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qemu/migration/options.c
Wei Wang 82137e6c8c migration: enforce multifd and postcopy preempt to be set before incoming 
qemu_start_incoming_migration needs to check the number of multifd
channels or postcopy ram channels to configure the backlog parameter (i.e.
the maximum length to which the queue of pending connections for sockfd
may grow) of listen(). So enforce the usage of postcopy-preempt and
multifd as below:
- need to use "-incoming defer" on the destination; and
- set_capability and set_parameter need to be done before migrate_incoming

Otherwise, disable the use of the features and report error messages to
remind users to adjust the commands.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230606101910.20456-2-wei.w.wang@intel.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Acked-by: Juan Quintela <quintela@redhat.com>
2023-07-26 10:55:56 +02:00

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/*
* QEMU migration capabilities
*
* Copyright (c) 2012-2023 Red Hat Inc
*
* Authors:
* Orit Wasserman <owasserm@redhat.com>
* Juan Quintela <quintela@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "exec/target_page.h"
#include "qapi/clone-visitor.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-migration.h"
#include "qapi/qapi-visit-migration.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qmp/qnull.h"
#include "sysemu/runstate.h"
#include "migration/colo.h"
#include "migration/misc.h"
#include "migration.h"
#include "migration-stats.h"
#include "qemu-file.h"
#include "ram.h"
#include "options.h"
#include "sysemu/kvm.h"
/* Maximum migrate downtime set to 2000 seconds */
#define MAX_MIGRATE_DOWNTIME_SECONDS 2000
#define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
#define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */
/* Time in milliseconds we are allowed to stop the source,
* for sending the last part */
#define DEFAULT_MIGRATE_SET_DOWNTIME 300
/* Default compression thread count */
#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
/* Default decompression thread count, usually decompression is at
* least 4 times as fast as compression.*/
#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
/* Define default autoconverge cpu throttle migration parameters */
#define DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD 50
#define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
#define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
#define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99
/* Migration XBZRLE default cache size */
#define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
/* The delay time (in ms) between two COLO checkpoints */
#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
#define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
#define DEFAULT_MIGRATE_MULTIFD_COMPRESSION MULTIFD_COMPRESSION_NONE
/* 0: means nocompress, 1: best speed, ... 9: best compress ratio */
#define DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL 1
/* 0: means nocompress, 1: best speed, ... 20: best compress ratio */
#define DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL 1
/* Background transfer rate for postcopy, 0 means unlimited, note
* that page requests can still exceed this limit.
*/
#define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0
/*
* Parameters for self_announce_delay giving a stream of RARP/ARP
* packets after migration.
*/
#define DEFAULT_MIGRATE_ANNOUNCE_INITIAL 50
#define DEFAULT_MIGRATE_ANNOUNCE_MAX 550
#define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5
#define DEFAULT_MIGRATE_ANNOUNCE_STEP 100
#define DEFINE_PROP_MIG_CAP(name, x) \
DEFINE_PROP_BOOL(name, MigrationState, capabilities[x], false)
#define DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD 1000 /* milliseconds */
#define DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT 1 /* MB/s */
Property migration_properties[] = {
DEFINE_PROP_BOOL("store-global-state", MigrationState,
store_global_state, true),
DEFINE_PROP_BOOL("send-configuration", MigrationState,
send_configuration, true),
DEFINE_PROP_BOOL("send-section-footer", MigrationState,
send_section_footer, true),
DEFINE_PROP_BOOL("decompress-error-check", MigrationState,
decompress_error_check, true),
DEFINE_PROP_BOOL("multifd-flush-after-each-section", MigrationState,
multifd_flush_after_each_section, false),
DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState,
clear_bitmap_shift, CLEAR_BITMAP_SHIFT_DEFAULT),
DEFINE_PROP_BOOL("x-preempt-pre-7-2", MigrationState,
preempt_pre_7_2, false),
/* Migration parameters */
DEFINE_PROP_UINT8("x-compress-level", MigrationState,
parameters.compress_level,
DEFAULT_MIGRATE_COMPRESS_LEVEL),
DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
parameters.compress_threads,
DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState,
parameters.compress_wait_thread, true),
DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
parameters.decompress_threads,
DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
DEFINE_PROP_UINT8("x-throttle-trigger-threshold", MigrationState,
parameters.throttle_trigger_threshold,
DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD),
DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
parameters.cpu_throttle_initial,
DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
parameters.cpu_throttle_increment,
DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
DEFINE_PROP_BOOL("x-cpu-throttle-tailslow", MigrationState,
parameters.cpu_throttle_tailslow, false),
DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
parameters.max_bandwidth, MAX_THROTTLE),
DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
parameters.downtime_limit,
DEFAULT_MIGRATE_SET_DOWNTIME),
DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
parameters.x_checkpoint_delay,
DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
DEFINE_PROP_UINT8("multifd-channels", MigrationState,
parameters.multifd_channels,
DEFAULT_MIGRATE_MULTIFD_CHANNELS),
DEFINE_PROP_MULTIFD_COMPRESSION("multifd-compression", MigrationState,
parameters.multifd_compression,
DEFAULT_MIGRATE_MULTIFD_COMPRESSION),
DEFINE_PROP_UINT8("multifd-zlib-level", MigrationState,
parameters.multifd_zlib_level,
DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL),
DEFINE_PROP_UINT8("multifd-zstd-level", MigrationState,
parameters.multifd_zstd_level,
DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL),
DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
parameters.xbzrle_cache_size,
DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState,
parameters.max_postcopy_bandwidth,
DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH),
DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState,
parameters.max_cpu_throttle,
DEFAULT_MIGRATE_MAX_CPU_THROTTLE),
DEFINE_PROP_SIZE("announce-initial", MigrationState,
parameters.announce_initial,
DEFAULT_MIGRATE_ANNOUNCE_INITIAL),
DEFINE_PROP_SIZE("announce-max", MigrationState,
parameters.announce_max,
DEFAULT_MIGRATE_ANNOUNCE_MAX),
DEFINE_PROP_SIZE("announce-rounds", MigrationState,
parameters.announce_rounds,
DEFAULT_MIGRATE_ANNOUNCE_ROUNDS),
DEFINE_PROP_SIZE("announce-step", MigrationState,
parameters.announce_step,
DEFAULT_MIGRATE_ANNOUNCE_STEP),
DEFINE_PROP_STRING("tls-creds", MigrationState, parameters.tls_creds),
DEFINE_PROP_STRING("tls-hostname", MigrationState, parameters.tls_hostname),
DEFINE_PROP_STRING("tls-authz", MigrationState, parameters.tls_authz),
DEFINE_PROP_UINT64("x-vcpu-dirty-limit-period", MigrationState,
parameters.x_vcpu_dirty_limit_period,
DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD),
DEFINE_PROP_UINT64("vcpu-dirty-limit", MigrationState,
parameters.vcpu_dirty_limit,
DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT),
/* Migration capabilities */
DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
DEFINE_PROP_MIG_CAP("x-postcopy-preempt",
MIGRATION_CAPABILITY_POSTCOPY_PREEMPT),
DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD),
DEFINE_PROP_MIG_CAP("x-background-snapshot",
MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT),
#ifdef CONFIG_LINUX
DEFINE_PROP_MIG_CAP("x-zero-copy-send",
MIGRATION_CAPABILITY_ZERO_COPY_SEND),
#endif
DEFINE_PROP_MIG_CAP("x-switchover-ack",
MIGRATION_CAPABILITY_SWITCHOVER_ACK),
DEFINE_PROP_MIG_CAP("x-dirty-limit", MIGRATION_CAPABILITY_DIRTY_LIMIT),
DEFINE_PROP_END_OF_LIST(),
};
bool migrate_auto_converge(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
}
bool migrate_background_snapshot(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT];
}
bool migrate_block(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_BLOCK];
}
bool migrate_colo(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_X_COLO];
}
bool migrate_compress(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_COMPRESS];
}
bool migrate_dirty_bitmaps(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
}
bool migrate_dirty_limit(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_DIRTY_LIMIT];
}
bool migrate_events(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_EVENTS];
}
bool migrate_ignore_shared(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
}
bool migrate_late_block_activate(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE];
}
bool migrate_multifd(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_MULTIFD];
}
bool migrate_pause_before_switchover(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
}
bool migrate_postcopy_blocktime(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
}
bool migrate_postcopy_preempt(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT];
}
bool migrate_postcopy_ram(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
}
bool migrate_rdma_pin_all(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL];
}
bool migrate_release_ram(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
}
bool migrate_return_path(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
}
bool migrate_switchover_ack(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_SWITCHOVER_ACK];
}
bool migrate_validate_uuid(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_VALIDATE_UUID];
}
bool migrate_xbzrle(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_XBZRLE];
}
bool migrate_zero_blocks(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
}
bool migrate_zero_copy_send(void)
{
MigrationState *s = migrate_get_current();
return s->capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND];
}
/* pseudo capabilities */
bool migrate_multifd_flush_after_each_section(void)
{
MigrationState *s = migrate_get_current();
return s->multifd_flush_after_each_section;
}
bool migrate_postcopy(void)
{
return migrate_postcopy_ram() || migrate_dirty_bitmaps();
}
bool migrate_tls(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.tls_creds && *s->parameters.tls_creds;
}
typedef enum WriteTrackingSupport {
WT_SUPPORT_UNKNOWN = 0,
WT_SUPPORT_ABSENT,
WT_SUPPORT_AVAILABLE,
WT_SUPPORT_COMPATIBLE
} WriteTrackingSupport;
static
WriteTrackingSupport migrate_query_write_tracking(void)
{
/* Check if kernel supports required UFFD features */
if (!ram_write_tracking_available()) {
return WT_SUPPORT_ABSENT;
}
/*
* Check if current memory configuration is
* compatible with required UFFD features.
*/
if (!ram_write_tracking_compatible()) {
return WT_SUPPORT_AVAILABLE;
}
return WT_SUPPORT_COMPATIBLE;
}
/* Migration capabilities set */
struct MigrateCapsSet {
int size; /* Capability set size */
MigrationCapability caps[]; /* Variadic array of capabilities */
};
typedef struct MigrateCapsSet MigrateCapsSet;
/* Define and initialize MigrateCapsSet */
#define INITIALIZE_MIGRATE_CAPS_SET(_name, ...) \
MigrateCapsSet _name = { \
.size = sizeof((int []) { __VA_ARGS__ }) / sizeof(int), \
.caps = { __VA_ARGS__ } \
}
/* Background-snapshot compatibility check list */
static const
INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot,
MIGRATION_CAPABILITY_POSTCOPY_RAM,
MIGRATION_CAPABILITY_DIRTY_BITMAPS,
MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME,
MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE,
MIGRATION_CAPABILITY_RETURN_PATH,
MIGRATION_CAPABILITY_MULTIFD,
MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER,
MIGRATION_CAPABILITY_AUTO_CONVERGE,
MIGRATION_CAPABILITY_RELEASE_RAM,
MIGRATION_CAPABILITY_RDMA_PIN_ALL,
MIGRATION_CAPABILITY_COMPRESS,
MIGRATION_CAPABILITY_XBZRLE,
MIGRATION_CAPABILITY_X_COLO,
MIGRATION_CAPABILITY_VALIDATE_UUID,
MIGRATION_CAPABILITY_ZERO_COPY_SEND);
static bool migrate_incoming_started(void)
{
return !!migration_incoming_get_current()->transport_data;
}
/**
* @migration_caps_check - check capability compatibility
*
* @old_caps: old capability list
* @new_caps: new capability list
* @errp: set *errp if the check failed, with reason
*
* Returns true if check passed, otherwise false.
*/
bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
{
MigrationIncomingState *mis = migration_incoming_get_current();
ERRP_GUARD();
#ifndef CONFIG_LIVE_BLOCK_MIGRATION
if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
"block migration");
error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
return false;
}
#endif
#ifndef CONFIG_REPLICATION
if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
error_setg(errp, "QEMU compiled without replication module"
" can't enable COLO");
error_append_hint(errp, "Please enable replication before COLO.\n");
return false;
}
#endif
if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
/* This check is reasonably expensive, so only when it's being
* set the first time, also it's only the destination that needs
* special support.
*/
if (!old_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM] &&
runstate_check(RUN_STATE_INMIGRATE) &&
!postcopy_ram_supported_by_host(mis, errp)) {
error_prepend(errp, "Postcopy is not supported: ");
return false;
}
if (new_caps[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
error_setg(errp, "Postcopy is not compatible with ignore-shared");
return false;
}
if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
error_setg(errp, "Postcopy is not yet compatible with multifd");
return false;
}
}
if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
WriteTrackingSupport wt_support;
int idx;
/*
* Check if 'background-snapshot' capability is supported by
* host kernel and compatible with guest memory configuration.
*/
wt_support = migrate_query_write_tracking();
if (wt_support < WT_SUPPORT_AVAILABLE) {
error_setg(errp, "Background-snapshot is not supported by host kernel");
return false;
}
if (wt_support < WT_SUPPORT_COMPATIBLE) {
error_setg(errp, "Background-snapshot is not compatible "
"with guest memory configuration");
return false;
}
/*
* Check if there are any migration capabilities
* incompatible with 'background-snapshot'.
*/
for (idx = 0; idx < check_caps_background_snapshot.size; idx++) {
int incomp_cap = check_caps_background_snapshot.caps[idx];
if (new_caps[incomp_cap]) {
error_setg(errp,
"Background-snapshot is not compatible with %s",
MigrationCapability_str(incomp_cap));
return false;
}
}
}
#ifdef CONFIG_LINUX
if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
(!new_caps[MIGRATION_CAPABILITY_MULTIFD] ||
new_caps[MIGRATION_CAPABILITY_COMPRESS] ||
new_caps[MIGRATION_CAPABILITY_XBZRLE] ||
migrate_multifd_compression() ||
migrate_tls())) {
error_setg(errp,
"Zero copy only available for non-compressed non-TLS multifd migration");
return false;
}
#else
if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
error_setg(errp,
"Zero copy currently only available on Linux");
return false;
}
#endif
if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
if (!new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
error_setg(errp, "Postcopy preempt requires postcopy-ram");
return false;
}
/*
* Preempt mode requires urgent pages to be sent in separate
* channel, OTOH compression logic will disorder all pages into
* different compression channels, which is not compatible with the
* preempt assumptions on channel assignments.
*/
if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
error_setg(errp, "Postcopy preempt not compatible with compress");
return false;
}
if (migrate_incoming_started()) {
error_setg(errp,
"Postcopy preempt must be set before incoming starts");
return false;
}
}
if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
error_setg(errp, "Multifd is not compatible with compress");
return false;
}
if (migrate_incoming_started()) {
error_setg(errp, "Multifd must be set before incoming starts");
return false;
}
}
if (new_caps[MIGRATION_CAPABILITY_SWITCHOVER_ACK]) {
if (!new_caps[MIGRATION_CAPABILITY_RETURN_PATH]) {
error_setg(errp, "Capability 'switchover-ack' requires capability "
"'return-path'");
return false;
}
}
if (new_caps[MIGRATION_CAPABILITY_DIRTY_LIMIT]) {
if (new_caps[MIGRATION_CAPABILITY_AUTO_CONVERGE]) {
error_setg(errp, "dirty-limit conflicts with auto-converge"
" either of then available currently");
return false;
}
if (!kvm_enabled() || !kvm_dirty_ring_enabled()) {
error_setg(errp, "dirty-limit requires KVM with accelerator"
" property 'dirty-ring-size' set");
return false;
}
}
return true;
}
bool migrate_cap_set(int cap, bool value, Error **errp)
{
MigrationState *s = migrate_get_current();
bool new_caps[MIGRATION_CAPABILITY__MAX];
if (migration_is_running(s->state)) {
error_setg(errp, QERR_MIGRATION_ACTIVE);
return false;
}
memcpy(new_caps, s->capabilities, sizeof(new_caps));
new_caps[cap] = value;
if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
return false;
}
s->capabilities[cap] = value;
return true;
}
MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
{
MigrationCapabilityStatusList *head = NULL, **tail = &head;
MigrationCapabilityStatus *caps;
MigrationState *s = migrate_get_current();
int i;
for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
#ifndef CONFIG_LIVE_BLOCK_MIGRATION
if (i == MIGRATION_CAPABILITY_BLOCK) {
continue;
}
#endif
caps = g_malloc0(sizeof(*caps));
caps->capability = i;
caps->state = s->capabilities[i];
QAPI_LIST_APPEND(tail, caps);
}
return head;
}
void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
Error **errp)
{
MigrationState *s = migrate_get_current();
MigrationCapabilityStatusList *cap;
bool new_caps[MIGRATION_CAPABILITY__MAX];
if (migration_is_running(s->state) || migration_in_colo_state()) {
error_setg(errp, QERR_MIGRATION_ACTIVE);
return;
}
memcpy(new_caps, s->capabilities, sizeof(new_caps));
for (cap = params; cap; cap = cap->next) {
new_caps[cap->value->capability] = cap->value->state;
}
if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
return;
}
for (cap = params; cap; cap = cap->next) {
s->capabilities[cap->value->capability] = cap->value->state;
}
}
/* parameters */
const BitmapMigrationNodeAliasList *migrate_block_bitmap_mapping(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.block_bitmap_mapping;
}
bool migrate_has_block_bitmap_mapping(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.has_block_bitmap_mapping;
}
bool migrate_block_incremental(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.block_incremental;
}
uint32_t migrate_checkpoint_delay(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.x_checkpoint_delay;
}
int migrate_compress_level(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.compress_level;
}
int migrate_compress_threads(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.compress_threads;
}
int migrate_compress_wait_thread(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.compress_wait_thread;
}
uint8_t migrate_cpu_throttle_increment(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.cpu_throttle_increment;
}
uint8_t migrate_cpu_throttle_initial(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.cpu_throttle_initial;
}
bool migrate_cpu_throttle_tailslow(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.cpu_throttle_tailslow;
}
int migrate_decompress_threads(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.decompress_threads;
}
uint64_t migrate_downtime_limit(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.downtime_limit;
}
uint8_t migrate_max_cpu_throttle(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.max_cpu_throttle;
}
uint64_t migrate_max_bandwidth(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.max_bandwidth;
}
uint64_t migrate_max_postcopy_bandwidth(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.max_postcopy_bandwidth;
}
int migrate_multifd_channels(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.multifd_channels;
}
MultiFDCompression migrate_multifd_compression(void)
{
MigrationState *s = migrate_get_current();
assert(s->parameters.multifd_compression < MULTIFD_COMPRESSION__MAX);
return s->parameters.multifd_compression;
}
int migrate_multifd_zlib_level(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.multifd_zlib_level;
}
int migrate_multifd_zstd_level(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.multifd_zstd_level;
}
uint8_t migrate_throttle_trigger_threshold(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.throttle_trigger_threshold;
}
const char *migrate_tls_authz(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.tls_authz;
}
const char *migrate_tls_creds(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.tls_creds;
}
const char *migrate_tls_hostname(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.tls_hostname;
}
uint64_t migrate_xbzrle_cache_size(void)
{
MigrationState *s = migrate_get_current();
return s->parameters.xbzrle_cache_size;
}
/* parameter setters */
void migrate_set_block_incremental(bool value)
{
MigrationState *s = migrate_get_current();
s->parameters.block_incremental = value;
}
/* parameters helpers */
void block_cleanup_parameters(void)
{
MigrationState *s = migrate_get_current();
if (s->must_remove_block_options) {
/* setting to false can never fail */
migrate_cap_set(MIGRATION_CAPABILITY_BLOCK, false, &error_abort);
migrate_set_block_incremental(false);
s->must_remove_block_options = false;
}
}
AnnounceParameters *migrate_announce_params(void)
{
static AnnounceParameters ap;
MigrationState *s = migrate_get_current();
ap.initial = s->parameters.announce_initial;
ap.max = s->parameters.announce_max;
ap.rounds = s->parameters.announce_rounds;
ap.step = s->parameters.announce_step;
return &ap;
}
MigrationParameters *qmp_query_migrate_parameters(Error **errp)
{
MigrationParameters *params;
MigrationState *s = migrate_get_current();
/* TODO use QAPI_CLONE() instead of duplicating it inline */
params = g_malloc0(sizeof(*params));
params->has_compress_level = true;
params->compress_level = s->parameters.compress_level;
params->has_compress_threads = true;
params->compress_threads = s->parameters.compress_threads;
params->has_compress_wait_thread = true;
params->compress_wait_thread = s->parameters.compress_wait_thread;
params->has_decompress_threads = true;
params->decompress_threads = s->parameters.decompress_threads;
params->has_throttle_trigger_threshold = true;
params->throttle_trigger_threshold = s->parameters.throttle_trigger_threshold;
params->has_cpu_throttle_initial = true;
params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
params->has_cpu_throttle_increment = true;
params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
params->has_cpu_throttle_tailslow = true;
params->cpu_throttle_tailslow = s->parameters.cpu_throttle_tailslow;
params->tls_creds = g_strdup(s->parameters.tls_creds);
params->tls_hostname = g_strdup(s->parameters.tls_hostname);
params->tls_authz = g_strdup(s->parameters.tls_authz ?
s->parameters.tls_authz : "");
params->has_max_bandwidth = true;
params->max_bandwidth = s->parameters.max_bandwidth;
params->has_downtime_limit = true;
params->downtime_limit = s->parameters.downtime_limit;
params->has_x_checkpoint_delay = true;
params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
params->has_block_incremental = true;
params->block_incremental = s->parameters.block_incremental;
params->has_multifd_channels = true;
params->multifd_channels = s->parameters.multifd_channels;
params->has_multifd_compression = true;
params->multifd_compression = s->parameters.multifd_compression;
params->has_multifd_zlib_level = true;
params->multifd_zlib_level = s->parameters.multifd_zlib_level;
params->has_multifd_zstd_level = true;
params->multifd_zstd_level = s->parameters.multifd_zstd_level;
params->has_xbzrle_cache_size = true;
params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
params->has_max_postcopy_bandwidth = true;
params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth;
params->has_max_cpu_throttle = true;
params->max_cpu_throttle = s->parameters.max_cpu_throttle;
params->has_announce_initial = true;
params->announce_initial = s->parameters.announce_initial;
params->has_announce_max = true;
params->announce_max = s->parameters.announce_max;
params->has_announce_rounds = true;
params->announce_rounds = s->parameters.announce_rounds;
params->has_announce_step = true;
params->announce_step = s->parameters.announce_step;
if (s->parameters.has_block_bitmap_mapping) {
params->has_block_bitmap_mapping = true;
params->block_bitmap_mapping =
QAPI_CLONE(BitmapMigrationNodeAliasList,
s->parameters.block_bitmap_mapping);
}
params->has_x_vcpu_dirty_limit_period = true;
params->x_vcpu_dirty_limit_period = s->parameters.x_vcpu_dirty_limit_period;
params->has_vcpu_dirty_limit = true;
params->vcpu_dirty_limit = s->parameters.vcpu_dirty_limit;
return params;
}
void migrate_params_init(MigrationParameters *params)
{
params->tls_hostname = g_strdup("");
params->tls_creds = g_strdup("");
/* Set has_* up only for parameter checks */
params->has_compress_level = true;
params->has_compress_threads = true;
params->has_compress_wait_thread = true;
params->has_decompress_threads = true;
params->has_throttle_trigger_threshold = true;
params->has_cpu_throttle_initial = true;
params->has_cpu_throttle_increment = true;
params->has_cpu_throttle_tailslow = true;
params->has_max_bandwidth = true;
params->has_downtime_limit = true;
params->has_x_checkpoint_delay = true;
params->has_block_incremental = true;
params->has_multifd_channels = true;
params->has_multifd_compression = true;
params->has_multifd_zlib_level = true;
params->has_multifd_zstd_level = true;
params->has_xbzrle_cache_size = true;
params->has_max_postcopy_bandwidth = true;
params->has_max_cpu_throttle = true;
params->has_announce_initial = true;
params->has_announce_max = true;
params->has_announce_rounds = true;
params->has_announce_step = true;
params->has_x_vcpu_dirty_limit_period = true;
params->has_vcpu_dirty_limit = true;
}
/*
* Check whether the parameters are valid. Error will be put into errp
* (if provided). Return true if valid, otherwise false.
*/
bool migrate_params_check(MigrationParameters *params, Error **errp)
{
if (params->has_compress_level &&
(params->compress_level > 9)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
"a value between 0 and 9");
return false;
}
if (params->has_compress_threads && (params->compress_threads < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"compress_threads",
"a value between 1 and 255");
return false;
}
if (params->has_decompress_threads && (params->decompress_threads < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"decompress_threads",
"a value between 1 and 255");
return false;
}
if (params->has_throttle_trigger_threshold &&
(params->throttle_trigger_threshold < 1 ||
params->throttle_trigger_threshold > 100)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"throttle_trigger_threshold",
"an integer in the range of 1 to 100");
return false;
}
if (params->has_cpu_throttle_initial &&
(params->cpu_throttle_initial < 1 ||
params->cpu_throttle_initial > 99)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"cpu_throttle_initial",
"an integer in the range of 1 to 99");
return false;
}
if (params->has_cpu_throttle_increment &&
(params->cpu_throttle_increment < 1 ||
params->cpu_throttle_increment > 99)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"cpu_throttle_increment",
"an integer in the range of 1 to 99");
return false;
}
if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"max_bandwidth",
"an integer in the range of 0 to "stringify(SIZE_MAX)
" bytes/second");
return false;
}
if (params->has_downtime_limit &&
(params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"downtime_limit",
"an integer in the range of 0 to "
stringify(MAX_MIGRATE_DOWNTIME)" ms");
return false;
}
/* x_checkpoint_delay is now always positive */
if (params->has_multifd_channels && (params->multifd_channels < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"multifd_channels",
"a value between 1 and 255");
return false;
}
if (params->has_multifd_zlib_level &&
(params->multifd_zlib_level > 9)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zlib_level",
"a value between 0 and 9");
return false;
}
if (params->has_multifd_zstd_level &&
(params->multifd_zstd_level > 20)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zstd_level",
"a value between 0 and 20");
return false;
}
if (params->has_xbzrle_cache_size &&
(params->xbzrle_cache_size < qemu_target_page_size() ||
!is_power_of_2(params->xbzrle_cache_size))) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"xbzrle_cache_size",
"a power of two no less than the target page size");
return false;
}
if (params->has_max_cpu_throttle &&
(params->max_cpu_throttle < params->cpu_throttle_initial ||
params->max_cpu_throttle > 99)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"max_cpu_throttle",
"an integer in the range of cpu_throttle_initial to 99");
return false;
}
if (params->has_announce_initial &&
params->announce_initial > 100000) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"announce_initial",
"a value between 0 and 100000");
return false;
}
if (params->has_announce_max &&
params->announce_max > 100000) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"announce_max",
"a value between 0 and 100000");
return false;
}
if (params->has_announce_rounds &&
params->announce_rounds > 1000) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"announce_rounds",
"a value between 0 and 1000");
return false;
}
if (params->has_announce_step &&
(params->announce_step < 1 ||
params->announce_step > 10000)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"announce_step",
"a value between 0 and 10000");
return false;
}
if (params->has_block_bitmap_mapping &&
!check_dirty_bitmap_mig_alias_map(params->block_bitmap_mapping, errp)) {
error_prepend(errp, "Invalid mapping given for block-bitmap-mapping: ");
return false;
}
#ifdef CONFIG_LINUX
if (migrate_zero_copy_send() &&
((params->has_multifd_compression && params->multifd_compression) ||
(params->tls_creds && *params->tls_creds))) {
error_setg(errp,
"Zero copy only available for non-compressed non-TLS multifd migration");
return false;
}
#endif
if (params->has_x_vcpu_dirty_limit_period &&
(params->x_vcpu_dirty_limit_period < 1 ||
params->x_vcpu_dirty_limit_period > 1000)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"x-vcpu-dirty-limit-period",
"a value between 1 and 1000");
return false;
}
if (params->has_vcpu_dirty_limit &&
(params->vcpu_dirty_limit < 1)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"vcpu_dirty_limit",
"is invalid, it must greater then 1 MB/s");
return false;
}
return true;
}
static void migrate_params_test_apply(MigrateSetParameters *params,
MigrationParameters *dest)
{
*dest = migrate_get_current()->parameters;
/* TODO use QAPI_CLONE() instead of duplicating it inline */
if (params->has_compress_level) {
dest->compress_level = params->compress_level;
}
if (params->has_compress_threads) {
dest->compress_threads = params->compress_threads;
}
if (params->has_compress_wait_thread) {
dest->compress_wait_thread = params->compress_wait_thread;
}
if (params->has_decompress_threads) {
dest->decompress_threads = params->decompress_threads;
}
if (params->has_throttle_trigger_threshold) {
dest->throttle_trigger_threshold = params->throttle_trigger_threshold;
}
if (params->has_cpu_throttle_initial) {
dest->cpu_throttle_initial = params->cpu_throttle_initial;
}
if (params->has_cpu_throttle_increment) {
dest->cpu_throttle_increment = params->cpu_throttle_increment;
}
if (params->has_cpu_throttle_tailslow) {
dest->cpu_throttle_tailslow = params->cpu_throttle_tailslow;
}
if (params->tls_creds) {
assert(params->tls_creds->type == QTYPE_QSTRING);
dest->tls_creds = params->tls_creds->u.s;
}
if (params->tls_hostname) {
assert(params->tls_hostname->type == QTYPE_QSTRING);
dest->tls_hostname = params->tls_hostname->u.s;
}
if (params->has_max_bandwidth) {
dest->max_bandwidth = params->max_bandwidth;
}
if (params->has_downtime_limit) {
dest->downtime_limit = params->downtime_limit;
}
if (params->has_x_checkpoint_delay) {
dest->x_checkpoint_delay = params->x_checkpoint_delay;
}
if (params->has_block_incremental) {
dest->block_incremental = params->block_incremental;
}
if (params->has_multifd_channels) {
dest->multifd_channels = params->multifd_channels;
}
if (params->has_multifd_compression) {
dest->multifd_compression = params->multifd_compression;
}
if (params->has_xbzrle_cache_size) {
dest->xbzrle_cache_size = params->xbzrle_cache_size;
}
if (params->has_max_postcopy_bandwidth) {
dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
}
if (params->has_max_cpu_throttle) {
dest->max_cpu_throttle = params->max_cpu_throttle;
}
if (params->has_announce_initial) {
dest->announce_initial = params->announce_initial;
}
if (params->has_announce_max) {
dest->announce_max = params->announce_max;
}
if (params->has_announce_rounds) {
dest->announce_rounds = params->announce_rounds;
}
if (params->has_announce_step) {
dest->announce_step = params->announce_step;
}
if (params->has_block_bitmap_mapping) {
dest->has_block_bitmap_mapping = true;
dest->block_bitmap_mapping = params->block_bitmap_mapping;
}
if (params->has_x_vcpu_dirty_limit_period) {
dest->x_vcpu_dirty_limit_period =
params->x_vcpu_dirty_limit_period;
}
if (params->has_vcpu_dirty_limit) {
dest->vcpu_dirty_limit = params->vcpu_dirty_limit;
}
}
static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
{
MigrationState *s = migrate_get_current();
/* TODO use QAPI_CLONE() instead of duplicating it inline */
if (params->has_compress_level) {
s->parameters.compress_level = params->compress_level;
}
if (params->has_compress_threads) {
s->parameters.compress_threads = params->compress_threads;
}
if (params->has_compress_wait_thread) {
s->parameters.compress_wait_thread = params->compress_wait_thread;
}
if (params->has_decompress_threads) {
s->parameters.decompress_threads = params->decompress_threads;
}
if (params->has_throttle_trigger_threshold) {
s->parameters.throttle_trigger_threshold = params->throttle_trigger_threshold;
}
if (params->has_cpu_throttle_initial) {
s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
}
if (params->has_cpu_throttle_increment) {
s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
}
if (params->has_cpu_throttle_tailslow) {
s->parameters.cpu_throttle_tailslow = params->cpu_throttle_tailslow;
}
if (params->tls_creds) {
g_free(s->parameters.tls_creds);
assert(params->tls_creds->type == QTYPE_QSTRING);
s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
}
if (params->tls_hostname) {
g_free(s->parameters.tls_hostname);
assert(params->tls_hostname->type == QTYPE_QSTRING);
s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
}
if (params->tls_authz) {
g_free(s->parameters.tls_authz);
assert(params->tls_authz->type == QTYPE_QSTRING);
s->parameters.tls_authz = g_strdup(params->tls_authz->u.s);
}
if (params->has_max_bandwidth) {
s->parameters.max_bandwidth = params->max_bandwidth;
if (s->to_dst_file && !migration_in_postcopy()) {
migration_rate_set(s->parameters.max_bandwidth);
}
}
if (params->has_downtime_limit) {
s->parameters.downtime_limit = params->downtime_limit;
}
if (params->has_x_checkpoint_delay) {
s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
colo_checkpoint_delay_set();
}
if (params->has_block_incremental) {
s->parameters.block_incremental = params->block_incremental;
}
if (params->has_multifd_channels) {
s->parameters.multifd_channels = params->multifd_channels;
}
if (params->has_multifd_compression) {
s->parameters.multifd_compression = params->multifd_compression;
}
if (params->has_xbzrle_cache_size) {
s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
xbzrle_cache_resize(params->xbzrle_cache_size, errp);
}
if (params->has_max_postcopy_bandwidth) {
s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
if (s->to_dst_file && migration_in_postcopy()) {
migration_rate_set(s->parameters.max_postcopy_bandwidth);
}
}
if (params->has_max_cpu_throttle) {
s->parameters.max_cpu_throttle = params->max_cpu_throttle;
}
if (params->has_announce_initial) {
s->parameters.announce_initial = params->announce_initial;
}
if (params->has_announce_max) {
s->parameters.announce_max = params->announce_max;
}
if (params->has_announce_rounds) {
s->parameters.announce_rounds = params->announce_rounds;
}
if (params->has_announce_step) {
s->parameters.announce_step = params->announce_step;
}
if (params->has_block_bitmap_mapping) {
qapi_free_BitmapMigrationNodeAliasList(
s->parameters.block_bitmap_mapping);
s->parameters.has_block_bitmap_mapping = true;
s->parameters.block_bitmap_mapping =
QAPI_CLONE(BitmapMigrationNodeAliasList,
params->block_bitmap_mapping);
}
if (params->has_x_vcpu_dirty_limit_period) {
s->parameters.x_vcpu_dirty_limit_period =
params->x_vcpu_dirty_limit_period;
}
if (params->has_vcpu_dirty_limit) {
s->parameters.vcpu_dirty_limit = params->vcpu_dirty_limit;
}
}
void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
{
MigrationParameters tmp;
/* TODO Rewrite "" to null instead */
if (params->tls_creds
&& params->tls_creds->type == QTYPE_QNULL) {
qobject_unref(params->tls_creds->u.n);
params->tls_creds->type = QTYPE_QSTRING;
params->tls_creds->u.s = strdup("");
}
/* TODO Rewrite "" to null instead */
if (params->tls_hostname
&& params->tls_hostname->type == QTYPE_QNULL) {
qobject_unref(params->tls_hostname->u.n);
params->tls_hostname->type = QTYPE_QSTRING;
params->tls_hostname->u.s = strdup("");
}
migrate_params_test_apply(params, &tmp);
if (!migrate_params_check(&tmp, errp)) {
/* Invalid parameter */
return;
}
migrate_params_apply(params, errp);
}
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