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qemu-e2k/hw/vfio/migration.c

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/*
* Migration support for VFIO devices
*
* Copyright NVIDIA, Inc. 2020
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "qemu/cutils.h"
#include <linux/vfio.h>
#include <sys/ioctl.h>
#include "sysemu/runstate.h"
#include "hw/vfio/vfio-common.h"
#include "migration/migration.h"
#include "migration/vmstate.h"
#include "migration/qemu-file.h"
#include "migration/register.h"
#include "migration/blocker.h"
#include "migration/misc.h"
#include "qapi/error.h"
#include "exec/ramlist.h"
#include "exec/ram_addr.h"
#include "pci.h"
#include "trace.h"
#include "hw/hw.h"
/*
* Flags to be used as unique delimiters for VFIO devices in the migration
* stream. These flags are composed as:
* 0xffffffff => MSB 32-bit all 1s
* 0xef10 => Magic ID, represents emulated (virtual) function IO
* 0x0000 => 16-bits reserved for flags
*
* The beginning of state information is marked by _DEV_CONFIG_STATE,
* _DEV_SETUP_STATE, or _DEV_DATA_STATE, respectively. The end of a
* certain state information is marked by _END_OF_STATE.
*/
#define VFIO_MIG_FLAG_END_OF_STATE (0xffffffffef100001ULL)
#define VFIO_MIG_FLAG_DEV_CONFIG_STATE (0xffffffffef100002ULL)
#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL)
#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL)
static int64_t bytes_transferred;
static inline int vfio_mig_access(VFIODevice *vbasedev, void *val, int count,
off_t off, bool iswrite)
{
int ret;
ret = iswrite ? pwrite(vbasedev->fd, val, count, off) :
pread(vbasedev->fd, val, count, off);
if (ret < count) {
error_report("vfio_mig_%s %d byte %s: failed at offset 0x%"
HWADDR_PRIx", err: %s", iswrite ? "write" : "read", count,
vbasedev->name, off, strerror(errno));
return (ret < 0) ? ret : -EINVAL;
}
return 0;
}
static int vfio_mig_rw(VFIODevice *vbasedev, __u8 *buf, size_t count,
off_t off, bool iswrite)
{
int ret, done = 0;
__u8 *tbuf = buf;
while (count) {
int bytes = 0;
if (count >= 8 && !(off % 8)) {
bytes = 8;
} else if (count >= 4 && !(off % 4)) {
bytes = 4;
} else if (count >= 2 && !(off % 2)) {
bytes = 2;
} else {
bytes = 1;
}
ret = vfio_mig_access(vbasedev, tbuf, bytes, off, iswrite);
if (ret) {
return ret;
}
count -= bytes;
done += bytes;
off += bytes;
tbuf += bytes;
}
return done;
}
#define vfio_mig_read(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, false)
#define vfio_mig_write(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, true)
#define VFIO_MIG_STRUCT_OFFSET(f) \
offsetof(struct vfio_device_migration_info, f)
/*
* Change the device_state register for device @vbasedev. Bits set in @mask
* are preserved, bits set in @value are set, and bits not set in either @mask
* or @value are cleared in device_state. If the register cannot be accessed,
* the resulting state would be invalid, or the device enters an error state,
* an error is returned.
*/
static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t mask,
uint32_t value)
{
VFIOMigration *migration = vbasedev->migration;
VFIORegion *region = &migration->region;
off_t dev_state_off = region->fd_offset +
VFIO_MIG_STRUCT_OFFSET(device_state);
uint32_t device_state;
int ret;
ret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
dev_state_off);
if (ret < 0) {
return ret;
}
device_state = (device_state & mask) | value;
if (!VFIO_DEVICE_STATE_VALID(device_state)) {
return -EINVAL;
}
ret = vfio_mig_write(vbasedev, &device_state, sizeof(device_state),
dev_state_off);
if (ret < 0) {
int rret;
rret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
dev_state_off);
if ((rret < 0) || (VFIO_DEVICE_STATE_IS_ERROR(device_state))) {
hw_error("%s: Device in error state 0x%x", vbasedev->name,
device_state);
return rret ? rret : -EIO;
}
return ret;
}
migration->device_state = device_state;
trace_vfio_migration_set_state(vbasedev->name, device_state);
return 0;
}
static void *get_data_section_size(VFIORegion *region, uint64_t data_offset,
uint64_t data_size, uint64_t *size)
{
void *ptr = NULL;
uint64_t limit = 0;
int i;
if (!region->mmaps) {
if (size) {
*size = MIN(data_size, region->size - data_offset);
}
return ptr;
}
for (i = 0; i < region->nr_mmaps; i++) {
VFIOMmap *map = region->mmaps + i;
if ((data_offset >= map->offset) &&
(data_offset < map->offset + map->size)) {
/* check if data_offset is within sparse mmap areas */
ptr = map->mmap + data_offset - map->offset;
if (size) {
*size = MIN(data_size, map->offset + map->size - data_offset);
}
break;
} else if ((data_offset < map->offset) &&
(!limit || limit > map->offset)) {
/*
* data_offset is not within sparse mmap areas, find size of
* non-mapped area. Check through all list since region->mmaps list
* is not sorted.
*/
limit = map->offset;
}
}
if (!ptr && size) {
*size = limit ? MIN(data_size, limit - data_offset) : data_size;
}
return ptr;
}
static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev, uint64_t *size)
{
VFIOMigration *migration = vbasedev->migration;
VFIORegion *region = &migration->region;
uint64_t data_offset = 0, data_size = 0, sz;
int ret;
ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset));
if (ret < 0) {
return ret;
}
ret = vfio_mig_read(vbasedev, &data_size, sizeof(data_size),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size));
if (ret < 0) {
return ret;
}
trace_vfio_save_buffer(vbasedev->name, data_offset, data_size,
migration->pending_bytes);
qemu_put_be64(f, data_size);
sz = data_size;
while (sz) {
void *buf;
uint64_t sec_size;
bool buf_allocated = false;
buf = get_data_section_size(region, data_offset, sz, &sec_size);
if (!buf) {
buf = g_try_malloc(sec_size);
if (!buf) {
error_report("%s: Error allocating buffer ", __func__);
return -ENOMEM;
}
buf_allocated = true;
ret = vfio_mig_read(vbasedev, buf, sec_size,
region->fd_offset + data_offset);
if (ret < 0) {
g_free(buf);
return ret;
}
}
qemu_put_buffer(f, buf, sec_size);
if (buf_allocated) {
g_free(buf);
}
sz -= sec_size;
data_offset += sec_size;
}
ret = qemu_file_get_error(f);
if (!ret && size) {
*size = data_size;
}
bytes_transferred += data_size;
return ret;
}
static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev,
uint64_t data_size)
{
VFIORegion *region = &vbasedev->migration->region;
uint64_t data_offset = 0, size, report_size;
int ret;
do {
ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset));
if (ret < 0) {
return ret;
}
if (data_offset + data_size > region->size) {
/*
* If data_size is greater than the data section of migration region
* then iterate the write buffer operation. This case can occur if
* size of migration region at destination is smaller than size of
* migration region at source.
*/
report_size = size = region->size - data_offset;
data_size -= size;
} else {
report_size = size = data_size;
data_size = 0;
}
trace_vfio_load_state_device_data(vbasedev->name, data_offset, size);
while (size) {
void *buf;
uint64_t sec_size;
bool buf_alloc = false;
buf = get_data_section_size(region, data_offset, size, &sec_size);
if (!buf) {
buf = g_try_malloc(sec_size);
if (!buf) {
error_report("%s: Error allocating buffer ", __func__);
return -ENOMEM;
}
buf_alloc = true;
}
qemu_get_buffer(f, buf, sec_size);
if (buf_alloc) {
ret = vfio_mig_write(vbasedev, buf, sec_size,
region->fd_offset + data_offset);
g_free(buf);
if (ret < 0) {
return ret;
}
}
size -= sec_size;
data_offset += sec_size;
}
ret = vfio_mig_write(vbasedev, &report_size, sizeof(report_size),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size));
if (ret < 0) {
return ret;
}
} while (data_size);
return 0;
}
static int vfio_update_pending(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
VFIORegion *region = &migration->region;
uint64_t pending_bytes = 0;
int ret;
ret = vfio_mig_read(vbasedev, &pending_bytes, sizeof(pending_bytes),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(pending_bytes));
if (ret < 0) {
migration->pending_bytes = 0;
return ret;
}
migration->pending_bytes = pending_bytes;
trace_vfio_update_pending(vbasedev->name, pending_bytes);
return 0;
}
static int vfio_save_device_config_state(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_CONFIG_STATE);
if (vbasedev->ops && vbasedev->ops->vfio_save_config) {
vbasedev->ops->vfio_save_config(vbasedev, f);
}
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
trace_vfio_save_device_config_state(vbasedev->name);
return qemu_file_get_error(f);
}
static int vfio_load_device_config_state(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
uint64_t data;
if (vbasedev->ops && vbasedev->ops->vfio_load_config) {
int ret;
ret = vbasedev->ops->vfio_load_config(vbasedev, f);
if (ret) {
error_report("%s: Failed to load device config space",
vbasedev->name);
return ret;
}
}
data = qemu_get_be64(f);
if (data != VFIO_MIG_FLAG_END_OF_STATE) {
error_report("%s: Failed loading device config space, "
"end flag incorrect 0x%"PRIx64, vbasedev->name, data);
return -EINVAL;
}
trace_vfio_load_device_config_state(vbasedev->name);
return qemu_file_get_error(f);
}
static void vfio_migration_cleanup(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
if (migration->region.mmaps) {
vfio_region_unmap(&migration->region);
}
}
/* ---------------------------------------------------------------------- */
static int vfio_save_setup(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
int ret;
trace_vfio_save_setup(vbasedev->name);
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE);
if (migration->region.mmaps) {
/*
* Calling vfio_region_mmap() from migration thread. Memory API called
* from this function require locking the iothread when called from
* outside the main loop thread.
*/
qemu_mutex_lock_iothread();
ret = vfio_region_mmap(&migration->region);
qemu_mutex_unlock_iothread();
if (ret) {
error_report("%s: Failed to mmap VFIO migration region: %s",
vbasedev->name, strerror(-ret));
error_report("%s: Falling back to slow path", vbasedev->name);
}
}
ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_MASK,
VFIO_DEVICE_STATE_V1_SAVING);
if (ret) {
error_report("%s: Failed to set state SAVING", vbasedev->name);
return ret;
}
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
return 0;
}
static void vfio_save_cleanup(void *opaque)
{
VFIODevice *vbasedev = opaque;
vfio_migration_cleanup(vbasedev);
trace_vfio_save_cleanup(vbasedev->name);
}
static void vfio_save_pending(QEMUFile *f, void *opaque,
uint64_t threshold_size,
uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
int ret;
ret = vfio_update_pending(vbasedev);
if (ret) {
return;
}
*res_precopy_only += migration->pending_bytes;
trace_vfio_save_pending(vbasedev->name, *res_precopy_only,
*res_postcopy_only, *res_compatible);
}
static int vfio_save_iterate(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
uint64_t data_size;
int ret;
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE);
if (migration->pending_bytes == 0) {
ret = vfio_update_pending(vbasedev);
if (ret) {
return ret;
}
if (migration->pending_bytes == 0) {
qemu_put_be64(f, 0);
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
/* indicates data finished, goto complete phase */
return 1;
}
}
ret = vfio_save_buffer(f, vbasedev, &data_size);
if (ret) {
error_report("%s: vfio_save_buffer failed %s", vbasedev->name,
strerror(errno));
return ret;
}
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
/*
* Reset pending_bytes as .save_live_pending is not called during savevm or
* snapshot case, in such case vfio_update_pending() at the start of this
* function updates pending_bytes.
*/
migration->pending_bytes = 0;
trace_vfio_save_iterate(vbasedev->name, data_size);
return 0;
}
static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
uint64_t data_size;
int ret;
ret = vfio_migration_set_state(vbasedev, ~VFIO_DEVICE_STATE_V1_RUNNING,
VFIO_DEVICE_STATE_V1_SAVING);
if (ret) {
error_report("%s: Failed to set state STOP and SAVING",
vbasedev->name);
return ret;
}
ret = vfio_update_pending(vbasedev);
if (ret) {
return ret;
}
while (migration->pending_bytes > 0) {
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE);
ret = vfio_save_buffer(f, vbasedev, &data_size);
if (ret < 0) {
error_report("%s: Failed to save buffer", vbasedev->name);
return ret;
}
if (data_size == 0) {
break;
}
ret = vfio_update_pending(vbasedev);
if (ret) {
return ret;
}
}
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
ret = vfio_migration_set_state(vbasedev, ~VFIO_DEVICE_STATE_V1_SAVING, 0);
if (ret) {
error_report("%s: Failed to set state STOPPED", vbasedev->name);
return ret;
}
trace_vfio_save_complete_precopy(vbasedev->name);
return ret;
}
static void vfio_save_state(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
int ret;
ret = vfio_save_device_config_state(f, opaque);
if (ret) {
error_report("%s: Failed to save device config space",
vbasedev->name);
qemu_file_set_error(f, ret);
}
}
static int vfio_load_setup(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
int ret = 0;
if (migration->region.mmaps) {
ret = vfio_region_mmap(&migration->region);
if (ret) {
error_report("%s: Failed to mmap VFIO migration region %d: %s",
vbasedev->name, migration->region.nr,
strerror(-ret));
error_report("%s: Falling back to slow path", vbasedev->name);
}
}
ret = vfio_migration_set_state(vbasedev, ~VFIO_DEVICE_STATE_MASK,
VFIO_DEVICE_STATE_V1_RESUMING);
if (ret) {
error_report("%s: Failed to set state RESUMING", vbasedev->name);
if (migration->region.mmaps) {
vfio_region_unmap(&migration->region);
}
}
return ret;
}
static int vfio_load_cleanup(void *opaque)
{
VFIODevice *vbasedev = opaque;
vfio_migration_cleanup(vbasedev);
trace_vfio_load_cleanup(vbasedev->name);
return 0;
}
static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
{
VFIODevice *vbasedev = opaque;
int ret = 0;
uint64_t data;
data = qemu_get_be64(f);
while (data != VFIO_MIG_FLAG_END_OF_STATE) {
trace_vfio_load_state(vbasedev->name, data);
switch (data) {
case VFIO_MIG_FLAG_DEV_CONFIG_STATE:
{
return vfio_load_device_config_state(f, opaque);
}
case VFIO_MIG_FLAG_DEV_SETUP_STATE:
{
data = qemu_get_be64(f);
if (data == VFIO_MIG_FLAG_END_OF_STATE) {
return ret;
} else {
error_report("%s: SETUP STATE: EOS not found 0x%"PRIx64,
vbasedev->name, data);
return -EINVAL;
}
break;
}
case VFIO_MIG_FLAG_DEV_DATA_STATE:
{
uint64_t data_size = qemu_get_be64(f);
if (data_size) {
ret = vfio_load_buffer(f, vbasedev, data_size);
if (ret < 0) {
return ret;
}
}
break;
}
default:
error_report("%s: Unknown tag 0x%"PRIx64, vbasedev->name, data);
return -EINVAL;
}
data = qemu_get_be64(f);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
}
return ret;
}
static SaveVMHandlers savevm_vfio_handlers = {
.save_setup = vfio_save_setup,
.save_cleanup = vfio_save_cleanup,
.save_live_pending = vfio_save_pending,
.save_live_iterate = vfio_save_iterate,
.save_live_complete_precopy = vfio_save_complete_precopy,
.save_state = vfio_save_state,
.load_setup = vfio_load_setup,
.load_cleanup = vfio_load_cleanup,
.load_state = vfio_load_state,
};
/* ---------------------------------------------------------------------- */
static void vfio_vmstate_change(void *opaque, bool running, RunState state)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
uint32_t value, mask;
int ret;
if (vbasedev->migration->vm_running == running) {
return;
}
if (running) {
/*
* Here device state can have one of _SAVING, _RESUMING or _STOP bit.
* Transition from _SAVING to _RUNNING can happen if there is migration
* failure, in that case clear _SAVING bit.
* Transition from _RESUMING to _RUNNING occurs during resuming
* phase, in that case clear _RESUMING bit.
* In both the above cases, set _RUNNING bit.
*/
mask = ~VFIO_DEVICE_STATE_MASK;
value = VFIO_DEVICE_STATE_V1_RUNNING;
} else {
/*
* Here device state could be either _RUNNING or _SAVING|_RUNNING. Reset
* _RUNNING bit
*/
mask = ~VFIO_DEVICE_STATE_V1_RUNNING;
/*
* When VM state transition to stop for savevm command, device should
* start saving data.
*/
if (state == RUN_STATE_SAVE_VM) {
value = VFIO_DEVICE_STATE_V1_SAVING;
} else {
value = 0;
}
}
ret = vfio_migration_set_state(vbasedev, mask, value);
if (ret) {
/*
* Migration should be aborted in this case, but vm_state_notify()
* currently does not support reporting failures.
*/
error_report("%s: Failed to set device state 0x%x", vbasedev->name,
(migration->device_state & mask) | value);
qemu_file_set_error(migrate_get_current()->to_dst_file, ret);
}
vbasedev->migration->vm_running = running;
trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state),
(migration->device_state & mask) | value);
}
static void vfio_migration_state_notifier(Notifier *notifier, void *data)
{
MigrationState *s = data;
VFIOMigration *migration = container_of(notifier, VFIOMigration,
migration_state);
VFIODevice *vbasedev = migration->vbasedev;
int ret;
trace_vfio_migration_state_notifier(vbasedev->name,
MigrationStatus_str(s->state));
switch (s->state) {
case MIGRATION_STATUS_CANCELLING:
case MIGRATION_STATUS_CANCELLED:
case MIGRATION_STATUS_FAILED:
bytes_transferred = 0;
ret = vfio_migration_set_state(vbasedev,
~(VFIO_DEVICE_STATE_V1_SAVING |
VFIO_DEVICE_STATE_V1_RESUMING),
VFIO_DEVICE_STATE_V1_RUNNING);
if (ret) {
error_report("%s: Failed to set state RUNNING", vbasedev->name);
}
}
}
static void vfio_migration_exit(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
vfio_region_exit(&migration->region);
vfio_region_finalize(&migration->region);
g_free(vbasedev->migration);
vbasedev->migration = NULL;
}
static int vfio_migration_init(VFIODevice *vbasedev,
struct vfio_region_info *info)
{
int ret;
Object *obj;
VFIOMigration *migration;
char id[256] = "";
g_autofree char *path = NULL, *oid = NULL;
if (!vbasedev->ops->vfio_get_object) {
return -EINVAL;
}
obj = vbasedev->ops->vfio_get_object(vbasedev);
if (!obj) {
return -EINVAL;
}
vbasedev->migration = g_new0(VFIOMigration, 1);
ret = vfio_region_setup(obj, vbasedev, &vbasedev->migration->region,
info->index, "migration");
if (ret) {
error_report("%s: Failed to setup VFIO migration region %d: %s",
vbasedev->name, info->index, strerror(-ret));
goto err;
}
if (!vbasedev->migration->region.size) {
error_report("%s: Invalid zero-sized VFIO migration region %d",
vbasedev->name, info->index);
ret = -EINVAL;
goto err;
}
migration = vbasedev->migration;
migration->vbasedev = vbasedev;
oid = vmstate_if_get_id(VMSTATE_IF(DEVICE(obj)));
if (oid) {
path = g_strdup_printf("%s/vfio", oid);
} else {
path = g_strdup("vfio");
}
strpadcpy(id, sizeof(id), path, '\0');
register_savevm_live(id, VMSTATE_INSTANCE_ID_ANY, 1, &savevm_vfio_handlers,
vbasedev);
migration->vm_state = qdev_add_vm_change_state_handler(vbasedev->dev,
vfio_vmstate_change,
vbasedev);
migration->migration_state.notify = vfio_migration_state_notifier;
add_migration_state_change_notifier(&migration->migration_state);
return 0;
err:
vfio_migration_exit(vbasedev);
return ret;
}
/* ---------------------------------------------------------------------- */
int64_t vfio_mig_bytes_transferred(void)
{
return bytes_transferred;
}
int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
{
VFIOContainer *container = vbasedev->group->container;
struct vfio_region_info *info = NULL;
int ret = -ENOTSUP;
if (!vbasedev->enable_migration || !container->dirty_pages_supported) {
goto add_blocker;
}
ret = vfio_get_dev_region_info(vbasedev,
VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
&info);
if (ret) {
goto add_blocker;
}
ret = vfio_migration_init(vbasedev, info);
if (ret) {
goto add_blocker;
}
trace_vfio_migration_probe(vbasedev->name, info->index);
g_free(info);
return 0;
add_blocker:
error_setg(&vbasedev->migration_blocker,
"VFIO device doesn't support migration");
g_free(info);
ret = migrate_add_blocker(vbasedev->migration_blocker, errp);
if (ret < 0) {
error_free(vbasedev->migration_blocker);
vbasedev->migration_blocker = NULL;
}
return ret;
}
void vfio_migration_finalize(VFIODevice *vbasedev)
{
if (vbasedev->migration) {
VFIOMigration *migration = vbasedev->migration;
remove_migration_state_change_notifier(&migration->migration_state);
qemu_del_vm_change_state_handler(migration->vm_state);
unregister_savevm(VMSTATE_IF(vbasedev->dev), "vfio", vbasedev);
vfio_migration_exit(vbasedev);
}
if (vbasedev->migration_blocker) {
migrate_del_blocker(vbasedev->migration_blocker);
error_free(vbasedev->migration_blocker);
vbasedev->migration_blocker = NULL;
}
}
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