32c3db5b26
Postcopy seems to have survived a cycle with only a few fixes, and Jiri has the current libvirt wired up and working ( https://www.redhat.com/archives/libvir-list/2016-March/msg00080.html ) so remove the experimental tag. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <1457690016-9070-3-git-send-email-dgilbert@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>
1811 lines
55 KiB
C
1811 lines
55 KiB
C
/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "migration/migration.h"
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#include "migration/qemu-file.h"
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#include "sysemu/sysemu.h"
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#include "block/block.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi/util.h"
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#include "qemu/sockets.h"
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#include "qemu/rcu.h"
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#include "migration/block.h"
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#include "migration/postcopy-ram.h"
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#include "qemu/thread.h"
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#include "qmp-commands.h"
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#include "trace.h"
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#include "qapi-event.h"
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#include "qom/cpu.h"
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#include "exec/memory.h"
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#include "exec/address-spaces.h"
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#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
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/* Amount of time to allocate to each "chunk" of bandwidth-throttled
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* data. */
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#define BUFFER_DELAY 100
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#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
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/* Default compression thread count */
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#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
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/* Default decompression thread count, usually decompression is at
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* least 4 times as fast as compression.*/
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#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
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/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
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#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
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/* Define default autoconverge cpu throttle migration parameters */
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#define DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL 20
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#define DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT 10
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/* Migration XBZRLE default cache size */
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#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
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static NotifierList migration_state_notifiers =
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NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
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static bool deferred_incoming;
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/*
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* Current state of incoming postcopy; note this is not part of
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* MigrationIncomingState since it's state is used during cleanup
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* at the end as MIS is being freed.
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*/
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static PostcopyState incoming_postcopy_state;
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/* When we add fault tolerance, we could have several
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migrations at once. For now we don't need to add
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dynamic creation of migration */
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/* For outgoing */
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MigrationState *migrate_get_current(void)
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{
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static bool once;
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static MigrationState current_migration = {
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.state = MIGRATION_STATUS_NONE,
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.bandwidth_limit = MAX_THROTTLE,
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.xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
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.mbps = -1,
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.parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] =
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DEFAULT_MIGRATE_COMPRESS_LEVEL,
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.parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] =
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DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT,
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.parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
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DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
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.parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] =
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DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL,
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.parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] =
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DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT,
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};
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if (!once) {
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qemu_mutex_init(¤t_migration.src_page_req_mutex);
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once = true;
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}
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return ¤t_migration;
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}
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/* For incoming */
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static MigrationIncomingState *mis_current;
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MigrationIncomingState *migration_incoming_get_current(void)
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{
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return mis_current;
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}
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MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
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{
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mis_current = g_new0(MigrationIncomingState, 1);
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mis_current->from_src_file = f;
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mis_current->state = MIGRATION_STATUS_NONE;
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QLIST_INIT(&mis_current->loadvm_handlers);
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qemu_mutex_init(&mis_current->rp_mutex);
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qemu_event_init(&mis_current->main_thread_load_event, false);
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return mis_current;
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}
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void migration_incoming_state_destroy(void)
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{
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qemu_event_destroy(&mis_current->main_thread_load_event);
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loadvm_free_handlers(mis_current);
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g_free(mis_current);
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mis_current = NULL;
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}
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typedef struct {
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bool optional;
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uint32_t size;
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uint8_t runstate[100];
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RunState state;
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bool received;
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} GlobalState;
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static GlobalState global_state;
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int global_state_store(void)
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{
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if (!runstate_store((char *)global_state.runstate,
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sizeof(global_state.runstate))) {
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error_report("runstate name too big: %s", global_state.runstate);
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trace_migrate_state_too_big();
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return -EINVAL;
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}
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return 0;
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}
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void global_state_store_running(void)
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{
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const char *state = RunState_lookup[RUN_STATE_RUNNING];
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strncpy((char *)global_state.runstate,
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state, sizeof(global_state.runstate));
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}
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static bool global_state_received(void)
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{
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return global_state.received;
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}
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static RunState global_state_get_runstate(void)
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{
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return global_state.state;
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}
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void global_state_set_optional(void)
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{
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global_state.optional = true;
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}
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static bool global_state_needed(void *opaque)
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{
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GlobalState *s = opaque;
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char *runstate = (char *)s->runstate;
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/* If it is not optional, it is mandatory */
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if (s->optional == false) {
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return true;
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}
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/* If state is running or paused, it is not needed */
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if (strcmp(runstate, "running") == 0 ||
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strcmp(runstate, "paused") == 0) {
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return false;
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}
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/* for any other state it is needed */
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return true;
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}
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static int global_state_post_load(void *opaque, int version_id)
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{
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GlobalState *s = opaque;
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Error *local_err = NULL;
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int r;
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char *runstate = (char *)s->runstate;
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s->received = true;
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trace_migrate_global_state_post_load(runstate);
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r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE__MAX,
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-1, &local_err);
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if (r == -1) {
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if (local_err) {
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error_report_err(local_err);
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}
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return -EINVAL;
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}
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s->state = r;
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return 0;
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}
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static void global_state_pre_save(void *opaque)
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{
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GlobalState *s = opaque;
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trace_migrate_global_state_pre_save((char *)s->runstate);
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s->size = strlen((char *)s->runstate) + 1;
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}
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static const VMStateDescription vmstate_globalstate = {
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.name = "globalstate",
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.version_id = 1,
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.minimum_version_id = 1,
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.post_load = global_state_post_load,
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.pre_save = global_state_pre_save,
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.needed = global_state_needed,
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.fields = (VMStateField[]) {
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VMSTATE_UINT32(size, GlobalState),
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VMSTATE_BUFFER(runstate, GlobalState),
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VMSTATE_END_OF_LIST()
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},
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};
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void register_global_state(void)
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{
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/* We would use it independently that we receive it */
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strcpy((char *)&global_state.runstate, "");
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global_state.received = false;
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vmstate_register(NULL, 0, &vmstate_globalstate, &global_state);
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}
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static void migrate_generate_event(int new_state)
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{
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if (migrate_use_events()) {
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qapi_event_send_migration(new_state, &error_abort);
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}
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}
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/*
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* Called on -incoming with a defer: uri.
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* The migration can be started later after any parameters have been
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* changed.
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*/
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static void deferred_incoming_migration(Error **errp)
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{
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if (deferred_incoming) {
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error_setg(errp, "Incoming migration already deferred");
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}
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deferred_incoming = true;
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}
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/* Request a range of pages from the source VM at the given
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* start address.
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* rbname: Name of the RAMBlock to request the page in, if NULL it's the same
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* as the last request (a name must have been given previously)
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* Start: Address offset within the RB
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* Len: Length in bytes required - must be a multiple of pagesize
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*/
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void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
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ram_addr_t start, size_t len)
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{
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uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname upto 256 */
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size_t msglen = 12; /* start + len */
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*(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
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*(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
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if (rbname) {
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int rbname_len = strlen(rbname);
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assert(rbname_len < 256);
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bufc[msglen++] = rbname_len;
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memcpy(bufc + msglen, rbname, rbname_len);
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msglen += rbname_len;
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migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc);
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} else {
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migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc);
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}
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}
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void qemu_start_incoming_migration(const char *uri, Error **errp)
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{
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const char *p;
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qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort);
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if (!strcmp(uri, "defer")) {
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deferred_incoming_migration(errp);
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} else if (strstart(uri, "tcp:", &p)) {
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tcp_start_incoming_migration(p, errp);
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#ifdef CONFIG_RDMA
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} else if (strstart(uri, "rdma:", &p)) {
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rdma_start_incoming_migration(p, errp);
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#endif
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#if !defined(WIN32)
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} else if (strstart(uri, "exec:", &p)) {
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exec_start_incoming_migration(p, errp);
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} else if (strstart(uri, "unix:", &p)) {
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unix_start_incoming_migration(p, errp);
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} else if (strstart(uri, "fd:", &p)) {
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fd_start_incoming_migration(p, errp);
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#endif
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} else {
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error_setg(errp, "unknown migration protocol: %s", uri);
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}
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}
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static void process_incoming_migration_bh(void *opaque)
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{
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Error *local_err = NULL;
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MigrationIncomingState *mis = opaque;
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/* Make sure all file formats flush their mutable metadata */
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bdrv_invalidate_cache_all(&local_err);
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if (local_err) {
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migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
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MIGRATION_STATUS_FAILED);
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error_report_err(local_err);
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migrate_decompress_threads_join();
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exit(EXIT_FAILURE);
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}
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/*
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* This must happen after all error conditions are dealt with and
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* we're sure the VM is going to be running on this host.
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*/
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qemu_announce_self();
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/* If global state section was not received or we are in running
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state, we need to obey autostart. Any other state is set with
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runstate_set. */
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if (!global_state_received() ||
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global_state_get_runstate() == RUN_STATE_RUNNING) {
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if (autostart) {
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vm_start();
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} else {
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runstate_set(RUN_STATE_PAUSED);
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}
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} else {
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runstate_set(global_state_get_runstate());
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}
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migrate_decompress_threads_join();
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/*
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* This must happen after any state changes since as soon as an external
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* observer sees this event they might start to prod at the VM assuming
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* it's ready to use.
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*/
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migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
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MIGRATION_STATUS_COMPLETED);
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qemu_bh_delete(mis->bh);
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migration_incoming_state_destroy();
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}
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static void process_incoming_migration_co(void *opaque)
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{
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QEMUFile *f = opaque;
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MigrationIncomingState *mis;
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PostcopyState ps;
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int ret;
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mis = migration_incoming_state_new(f);
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postcopy_state_set(POSTCOPY_INCOMING_NONE);
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migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
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MIGRATION_STATUS_ACTIVE);
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ret = qemu_loadvm_state(f);
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ps = postcopy_state_get();
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trace_process_incoming_migration_co_end(ret, ps);
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if (ps != POSTCOPY_INCOMING_NONE) {
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if (ps == POSTCOPY_INCOMING_ADVISE) {
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/*
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* Where a migration had postcopy enabled (and thus went to advise)
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* but managed to complete within the precopy period, we can use
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* the normal exit.
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*/
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postcopy_ram_incoming_cleanup(mis);
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} else if (ret >= 0) {
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/*
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* Postcopy was started, cleanup should happen at the end of the
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* postcopy thread.
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*/
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trace_process_incoming_migration_co_postcopy_end_main();
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return;
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}
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/* Else if something went wrong then just fall out of the normal exit */
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}
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qemu_fclose(f);
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free_xbzrle_decoded_buf();
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if (ret < 0) {
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migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
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MIGRATION_STATUS_FAILED);
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error_report("load of migration failed: %s", strerror(-ret));
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migrate_decompress_threads_join();
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exit(EXIT_FAILURE);
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}
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mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
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qemu_bh_schedule(mis->bh);
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}
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void process_incoming_migration(QEMUFile *f)
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{
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Coroutine *co = qemu_coroutine_create(process_incoming_migration_co);
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int fd = qemu_get_fd(f);
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assert(fd != -1);
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migrate_decompress_threads_create();
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qemu_set_nonblock(fd);
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qemu_coroutine_enter(co, f);
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}
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/*
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* Send a message on the return channel back to the source
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* of the migration.
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*/
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void migrate_send_rp_message(MigrationIncomingState *mis,
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enum mig_rp_message_type message_type,
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uint16_t len, void *data)
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{
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trace_migrate_send_rp_message((int)message_type, len);
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qemu_mutex_lock(&mis->rp_mutex);
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qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
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qemu_put_be16(mis->to_src_file, len);
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qemu_put_buffer(mis->to_src_file, data, len);
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qemu_fflush(mis->to_src_file);
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qemu_mutex_unlock(&mis->rp_mutex);
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}
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/*
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* Send a 'SHUT' message on the return channel with the given value
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* to indicate that we've finished with the RP. Non-0 value indicates
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* error.
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*/
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void migrate_send_rp_shut(MigrationIncomingState *mis,
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uint32_t value)
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{
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uint32_t buf;
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buf = cpu_to_be32(value);
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migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf);
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}
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/*
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* Send a 'PONG' message on the return channel with the given value
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* (normally in response to a 'PING')
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*/
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void migrate_send_rp_pong(MigrationIncomingState *mis,
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uint32_t value)
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{
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uint32_t buf;
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buf = cpu_to_be32(value);
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migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
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}
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/* amount of nanoseconds we are willing to wait for migration to be down.
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* the choice of nanoseconds is because it is the maximum resolution that
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* get_clock() can achieve. It is an internal measure. All user-visible
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* units must be in seconds */
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static uint64_t max_downtime = 300000000;
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uint64_t migrate_max_downtime(void)
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{
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return max_downtime;
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}
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MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
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{
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MigrationCapabilityStatusList *head = NULL;
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MigrationCapabilityStatusList *caps;
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MigrationState *s = migrate_get_current();
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int i;
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caps = NULL; /* silence compiler warning */
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for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
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|
if (head == NULL) {
|
|
head = g_malloc0(sizeof(*caps));
|
|
caps = head;
|
|
} else {
|
|
caps->next = g_malloc0(sizeof(*caps));
|
|
caps = caps->next;
|
|
}
|
|
caps->value =
|
|
g_malloc(sizeof(*caps->value));
|
|
caps->value->capability = i;
|
|
caps->value->state = s->enabled_capabilities[i];
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
MigrationParameters *qmp_query_migrate_parameters(Error **errp)
|
|
{
|
|
MigrationParameters *params;
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
params = g_malloc0(sizeof(*params));
|
|
params->compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
|
|
params->compress_threads =
|
|
s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
|
|
params->decompress_threads =
|
|
s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
|
|
params->x_cpu_throttle_initial =
|
|
s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL];
|
|
params->x_cpu_throttle_increment =
|
|
s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT];
|
|
|
|
return params;
|
|
}
|
|
|
|
/*
|
|
* Return true if we're already in the middle of a migration
|
|
* (i.e. any of the active or setup states)
|
|
*/
|
|
static bool migration_is_setup_or_active(int state)
|
|
{
|
|
switch (state) {
|
|
case MIGRATION_STATUS_ACTIVE:
|
|
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
|
|
case MIGRATION_STATUS_SETUP:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
|
|
}
|
|
}
|
|
|
|
static void get_xbzrle_cache_stats(MigrationInfo *info)
|
|
{
|
|
if (migrate_use_xbzrle()) {
|
|
info->has_xbzrle_cache = true;
|
|
info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
|
|
info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
|
|
info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred();
|
|
info->xbzrle_cache->pages = xbzrle_mig_pages_transferred();
|
|
info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss();
|
|
info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate();
|
|
info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow();
|
|
}
|
|
}
|
|
|
|
MigrationInfo *qmp_query_migrate(Error **errp)
|
|
{
|
|
MigrationInfo *info = g_malloc0(sizeof(*info));
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
switch (s->state) {
|
|
case MIGRATION_STATUS_NONE:
|
|
/* no migration has happened ever */
|
|
break;
|
|
case MIGRATION_STATUS_SETUP:
|
|
info->has_status = true;
|
|
info->has_total_time = false;
|
|
break;
|
|
case MIGRATION_STATUS_ACTIVE:
|
|
case MIGRATION_STATUS_CANCELLING:
|
|
info->has_status = true;
|
|
info->has_total_time = true;
|
|
info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
|
|
- s->total_time;
|
|
info->has_expected_downtime = true;
|
|
info->expected_downtime = s->expected_downtime;
|
|
info->has_setup_time = true;
|
|
info->setup_time = s->setup_time;
|
|
|
|
info->has_ram = true;
|
|
info->ram = g_malloc0(sizeof(*info->ram));
|
|
info->ram->transferred = ram_bytes_transferred();
|
|
info->ram->remaining = ram_bytes_remaining();
|
|
info->ram->total = ram_bytes_total();
|
|
info->ram->duplicate = dup_mig_pages_transferred();
|
|
info->ram->skipped = skipped_mig_pages_transferred();
|
|
info->ram->normal = norm_mig_pages_transferred();
|
|
info->ram->normal_bytes = norm_mig_bytes_transferred();
|
|
info->ram->dirty_pages_rate = s->dirty_pages_rate;
|
|
info->ram->mbps = s->mbps;
|
|
info->ram->dirty_sync_count = s->dirty_sync_count;
|
|
|
|
if (blk_mig_active()) {
|
|
info->has_disk = true;
|
|
info->disk = g_malloc0(sizeof(*info->disk));
|
|
info->disk->transferred = blk_mig_bytes_transferred();
|
|
info->disk->remaining = blk_mig_bytes_remaining();
|
|
info->disk->total = blk_mig_bytes_total();
|
|
}
|
|
|
|
if (cpu_throttle_active()) {
|
|
info->has_x_cpu_throttle_percentage = true;
|
|
info->x_cpu_throttle_percentage = cpu_throttle_get_percentage();
|
|
}
|
|
|
|
get_xbzrle_cache_stats(info);
|
|
break;
|
|
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
|
|
/* Mostly the same as active; TODO add some postcopy stats */
|
|
info->has_status = true;
|
|
info->has_total_time = true;
|
|
info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
|
|
- s->total_time;
|
|
info->has_expected_downtime = true;
|
|
info->expected_downtime = s->expected_downtime;
|
|
info->has_setup_time = true;
|
|
info->setup_time = s->setup_time;
|
|
|
|
info->has_ram = true;
|
|
info->ram = g_malloc0(sizeof(*info->ram));
|
|
info->ram->transferred = ram_bytes_transferred();
|
|
info->ram->remaining = ram_bytes_remaining();
|
|
info->ram->total = ram_bytes_total();
|
|
info->ram->duplicate = dup_mig_pages_transferred();
|
|
info->ram->skipped = skipped_mig_pages_transferred();
|
|
info->ram->normal = norm_mig_pages_transferred();
|
|
info->ram->normal_bytes = norm_mig_bytes_transferred();
|
|
info->ram->dirty_pages_rate = s->dirty_pages_rate;
|
|
info->ram->mbps = s->mbps;
|
|
info->ram->dirty_sync_count = s->dirty_sync_count;
|
|
|
|
if (blk_mig_active()) {
|
|
info->has_disk = true;
|
|
info->disk = g_malloc0(sizeof(*info->disk));
|
|
info->disk->transferred = blk_mig_bytes_transferred();
|
|
info->disk->remaining = blk_mig_bytes_remaining();
|
|
info->disk->total = blk_mig_bytes_total();
|
|
}
|
|
|
|
get_xbzrle_cache_stats(info);
|
|
break;
|
|
case MIGRATION_STATUS_COMPLETED:
|
|
get_xbzrle_cache_stats(info);
|
|
|
|
info->has_status = true;
|
|
info->has_total_time = true;
|
|
info->total_time = s->total_time;
|
|
info->has_downtime = true;
|
|
info->downtime = s->downtime;
|
|
info->has_setup_time = true;
|
|
info->setup_time = s->setup_time;
|
|
|
|
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->duplicate = dup_mig_pages_transferred();
|
|
info->ram->skipped = skipped_mig_pages_transferred();
|
|
info->ram->normal = norm_mig_pages_transferred();
|
|
info->ram->normal_bytes = norm_mig_bytes_transferred();
|
|
info->ram->mbps = s->mbps;
|
|
info->ram->dirty_sync_count = s->dirty_sync_count;
|
|
break;
|
|
case MIGRATION_STATUS_FAILED:
|
|
info->has_status = true;
|
|
break;
|
|
case MIGRATION_STATUS_CANCELLED:
|
|
info->has_status = true;
|
|
break;
|
|
}
|
|
info->status = s->state;
|
|
|
|
return info;
|
|
}
|
|
|
|
void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
|
|
Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
MigrationCapabilityStatusList *cap;
|
|
|
|
if (migration_is_setup_or_active(s->state)) {
|
|
error_setg(errp, QERR_MIGRATION_ACTIVE);
|
|
return;
|
|
}
|
|
|
|
for (cap = params; cap; cap = cap->next) {
|
|
s->enabled_capabilities[cap->value->capability] = cap->value->state;
|
|
}
|
|
|
|
if (migrate_postcopy_ram()) {
|
|
if (migrate_use_compression()) {
|
|
/* The decompression threads asynchronously write into RAM
|
|
* rather than use the atomic copies needed to avoid
|
|
* userfaulting. It should be possible to fix the decompression
|
|
* threads for compatibility in future.
|
|
*/
|
|
error_report("Postcopy is not currently compatible with "
|
|
"compression");
|
|
s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] =
|
|
false;
|
|
}
|
|
}
|
|
}
|
|
|
|
void qmp_migrate_set_parameters(bool has_compress_level,
|
|
int64_t compress_level,
|
|
bool has_compress_threads,
|
|
int64_t compress_threads,
|
|
bool has_decompress_threads,
|
|
int64_t decompress_threads,
|
|
bool has_x_cpu_throttle_initial,
|
|
int64_t x_cpu_throttle_initial,
|
|
bool has_x_cpu_throttle_increment,
|
|
int64_t x_cpu_throttle_increment, Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
if (has_compress_level && (compress_level < 0 || compress_level > 9)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
|
|
"is invalid, it should be in the range of 0 to 9");
|
|
return;
|
|
}
|
|
if (has_compress_threads &&
|
|
(compress_threads < 1 || compress_threads > 255)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"compress_threads",
|
|
"is invalid, it should be in the range of 1 to 255");
|
|
return;
|
|
}
|
|
if (has_decompress_threads &&
|
|
(decompress_threads < 1 || decompress_threads > 255)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"decompress_threads",
|
|
"is invalid, it should be in the range of 1 to 255");
|
|
return;
|
|
}
|
|
if (has_x_cpu_throttle_initial &&
|
|
(x_cpu_throttle_initial < 1 || x_cpu_throttle_initial > 99)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"x_cpu_throttle_initial",
|
|
"an integer in the range of 1 to 99");
|
|
}
|
|
if (has_x_cpu_throttle_increment &&
|
|
(x_cpu_throttle_increment < 1 || x_cpu_throttle_increment > 99)) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
|
|
"x_cpu_throttle_increment",
|
|
"an integer in the range of 1 to 99");
|
|
}
|
|
|
|
if (has_compress_level) {
|
|
s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level;
|
|
}
|
|
if (has_compress_threads) {
|
|
s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = compress_threads;
|
|
}
|
|
if (has_decompress_threads) {
|
|
s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
|
|
decompress_threads;
|
|
}
|
|
if (has_x_cpu_throttle_initial) {
|
|
s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] =
|
|
x_cpu_throttle_initial;
|
|
}
|
|
|
|
if (has_x_cpu_throttle_increment) {
|
|
s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] =
|
|
x_cpu_throttle_increment;
|
|
}
|
|
}
|
|
|
|
void qmp_migrate_start_postcopy(Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
if (!migrate_postcopy_ram()) {
|
|
error_setg(errp, "Enable postcopy with migrate_set_capability before"
|
|
" the start of migration");
|
|
return;
|
|
}
|
|
|
|
if (s->state == MIGRATION_STATUS_NONE) {
|
|
error_setg(errp, "Postcopy must be started after migration has been"
|
|
" started");
|
|
return;
|
|
}
|
|
/*
|
|
* we don't error if migration has finished since that would be racy
|
|
* with issuing this command.
|
|
*/
|
|
atomic_set(&s->start_postcopy, true);
|
|
}
|
|
|
|
/* shared migration helpers */
|
|
|
|
void migrate_set_state(int *state, int old_state, int new_state)
|
|
{
|
|
if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
|
|
trace_migrate_set_state(new_state);
|
|
migrate_generate_event(new_state);
|
|
}
|
|
}
|
|
|
|
static void migrate_fd_cleanup(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
|
|
qemu_bh_delete(s->cleanup_bh);
|
|
s->cleanup_bh = NULL;
|
|
|
|
flush_page_queue(s);
|
|
|
|
if (s->to_dst_file) {
|
|
trace_migrate_fd_cleanup();
|
|
qemu_mutex_unlock_iothread();
|
|
if (s->migration_thread_running) {
|
|
qemu_thread_join(&s->thread);
|
|
s->migration_thread_running = false;
|
|
}
|
|
qemu_mutex_lock_iothread();
|
|
|
|
migrate_compress_threads_join();
|
|
qemu_fclose(s->to_dst_file);
|
|
s->to_dst_file = NULL;
|
|
}
|
|
|
|
assert((s->state != MIGRATION_STATUS_ACTIVE) &&
|
|
(s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));
|
|
|
|
if (s->state == MIGRATION_STATUS_CANCELLING) {
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
|
|
MIGRATION_STATUS_CANCELLED);
|
|
}
|
|
|
|
notifier_list_notify(&migration_state_notifiers, s);
|
|
}
|
|
|
|
void migrate_fd_error(MigrationState *s)
|
|
{
|
|
trace_migrate_fd_error();
|
|
assert(s->to_dst_file == NULL);
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_FAILED);
|
|
notifier_list_notify(&migration_state_notifiers, s);
|
|
}
|
|
|
|
static void migrate_fd_cancel(MigrationState *s)
|
|
{
|
|
int old_state ;
|
|
QEMUFile *f = migrate_get_current()->to_dst_file;
|
|
trace_migrate_fd_cancel();
|
|
|
|
if (s->rp_state.from_dst_file) {
|
|
/* shutdown the rp socket, so causing the rp thread to shutdown */
|
|
qemu_file_shutdown(s->rp_state.from_dst_file);
|
|
}
|
|
|
|
do {
|
|
old_state = s->state;
|
|
if (!migration_is_setup_or_active(old_state)) {
|
|
break;
|
|
}
|
|
migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
|
|
} while (s->state != MIGRATION_STATUS_CANCELLING);
|
|
|
|
/*
|
|
* If we're unlucky the migration code might be stuck somewhere in a
|
|
* send/write while the network has failed and is waiting to timeout;
|
|
* if we've got shutdown(2) available then we can force it to quit.
|
|
* The outgoing qemu file gets closed in migrate_fd_cleanup that is
|
|
* called in a bh, so there is no race against this cancel.
|
|
*/
|
|
if (s->state == MIGRATION_STATUS_CANCELLING && f) {
|
|
qemu_file_shutdown(f);
|
|
}
|
|
}
|
|
|
|
void add_migration_state_change_notifier(Notifier *notify)
|
|
{
|
|
notifier_list_add(&migration_state_notifiers, notify);
|
|
}
|
|
|
|
void remove_migration_state_change_notifier(Notifier *notify)
|
|
{
|
|
notifier_remove(notify);
|
|
}
|
|
|
|
bool migration_in_setup(MigrationState *s)
|
|
{
|
|
return s->state == MIGRATION_STATUS_SETUP;
|
|
}
|
|
|
|
bool migration_has_finished(MigrationState *s)
|
|
{
|
|
return s->state == MIGRATION_STATUS_COMPLETED;
|
|
}
|
|
|
|
bool migration_has_failed(MigrationState *s)
|
|
{
|
|
return (s->state == MIGRATION_STATUS_CANCELLED ||
|
|
s->state == MIGRATION_STATUS_FAILED);
|
|
}
|
|
|
|
bool migration_in_postcopy(MigrationState *s)
|
|
{
|
|
return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
|
|
}
|
|
|
|
bool migration_in_postcopy_after_devices(MigrationState *s)
|
|
{
|
|
return migration_in_postcopy(s) && s->postcopy_after_devices;
|
|
}
|
|
|
|
MigrationState *migrate_init(const MigrationParams *params)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
|
|
/*
|
|
* Reinitialise all migration state, except
|
|
* parameters/capabilities that the user set, and
|
|
* locks.
|
|
*/
|
|
s->bytes_xfer = 0;
|
|
s->xfer_limit = 0;
|
|
s->cleanup_bh = 0;
|
|
s->to_dst_file = NULL;
|
|
s->state = MIGRATION_STATUS_NONE;
|
|
s->params = *params;
|
|
s->rp_state.from_dst_file = NULL;
|
|
s->rp_state.error = false;
|
|
s->mbps = 0.0;
|
|
s->downtime = 0;
|
|
s->expected_downtime = 0;
|
|
s->dirty_pages_rate = 0;
|
|
s->dirty_bytes_rate = 0;
|
|
s->setup_time = 0;
|
|
s->dirty_sync_count = 0;
|
|
s->start_postcopy = false;
|
|
s->postcopy_after_devices = false;
|
|
s->migration_thread_running = false;
|
|
s->last_req_rb = NULL;
|
|
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
|
|
|
|
QSIMPLEQ_INIT(&s->src_page_requests);
|
|
|
|
s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
return s;
|
|
}
|
|
|
|
static GSList *migration_blockers;
|
|
|
|
void migrate_add_blocker(Error *reason)
|
|
{
|
|
migration_blockers = g_slist_prepend(migration_blockers, reason);
|
|
}
|
|
|
|
void migrate_del_blocker(Error *reason)
|
|
{
|
|
migration_blockers = g_slist_remove(migration_blockers, reason);
|
|
}
|
|
|
|
void qmp_migrate_incoming(const char *uri, Error **errp)
|
|
{
|
|
Error *local_err = NULL;
|
|
static bool once = true;
|
|
|
|
if (!deferred_incoming) {
|
|
error_setg(errp, "For use with '-incoming defer'");
|
|
return;
|
|
}
|
|
if (!once) {
|
|
error_setg(errp, "The incoming migration has already been started");
|
|
}
|
|
|
|
qemu_start_incoming_migration(uri, &local_err);
|
|
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
|
|
once = false;
|
|
}
|
|
|
|
void qmp_migrate(const char *uri, bool has_blk, bool blk,
|
|
bool has_inc, bool inc, bool has_detach, bool detach,
|
|
Error **errp)
|
|
{
|
|
Error *local_err = NULL;
|
|
MigrationState *s = migrate_get_current();
|
|
MigrationParams params;
|
|
const char *p;
|
|
|
|
params.blk = has_blk && blk;
|
|
params.shared = has_inc && inc;
|
|
|
|
if (migration_is_setup_or_active(s->state) ||
|
|
s->state == MIGRATION_STATUS_CANCELLING) {
|
|
error_setg(errp, QERR_MIGRATION_ACTIVE);
|
|
return;
|
|
}
|
|
if (runstate_check(RUN_STATE_INMIGRATE)) {
|
|
error_setg(errp, "Guest is waiting for an incoming migration");
|
|
return;
|
|
}
|
|
|
|
if (qemu_savevm_state_blocked(errp)) {
|
|
return;
|
|
}
|
|
|
|
if (migration_blockers) {
|
|
*errp = error_copy(migration_blockers->data);
|
|
return;
|
|
}
|
|
|
|
s = migrate_init(¶ms);
|
|
|
|
if (strstart(uri, "tcp:", &p)) {
|
|
tcp_start_outgoing_migration(s, p, &local_err);
|
|
#ifdef CONFIG_RDMA
|
|
} else if (strstart(uri, "rdma:", &p)) {
|
|
rdma_start_outgoing_migration(s, p, &local_err);
|
|
#endif
|
|
#if !defined(WIN32)
|
|
} else if (strstart(uri, "exec:", &p)) {
|
|
exec_start_outgoing_migration(s, p, &local_err);
|
|
} else if (strstart(uri, "unix:", &p)) {
|
|
unix_start_outgoing_migration(s, p, &local_err);
|
|
} else if (strstart(uri, "fd:", &p)) {
|
|
fd_start_outgoing_migration(s, p, &local_err);
|
|
#endif
|
|
} else {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
|
|
"a valid migration protocol");
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_FAILED);
|
|
return;
|
|
}
|
|
|
|
if (local_err) {
|
|
migrate_fd_error(s);
|
|
error_propagate(errp, local_err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
void qmp_migrate_cancel(Error **errp)
|
|
{
|
|
migrate_fd_cancel(migrate_get_current());
|
|
}
|
|
|
|
void qmp_migrate_set_cache_size(int64_t value, Error **errp)
|
|
{
|
|
MigrationState *s = migrate_get_current();
|
|
int64_t new_size;
|
|
|
|
/* Check for truncation */
|
|
if (value != (size_t)value) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
|
|
"exceeding address space");
|
|
return;
|
|
}
|
|
|
|
/* Cache should not be larger than guest ram size */
|
|
if (value > ram_bytes_total()) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
|
|
"exceeds guest ram size ");
|
|
return;
|
|
}
|
|
|
|
new_size = xbzrle_cache_resize(value);
|
|
if (new_size < 0) {
|
|
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
|
|
"is smaller than page size");
|
|
return;
|
|
}
|
|
|
|
s->xbzrle_cache_size = new_size;
|
|
}
|
|
|
|
int64_t qmp_query_migrate_cache_size(Error **errp)
|
|
{
|
|
return migrate_xbzrle_cache_size();
|
|
}
|
|
|
|
void qmp_migrate_set_speed(int64_t value, Error **errp)
|
|
{
|
|
MigrationState *s;
|
|
|
|
if (value < 0) {
|
|
value = 0;
|
|
}
|
|
if (value > SIZE_MAX) {
|
|
value = SIZE_MAX;
|
|
}
|
|
|
|
s = migrate_get_current();
|
|
s->bandwidth_limit = value;
|
|
if (s->to_dst_file) {
|
|
qemu_file_set_rate_limit(s->to_dst_file,
|
|
s->bandwidth_limit / XFER_LIMIT_RATIO);
|
|
}
|
|
}
|
|
|
|
void qmp_migrate_set_downtime(double value, Error **errp)
|
|
{
|
|
value *= 1e9;
|
|
value = MAX(0, MIN(UINT64_MAX, value));
|
|
max_downtime = (uint64_t)value;
|
|
}
|
|
|
|
bool migrate_postcopy_ram(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
|
|
}
|
|
|
|
bool migrate_auto_converge(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
|
|
}
|
|
|
|
bool migrate_zero_blocks(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
|
|
}
|
|
|
|
bool migrate_use_compression(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
|
|
}
|
|
|
|
int migrate_compress_level(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
|
|
}
|
|
|
|
int migrate_compress_threads(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
|
|
}
|
|
|
|
int migrate_decompress_threads(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
|
|
}
|
|
|
|
bool migrate_use_events(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
|
|
}
|
|
|
|
int migrate_use_xbzrle(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
|
|
}
|
|
|
|
int64_t migrate_xbzrle_cache_size(void)
|
|
{
|
|
MigrationState *s;
|
|
|
|
s = migrate_get_current();
|
|
|
|
return s->xbzrle_cache_size;
|
|
}
|
|
|
|
/* migration thread support */
|
|
/*
|
|
* Something bad happened to the RP stream, mark an error
|
|
* The caller shall print or trace something to indicate why
|
|
*/
|
|
static void mark_source_rp_bad(MigrationState *s)
|
|
{
|
|
s->rp_state.error = true;
|
|
}
|
|
|
|
static struct rp_cmd_args {
|
|
ssize_t len; /* -1 = variable */
|
|
const char *name;
|
|
} rp_cmd_args[] = {
|
|
[MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" },
|
|
[MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" },
|
|
[MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" },
|
|
[MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
|
|
[MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
|
|
[MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
|
|
};
|
|
|
|
/*
|
|
* Process a request for pages received on the return path,
|
|
* We're allowed to send more than requested (e.g. to round to our page size)
|
|
* and we don't need to send pages that have already been sent.
|
|
*/
|
|
static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
|
|
ram_addr_t start, size_t len)
|
|
{
|
|
long our_host_ps = getpagesize();
|
|
|
|
trace_migrate_handle_rp_req_pages(rbname, start, len);
|
|
|
|
/*
|
|
* Since we currently insist on matching page sizes, just sanity check
|
|
* we're being asked for whole host pages.
|
|
*/
|
|
if (start & (our_host_ps-1) ||
|
|
(len & (our_host_ps-1))) {
|
|
error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
|
|
" len: %zd", __func__, start, len);
|
|
mark_source_rp_bad(ms);
|
|
return;
|
|
}
|
|
|
|
if (ram_save_queue_pages(ms, rbname, start, len)) {
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handles messages sent on the return path towards the source VM
|
|
*
|
|
*/
|
|
static void *source_return_path_thread(void *opaque)
|
|
{
|
|
MigrationState *ms = opaque;
|
|
QEMUFile *rp = ms->rp_state.from_dst_file;
|
|
uint16_t header_len, header_type;
|
|
uint8_t buf[512];
|
|
uint32_t tmp32, sibling_error;
|
|
ram_addr_t start = 0; /* =0 to silence warning */
|
|
size_t len = 0, expected_len;
|
|
int res;
|
|
|
|
trace_source_return_path_thread_entry();
|
|
while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
|
|
migration_is_setup_or_active(ms->state)) {
|
|
trace_source_return_path_thread_loop_top();
|
|
header_type = qemu_get_be16(rp);
|
|
header_len = qemu_get_be16(rp);
|
|
|
|
if (header_type >= MIG_RP_MSG_MAX ||
|
|
header_type == MIG_RP_MSG_INVALID) {
|
|
error_report("RP: Received invalid message 0x%04x length 0x%04x",
|
|
header_type, header_len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
|
|
if ((rp_cmd_args[header_type].len != -1 &&
|
|
header_len != rp_cmd_args[header_type].len) ||
|
|
header_len > sizeof(buf)) {
|
|
error_report("RP: Received '%s' message (0x%04x) with"
|
|
"incorrect length %d expecting %zu",
|
|
rp_cmd_args[header_type].name, header_type, header_len,
|
|
(size_t)rp_cmd_args[header_type].len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
|
|
/* We know we've got a valid header by this point */
|
|
res = qemu_get_buffer(rp, buf, header_len);
|
|
if (res != header_len) {
|
|
error_report("RP: Failed reading data for message 0x%04x"
|
|
" read %d expected %d",
|
|
header_type, res, header_len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
|
|
/* OK, we have the message and the data */
|
|
switch (header_type) {
|
|
case MIG_RP_MSG_SHUT:
|
|
sibling_error = be32_to_cpup((uint32_t *)buf);
|
|
trace_source_return_path_thread_shut(sibling_error);
|
|
if (sibling_error) {
|
|
error_report("RP: Sibling indicated error %d", sibling_error);
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
/*
|
|
* We'll let the main thread deal with closing the RP
|
|
* we could do a shutdown(2) on it, but we're the only user
|
|
* anyway, so there's nothing gained.
|
|
*/
|
|
goto out;
|
|
|
|
case MIG_RP_MSG_PONG:
|
|
tmp32 = be32_to_cpup((uint32_t *)buf);
|
|
trace_source_return_path_thread_pong(tmp32);
|
|
break;
|
|
|
|
case MIG_RP_MSG_REQ_PAGES:
|
|
start = be64_to_cpup((uint64_t *)buf);
|
|
len = be32_to_cpup((uint32_t *)(buf + 8));
|
|
migrate_handle_rp_req_pages(ms, NULL, start, len);
|
|
break;
|
|
|
|
case MIG_RP_MSG_REQ_PAGES_ID:
|
|
expected_len = 12 + 1; /* header + termination */
|
|
|
|
if (header_len >= expected_len) {
|
|
start = be64_to_cpup((uint64_t *)buf);
|
|
len = be32_to_cpup((uint32_t *)(buf + 8));
|
|
/* Now we expect an idstr */
|
|
tmp32 = buf[12]; /* Length of the following idstr */
|
|
buf[13 + tmp32] = '\0';
|
|
expected_len += tmp32;
|
|
}
|
|
if (header_len != expected_len) {
|
|
error_report("RP: Req_Page_id with length %d expecting %zd",
|
|
header_len, expected_len);
|
|
mark_source_rp_bad(ms);
|
|
goto out;
|
|
}
|
|
migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
if (qemu_file_get_error(rp)) {
|
|
trace_source_return_path_thread_bad_end();
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
|
|
trace_source_return_path_thread_end();
|
|
out:
|
|
ms->rp_state.from_dst_file = NULL;
|
|
qemu_fclose(rp);
|
|
return NULL;
|
|
}
|
|
|
|
static int open_return_path_on_source(MigrationState *ms)
|
|
{
|
|
|
|
ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
|
|
if (!ms->rp_state.from_dst_file) {
|
|
return -1;
|
|
}
|
|
|
|
trace_open_return_path_on_source();
|
|
qemu_thread_create(&ms->rp_state.rp_thread, "return path",
|
|
source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
|
|
|
|
trace_open_return_path_on_source_continue();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Returns 0 if the RP was ok, otherwise there was an error on the RP */
|
|
static int await_return_path_close_on_source(MigrationState *ms)
|
|
{
|
|
/*
|
|
* If this is a normal exit then the destination will send a SHUT and the
|
|
* rp_thread will exit, however if there's an error we need to cause
|
|
* it to exit.
|
|
*/
|
|
if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
|
|
/*
|
|
* shutdown(2), if we have it, will cause it to unblock if it's stuck
|
|
* waiting for the destination.
|
|
*/
|
|
qemu_file_shutdown(ms->rp_state.from_dst_file);
|
|
mark_source_rp_bad(ms);
|
|
}
|
|
trace_await_return_path_close_on_source_joining();
|
|
qemu_thread_join(&ms->rp_state.rp_thread);
|
|
trace_await_return_path_close_on_source_close();
|
|
return ms->rp_state.error;
|
|
}
|
|
|
|
/*
|
|
* Switch from normal iteration to postcopy
|
|
* Returns non-0 on error
|
|
*/
|
|
static int postcopy_start(MigrationState *ms, bool *old_vm_running)
|
|
{
|
|
int ret;
|
|
const QEMUSizedBuffer *qsb;
|
|
int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
|
|
MIGRATION_STATUS_POSTCOPY_ACTIVE);
|
|
|
|
trace_postcopy_start();
|
|
qemu_mutex_lock_iothread();
|
|
trace_postcopy_start_set_run();
|
|
|
|
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
|
|
*old_vm_running = runstate_is_running();
|
|
global_state_store();
|
|
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = bdrv_inactivate_all();
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Cause any non-postcopiable, but iterative devices to
|
|
* send out their final data.
|
|
*/
|
|
qemu_savevm_state_complete_precopy(ms->to_dst_file, true);
|
|
|
|
/*
|
|
* in Finish migrate and with the io-lock held everything should
|
|
* be quiet, but we've potentially still got dirty pages and we
|
|
* need to tell the destination to throw any pages it's already received
|
|
* that are dirty
|
|
*/
|
|
if (ram_postcopy_send_discard_bitmap(ms)) {
|
|
error_report("postcopy send discard bitmap failed");
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* send rest of state - note things that are doing postcopy
|
|
* will notice we're in POSTCOPY_ACTIVE and not actually
|
|
* wrap their state up here
|
|
*/
|
|
qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
|
|
/* Ping just for debugging, helps line traces up */
|
|
qemu_savevm_send_ping(ms->to_dst_file, 2);
|
|
|
|
/*
|
|
* While loading the device state we may trigger page transfer
|
|
* requests and the fd must be free to process those, and thus
|
|
* the destination must read the whole device state off the fd before
|
|
* it starts processing it. Unfortunately the ad-hoc migration format
|
|
* doesn't allow the destination to know the size to read without fully
|
|
* parsing it through each devices load-state code (especially the open
|
|
* coded devices that use get/put).
|
|
* So we wrap the device state up in a package with a length at the start;
|
|
* to do this we use a qemu_buf to hold the whole of the device state.
|
|
*/
|
|
QEMUFile *fb = qemu_bufopen("w", NULL);
|
|
if (!fb) {
|
|
error_report("Failed to create buffered file");
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Make sure the receiver can get incoming pages before we send the rest
|
|
* of the state
|
|
*/
|
|
qemu_savevm_send_postcopy_listen(fb);
|
|
|
|
qemu_savevm_state_complete_precopy(fb, false);
|
|
qemu_savevm_send_ping(fb, 3);
|
|
|
|
qemu_savevm_send_postcopy_run(fb);
|
|
|
|
/* <><> end of stuff going into the package */
|
|
qsb = qemu_buf_get(fb);
|
|
|
|
/* Now send that blob */
|
|
if (qemu_savevm_send_packaged(ms->to_dst_file, qsb)) {
|
|
goto fail_closefb;
|
|
}
|
|
qemu_fclose(fb);
|
|
|
|
/* Send a notify to give a chance for anything that needs to happen
|
|
* at the transition to postcopy and after the device state; in particular
|
|
* spice needs to trigger a transition now
|
|
*/
|
|
ms->postcopy_after_devices = true;
|
|
notifier_list_notify(&migration_state_notifiers, ms);
|
|
|
|
ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
|
|
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
/*
|
|
* Although this ping is just for debug, it could potentially be
|
|
* used for getting a better measurement of downtime at the source.
|
|
*/
|
|
qemu_savevm_send_ping(ms->to_dst_file, 4);
|
|
|
|
ret = qemu_file_get_error(ms->to_dst_file);
|
|
if (ret) {
|
|
error_report("postcopy_start: Migration stream errored");
|
|
migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
|
|
MIGRATION_STATUS_FAILED);
|
|
}
|
|
|
|
return ret;
|
|
|
|
fail_closefb:
|
|
qemu_fclose(fb);
|
|
fail:
|
|
migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
|
|
MIGRATION_STATUS_FAILED);
|
|
qemu_mutex_unlock_iothread();
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* migration_completion: Used by migration_thread when there's not much left.
|
|
* The caller 'breaks' the loop when this returns.
|
|
*
|
|
* @s: Current migration state
|
|
* @current_active_state: The migration state we expect to be in
|
|
* @*old_vm_running: Pointer to old_vm_running flag
|
|
* @*start_time: Pointer to time to update
|
|
*/
|
|
static void migration_completion(MigrationState *s, int current_active_state,
|
|
bool *old_vm_running,
|
|
int64_t *start_time)
|
|
{
|
|
int ret;
|
|
|
|
if (s->state == MIGRATION_STATUS_ACTIVE) {
|
|
qemu_mutex_lock_iothread();
|
|
*start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
|
|
*old_vm_running = runstate_is_running();
|
|
ret = global_state_store();
|
|
|
|
if (!ret) {
|
|
ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
|
|
if (ret >= 0) {
|
|
ret = bdrv_inactivate_all();
|
|
}
|
|
if (ret >= 0) {
|
|
qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
|
|
qemu_savevm_state_complete_precopy(s->to_dst_file, false);
|
|
}
|
|
}
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
} else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
|
|
trace_migration_completion_postcopy_end();
|
|
|
|
qemu_savevm_state_complete_postcopy(s->to_dst_file);
|
|
trace_migration_completion_postcopy_end_after_complete();
|
|
}
|
|
|
|
/*
|
|
* If rp was opened we must clean up the thread before
|
|
* cleaning everything else up (since if there are no failures
|
|
* it will wait for the destination to send it's status in
|
|
* a SHUT command).
|
|
* Postcopy opens rp if enabled (even if it's not avtivated)
|
|
*/
|
|
if (migrate_postcopy_ram()) {
|
|
int rp_error;
|
|
trace_migration_completion_postcopy_end_before_rp();
|
|
rp_error = await_return_path_close_on_source(s);
|
|
trace_migration_completion_postcopy_end_after_rp(rp_error);
|
|
if (rp_error) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (qemu_file_get_error(s->to_dst_file)) {
|
|
trace_migration_completion_file_err();
|
|
goto fail;
|
|
}
|
|
|
|
migrate_set_state(&s->state, current_active_state,
|
|
MIGRATION_STATUS_COMPLETED);
|
|
return;
|
|
|
|
fail:
|
|
migrate_set_state(&s->state, current_active_state,
|
|
MIGRATION_STATUS_FAILED);
|
|
}
|
|
|
|
/*
|
|
* Master migration thread on the source VM.
|
|
* It drives the migration and pumps the data down the outgoing channel.
|
|
*/
|
|
static void *migration_thread(void *opaque)
|
|
{
|
|
MigrationState *s = opaque;
|
|
/* Used by the bandwidth calcs, updated later */
|
|
int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
|
|
int64_t initial_bytes = 0;
|
|
int64_t max_size = 0;
|
|
int64_t start_time = initial_time;
|
|
int64_t end_time;
|
|
bool old_vm_running = false;
|
|
bool entered_postcopy = false;
|
|
/* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
|
|
enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE;
|
|
|
|
rcu_register_thread();
|
|
|
|
qemu_savevm_state_header(s->to_dst_file);
|
|
|
|
if (migrate_postcopy_ram()) {
|
|
/* Now tell the dest that it should open its end so it can reply */
|
|
qemu_savevm_send_open_return_path(s->to_dst_file);
|
|
|
|
/* And do a ping that will make stuff easier to debug */
|
|
qemu_savevm_send_ping(s->to_dst_file, 1);
|
|
|
|
/*
|
|
* Tell the destination that we *might* want to do postcopy later;
|
|
* if the other end can't do postcopy it should fail now, nice and
|
|
* early.
|
|
*/
|
|
qemu_savevm_send_postcopy_advise(s->to_dst_file);
|
|
}
|
|
|
|
qemu_savevm_state_begin(s->to_dst_file, &s->params);
|
|
|
|
s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
|
|
current_active_state = MIGRATION_STATUS_ACTIVE;
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_ACTIVE);
|
|
|
|
trace_migration_thread_setup_complete();
|
|
|
|
while (s->state == MIGRATION_STATUS_ACTIVE ||
|
|
s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
|
|
int64_t current_time;
|
|
uint64_t pending_size;
|
|
|
|
if (!qemu_file_rate_limit(s->to_dst_file)) {
|
|
uint64_t pend_post, pend_nonpost;
|
|
|
|
qemu_savevm_state_pending(s->to_dst_file, max_size, &pend_nonpost,
|
|
&pend_post);
|
|
pending_size = pend_nonpost + pend_post;
|
|
trace_migrate_pending(pending_size, max_size,
|
|
pend_post, pend_nonpost);
|
|
if (pending_size && pending_size >= max_size) {
|
|
/* Still a significant amount to transfer */
|
|
|
|
if (migrate_postcopy_ram() &&
|
|
s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE &&
|
|
pend_nonpost <= max_size &&
|
|
atomic_read(&s->start_postcopy)) {
|
|
|
|
if (!postcopy_start(s, &old_vm_running)) {
|
|
current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE;
|
|
entered_postcopy = true;
|
|
}
|
|
|
|
continue;
|
|
}
|
|
/* Just another iteration step */
|
|
qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy);
|
|
} else {
|
|
trace_migration_thread_low_pending(pending_size);
|
|
migration_completion(s, current_active_state,
|
|
&old_vm_running, &start_time);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (qemu_file_get_error(s->to_dst_file)) {
|
|
migrate_set_state(&s->state, current_active_state,
|
|
MIGRATION_STATUS_FAILED);
|
|
trace_migration_thread_file_err();
|
|
break;
|
|
}
|
|
current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
if (current_time >= initial_time + BUFFER_DELAY) {
|
|
uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) -
|
|
initial_bytes;
|
|
uint64_t time_spent = current_time - initial_time;
|
|
double bandwidth = (double)transferred_bytes / time_spent;
|
|
max_size = bandwidth * migrate_max_downtime() / 1000000;
|
|
|
|
s->mbps = (((double) transferred_bytes * 8.0) /
|
|
((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
|
|
|
|
trace_migrate_transferred(transferred_bytes, time_spent,
|
|
bandwidth, max_size);
|
|
/* if we haven't sent anything, we don't want to recalculate
|
|
10000 is a small enough number for our purposes */
|
|
if (s->dirty_bytes_rate && transferred_bytes > 10000) {
|
|
s->expected_downtime = s->dirty_bytes_rate / bandwidth;
|
|
}
|
|
|
|
qemu_file_reset_rate_limit(s->to_dst_file);
|
|
initial_time = current_time;
|
|
initial_bytes = qemu_ftell(s->to_dst_file);
|
|
}
|
|
if (qemu_file_rate_limit(s->to_dst_file)) {
|
|
/* usleep expects microseconds */
|
|
g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
|
|
}
|
|
}
|
|
|
|
trace_migration_thread_after_loop();
|
|
/* If we enabled cpu throttling for auto-converge, turn it off. */
|
|
cpu_throttle_stop();
|
|
end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
|
|
|
|
qemu_mutex_lock_iothread();
|
|
qemu_savevm_state_cleanup();
|
|
if (s->state == MIGRATION_STATUS_COMPLETED) {
|
|
uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
|
|
s->total_time = end_time - s->total_time;
|
|
if (!entered_postcopy) {
|
|
s->downtime = end_time - start_time;
|
|
}
|
|
if (s->total_time) {
|
|
s->mbps = (((double) transferred_bytes * 8.0) /
|
|
((double) s->total_time)) / 1000;
|
|
}
|
|
runstate_set(RUN_STATE_POSTMIGRATE);
|
|
} else {
|
|
if (old_vm_running && !entered_postcopy) {
|
|
vm_start();
|
|
}
|
|
}
|
|
qemu_bh_schedule(s->cleanup_bh);
|
|
qemu_mutex_unlock_iothread();
|
|
|
|
rcu_unregister_thread();
|
|
return NULL;
|
|
}
|
|
|
|
void migrate_fd_connect(MigrationState *s)
|
|
{
|
|
/* This is a best 1st approximation. ns to ms */
|
|
s->expected_downtime = max_downtime/1000000;
|
|
s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
|
|
|
|
qemu_file_set_rate_limit(s->to_dst_file,
|
|
s->bandwidth_limit / XFER_LIMIT_RATIO);
|
|
|
|
/* Notify before starting migration thread */
|
|
notifier_list_notify(&migration_state_notifiers, s);
|
|
|
|
/*
|
|
* Open the return path; currently for postcopy but other things might
|
|
* also want it.
|
|
*/
|
|
if (migrate_postcopy_ram()) {
|
|
if (open_return_path_on_source(s)) {
|
|
error_report("Unable to open return-path for postcopy");
|
|
migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
|
|
MIGRATION_STATUS_FAILED);
|
|
migrate_fd_cleanup(s);
|
|
return;
|
|
}
|
|
}
|
|
|
|
migrate_compress_threads_create();
|
|
qemu_thread_create(&s->thread, "migration", migration_thread, s,
|
|
QEMU_THREAD_JOINABLE);
|
|
s->migration_thread_running = true;
|
|
}
|
|
|
|
PostcopyState postcopy_state_get(void)
|
|
{
|
|
return atomic_mb_read(&incoming_postcopy_state);
|
|
}
|
|
|
|
/* Set the state and return the old state */
|
|
PostcopyState postcopy_state_set(PostcopyState new_state)
|
|
{
|
|
return atomic_xchg(&incoming_postcopy_state, new_state);
|
|
}
|
|
|