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/*
* Multifd device state migration
*
* Copyright (C) 2024,2025 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/lockable.h"
#include "block/thread-pool.h"
#include "migration.h"
#include "migration/misc.h"
#include "multifd.h"
#include "options.h"
static struct {
QemuMutex queue_job_mutex;
MultiFDSendData *send_data;
ThreadPool *threads;
bool threads_abort;
} *multifd_send_device_state;
void multifd_device_state_send_setup(void)
{
assert(!multifd_send_device_state);
multifd_send_device_state = g_malloc(sizeof(*multifd_send_device_state));
qemu_mutex_init(&multifd_send_device_state->queue_job_mutex);
multifd_send_device_state->send_data = multifd_send_data_alloc();
multifd_send_device_state->threads = thread_pool_new();
multifd_send_device_state->threads_abort = false;
}
void multifd_device_state_send_cleanup(void)
{
g_clear_pointer(&multifd_send_device_state->threads, thread_pool_free);
g_clear_pointer(&multifd_send_device_state->send_data,
multifd_send_data_free);
qemu_mutex_destroy(&multifd_send_device_state->queue_job_mutex);
g_clear_pointer(&multifd_send_device_state, g_free);
}
void multifd_send_data_clear_device_state(MultiFDDeviceState_t *device_state)
{
g_clear_pointer(&device_state->idstr, g_free);
g_clear_pointer(&device_state->buf, g_free);
}
static void multifd_device_state_fill_packet(MultiFDSendParams *p)
{
MultiFDDeviceState_t *device_state = &p->data->u.device_state;
MultiFDPacketDeviceState_t *packet = p->packet_device_state;
packet->hdr.flags = cpu_to_be32(p->flags);
strncpy(packet->idstr, device_state->idstr, sizeof(packet->idstr) - 1);
packet->idstr[sizeof(packet->idstr) - 1] = 0;
packet->instance_id = cpu_to_be32(device_state->instance_id);
packet->next_packet_size = cpu_to_be32(p->next_packet_size);
}
static void multifd_prepare_header_device_state(MultiFDSendParams *p)
{
p->iov[0].iov_len = sizeof(*p->packet_device_state);
p->iov[0].iov_base = p->packet_device_state;
p->iovs_num++;
}
void multifd_device_state_send_prepare(MultiFDSendParams *p)
{
MultiFDDeviceState_t *device_state = &p->data->u.device_state;
assert(multifd_payload_device_state(p->data));
multifd_prepare_header_device_state(p);
assert(!(p->flags & MULTIFD_FLAG_SYNC));
p->next_packet_size = device_state->buf_len;
if (p->next_packet_size > 0) {
p->iov[p->iovs_num].iov_base = device_state->buf;
p->iov[p->iovs_num].iov_len = p->next_packet_size;
p->iovs_num++;
}
p->flags |= MULTIFD_FLAG_NOCOMP | MULTIFD_FLAG_DEVICE_STATE;
multifd_device_state_fill_packet(p);
}
bool multifd_queue_device_state(char *idstr, uint32_t instance_id,
char *data, size_t len)
{
/* Device state submissions can come from multiple threads */
QEMU_LOCK_GUARD(&multifd_send_device_state->queue_job_mutex);
MultiFDDeviceState_t *device_state;
assert(multifd_payload_empty(multifd_send_device_state->send_data));
multifd_set_payload_type(multifd_send_device_state->send_data,
MULTIFD_PAYLOAD_DEVICE_STATE);
device_state = &multifd_send_device_state->send_data->u.device_state;
device_state->idstr = g_strdup(idstr);
device_state->instance_id = instance_id;
device_state->buf = g_memdup2(data, len);
device_state->buf_len = len;
if (!multifd_send(&multifd_send_device_state->send_data)) {
multifd_send_data_clear(multifd_send_device_state->send_data);
return false;
}
return true;
}
bool multifd_device_state_supported(void)
{
return migrate_multifd() && !migrate_mapped_ram() &&
migrate_multifd_compression() == MULTIFD_COMPRESSION_NONE;
}
static void multifd_device_state_save_thread_data_free(void *opaque)
{
SaveLiveCompletePrecopyThreadData *data = opaque;
g_clear_pointer(&data->idstr, g_free);
g_free(data);
}
static int multifd_device_state_save_thread(void *opaque)
{
SaveLiveCompletePrecopyThreadData *data = opaque;
g_autoptr(Error) local_err = NULL;
if (!data->hdlr(data, &local_err)) {
MigrationState *s = migrate_get_current();
/*
* Can't call abort_device_state_save_threads() here since new
* save threads could still be in process of being launched
* (if, for example, the very first save thread launched exited
* with an error very quickly).
*/
assert(local_err);
/*
* In case of multiple save threads failing which thread error
* return we end setting is purely arbitrary.
*/
migrate_set_error(s, local_err);
}
return 0;
}
bool multifd_device_state_save_thread_should_exit(void)
{
return qatomic_read(&multifd_send_device_state->threads_abort);
}
void
multifd_spawn_device_state_save_thread(SaveLiveCompletePrecopyThreadHandler hdlr,
char *idstr, uint32_t instance_id,
void *opaque)
{
SaveLiveCompletePrecopyThreadData *data;
assert(multifd_device_state_supported());
assert(multifd_send_device_state);
assert(!qatomic_read(&multifd_send_device_state->threads_abort));
data = g_new(SaveLiveCompletePrecopyThreadData, 1);
data->hdlr = hdlr;
data->idstr = g_strdup(idstr);
data->instance_id = instance_id;
data->handler_opaque = opaque;
thread_pool_submit_immediate(multifd_send_device_state->threads,
multifd_device_state_save_thread,
data,
multifd_device_state_save_thread_data_free);
}
void multifd_abort_device_state_save_threads(void)
{
assert(multifd_device_state_supported());
qatomic_set(&multifd_send_device_state->threads_abort, true);
}
bool multifd_join_device_state_save_threads(void)
{
MigrationState *s = migrate_get_current();
assert(multifd_device_state_supported());
thread_pool_wait(multifd_send_device_state->threads);
return !migrate_has_error(s);
}
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