = blk || inc;
status->timer = timer_new_ms(QEMU_CLOCK_REALTIME, hmp_migrate_status_cb,
status);
timer_mod(status->timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
}
}
void migrate_set_capability_completion(ReadLineState *rs, int nb_args,
const char *str)
{
size_t len;
len = strlen(str);
readline_set_completion_index(rs, len);
if (nb_args == 2) {
int i;
for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
readline_add_completion_of(rs, str, MigrationCapability_str(i));
}
} else if (nb_args == 3) {
readline_add_completion_of(rs, str, "on");
readline_add_completion_of(rs, str, "off");
}
}
void migrate_set_parameter_completion(ReadLineState *rs, int nb_args,
const char *str)
{
size_t len;
len = strlen(str);
readline_set_completion_index(rs, len);
if (nb_args == 2) {
int i;
for (i = 0; i < MIGRATION_PARAMETER__MAX; i++) {
readline_add_completion_of(rs, str, MigrationParameter_str(i));
}
}
}
static void vm_completion(ReadLineState *rs, const char *str)
{
size_t len;
BlockDriverState *bs;
BdrvNextIterator it;
GRAPH_RDLOCK_GUARD_MAINLOOP();
len = strlen(str);
readline_set_completion_index(rs, len);
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {
SnapshotInfoList *snapshots, *snapshot;
AioContext *ctx = bdrv_get_aio_context(bs);
bool ok = false;
aio_context_acquire(ctx);
if (bdrv_can_snapshot(bs)) {
ok = bdrv_query_snapshot_info_list(bs, &snapshots, NULL) == 0;
}
aio_context_release(ctx);
if (!ok) {
continue;
}
snapshot = snapshots;
while (snapshot) {
readline_add_completion_of(rs, str, snapshot->value->name);
readline_add_completion_of(rs, str, snapshot->value->id);
snapshot = snapshot->next;
}
qapi_free_SnapshotInfoList(snapshots);
}
}
void delvm_completion(ReadLineState *rs, int nb_args, const char *str)
{
if (nb_args == 2) {
vm_completion(rs, str);
}
}
void loadvm_completion(ReadLineState *rs, int nb_args, const char *str)
{
if (nb_args == 2) {
vm_completion(rs, str);
}
}
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