@@ -66,6 +66,11 @@ typedef struct VFIOMigration {
int vm_running;
Notifier migration_state;
uint64_t pending_bytes;
+ uint32_t device_state;
+ int data_fd;
+ void *data_buffer;
+ size_t data_buffer_size;
+ bool v2;
} VFIOMigration;
typedef struct VFIOAddressSpace {
@@ -408,10 +408,17 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
return false;
}
- if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF) &&
+ if (!migration->v2 &&
+ (vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF) &&
(migration->device_state_v1 & VFIO_DEVICE_STATE_V1_RUNNING)) {
return false;
}
+
+ if (migration->v2 &&
+ vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF &&
+ migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
+ return false;
+ }
}
}
return true;
@@ -438,7 +445,13 @@ static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
return false;
}
- if (migration->device_state_v1 & VFIO_DEVICE_STATE_V1_RUNNING) {
+ if (!migration->v2 &&
+ migration->device_state_v1 & VFIO_DEVICE_STATE_V1_RUNNING) {
+ continue;
+ }
+
+ if (migration->v2 &&
+ migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
continue;
} else {
return false;
@@ -10,6 +10,7 @@
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "qemu/cutils.h"
+#include "qemu/units.h"
#include <linux/vfio.h>
#include <sys/ioctl.h>
@@ -44,8 +45,114 @@
#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL)
#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL)
+/*
+ * This is an arbitrary size based on migration of mlx5 devices, where typically
+ * total device migration size is on the order of 100s of MB. Testing with
+ * larger values, e.g. 128MB and 1GB, did not show a performance improvement.
+ */
+#define VFIO_MIG_DEFAULT_DATA_BUFFER_SIZE (1 * MiB)
+
static int64_t bytes_transferred;
+static const char *mig_state_to_str(enum vfio_device_mig_state state)
+{
+ switch (state) {
+ case VFIO_DEVICE_STATE_ERROR:
+ return "ERROR";
+ case VFIO_DEVICE_STATE_STOP:
+ return "STOP";
+ case VFIO_DEVICE_STATE_RUNNING:
+ return "RUNNING";
+ case VFIO_DEVICE_STATE_STOP_COPY:
+ return "STOP_COPY";
+ case VFIO_DEVICE_STATE_RESUMING:
+ return "RESUMING";
+ default:
+ return "UNKNOWN STATE";
+ }
+}
+
+static int vfio_migration_set_state(VFIODevice *vbasedev,
+ enum vfio_device_mig_state new_state,
+ enum vfio_device_mig_state recover_state)
+{
+ VFIOMigration *migration = vbasedev->migration;
+ uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
+ sizeof(struct vfio_device_feature_mig_state),
+ sizeof(uint64_t))] = {};
+ struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+ struct vfio_device_feature_mig_state *mig_state =
+ (struct vfio_device_feature_mig_state *)feature->data;
+ int ret;
+
+ feature->argsz = sizeof(buf);
+ feature->flags =
+ VFIO_DEVICE_FEATURE_SET | VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE;
+ mig_state->device_state = new_state;
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ /* Try to set the device in some good state */
+ ret = -errno;
+
+ if (recover_state == VFIO_DEVICE_STATE_ERROR) {
+ error_report("%s: Failed setting device state to %s, err: %s. "
+ "Recover state is ERROR. Resetting device",
+ vbasedev->name, mig_state_to_str(new_state),
+ strerror(errno));
+
+ goto reset_device;
+ }
+
+ error_report(
+ "%s: Failed setting device state to %s, err: %s. Setting device in recover state %s",
+ vbasedev->name, mig_state_to_str(new_state),
+ strerror(errno), mig_state_to_str(recover_state));
+
+ mig_state->device_state = recover_state;
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ ret = -errno;
+ error_report(
+ "%s: Failed setting device in recover state, err: %s. Resetting device",
+ vbasedev->name, strerror(errno));
+
+ goto reset_device;
+ }
+
+ migration->device_state = recover_state;
+
+ return ret;
+ }
+
+ migration->device_state = new_state;
+ if (mig_state->data_fd != -1) {
+ if (migration->data_fd != -1) {
+ /*
+ * This can happen if the device is asynchronously reset and
+ * terminates a data transfer.
+ */
+ error_report("%s: data_fd out of sync", vbasedev->name);
+ close(mig_state->data_fd);
+
+ return -EBADF;
+ }
+
+ migration->data_fd = mig_state->data_fd;
+ }
+
+ trace_vfio_migration_set_state(vbasedev->name, mig_state_to_str(new_state));
+
+ return 0;
+
+reset_device:
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_RESET)) {
+ hw_error("%s: Failed resetting device, err: %s", vbasedev->name,
+ strerror(errno));
+ }
+
+ migration->device_state = VFIO_DEVICE_STATE_RUNNING;
+
+ return ret;
+}
+
static inline int vfio_mig_access(VFIODevice *vbasedev, void *val, int count,
off_t off, bool iswrite)
{
@@ -260,6 +367,18 @@ static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev, uint64_t *size)
return ret;
}
+static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev,
+ uint64_t data_size)
+{
+ VFIOMigration *migration = vbasedev->migration;
+ int ret;
+
+ ret = qemu_file_get_to_fd(f, migration->data_fd, data_size);
+ trace_vfio_load_state_device_data(vbasedev->name, data_size, ret);
+
+ return ret;
+}
+
static int vfio_v1_load_buffer(QEMUFile *f, VFIODevice *vbasedev,
uint64_t data_size)
{
@@ -394,6 +513,14 @@ static int vfio_load_device_config_state(QEMUFile *f, void *opaque)
return qemu_file_get_error(f);
}
+static void vfio_migration_cleanup(VFIODevice *vbasedev)
+{
+ VFIOMigration *migration = vbasedev->migration;
+
+ close(migration->data_fd);
+ migration->data_fd = -1;
+}
+
static void vfio_migration_v1_cleanup(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
@@ -403,8 +530,80 @@ static void vfio_migration_v1_cleanup(VFIODevice *vbasedev)
}
}
+static int vfio_query_stop_copy_size(VFIODevice *vbasedev,
+ uint64_t *stop_copy_size)
+{
+ uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
+ sizeof(struct vfio_device_feature_mig_data_size),
+ sizeof(uint64_t))] = {};
+ struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+ struct vfio_device_feature_mig_data_size *mig_data_size =
+ (struct vfio_device_feature_mig_data_size *)feature->data;
+
+ feature->argsz = sizeof(buf);
+ feature->flags =
+ VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_MIG_DATA_SIZE;
+
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ return -errno;
+ }
+
+ *stop_copy_size = mig_data_size->stop_copy_length;
+
+ return 0;
+}
+
+/* Returns 1 if end-of-stream is reached, 0 if more data and -errno if error */
+static int vfio_save_block(QEMUFile *f, VFIOMigration *migration)
+{
+ ssize_t data_size;
+
+ data_size = read(migration->data_fd, migration->data_buffer,
+ migration->data_buffer_size);
+ if (data_size < 0) {
+ return -errno;
+ }
+ if (data_size == 0) {
+ return 1;
+ }
+
+ qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE);
+ qemu_put_be64(f, data_size);
+ qemu_put_buffer(f, migration->data_buffer, data_size);
+ bytes_transferred += data_size;
+
+ trace_vfio_save_block(migration->vbasedev->name, data_size);
+
+ return qemu_file_get_error(f);
+}
+
/* ---------------------------------------------------------------------- */
+static int vfio_save_setup(QEMUFile *f, void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ uint64_t stop_copy_size = VFIO_MIG_DEFAULT_DATA_BUFFER_SIZE;
+
+ qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE);
+
+ vfio_query_stop_copy_size(vbasedev, &stop_copy_size);
+ migration->data_buffer_size = MIN(VFIO_MIG_DEFAULT_DATA_BUFFER_SIZE,
+ stop_copy_size);
+ migration->data_buffer = g_try_malloc0(migration->data_buffer_size);
+ if (!migration->data_buffer) {
+ error_report("%s: Failed to allocate migration data buffer",
+ vbasedev->name);
+ return -ENOMEM;
+ }
+
+ trace_vfio_save_setup(vbasedev->name, migration->data_buffer_size);
+
+ qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
+
+ return qemu_file_get_error(f);
+}
+
static int vfio_v1_save_setup(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
@@ -448,6 +647,17 @@ static int vfio_v1_save_setup(QEMUFile *f, void *opaque)
return 0;
}
+static void vfio_save_cleanup(void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+
+ g_free(migration->data_buffer);
+ migration->data_buffer = NULL;
+ vfio_migration_cleanup(vbasedev);
+ trace_vfio_save_cleanup(vbasedev->name);
+}
+
static void vfio_v1_save_cleanup(void *opaque)
{
VFIODevice *vbasedev = opaque;
@@ -456,6 +666,37 @@ static void vfio_v1_save_cleanup(void *opaque)
trace_vfio_save_cleanup(vbasedev->name);
}
+/*
+ * Migration size of VFIO devices can be as little as a few KBs or as big as
+ * many GBs. This value should be big enough to cover the worst case.
+ */
+#define VFIO_MIG_STOP_COPY_SIZE (100 * GiB)
+
+/*
+ * Only exact function is implemented and not estimate function. The reason is
+ * that during pre-copy phase of migration the estimate function is called
+ * repeatedly while pending RAM size is over the threshold, thus migration
+ * can't converge and querying the VFIO device pending data size is useless.
+ */
+static void vfio_state_pending_exact(void *opaque, uint64_t *res_precopy_only,
+ uint64_t *res_compatible,
+ uint64_t *res_postcopy_only)
+{
+ VFIODevice *vbasedev = opaque;
+ uint64_t stop_copy_size = VFIO_MIG_STOP_COPY_SIZE;
+
+ /*
+ * If getting pending migration size fails, VFIO_MIG_STOP_COPY_SIZE is
+ * reported so downtime limit won't be violated.
+ */
+ vfio_query_stop_copy_size(vbasedev, &stop_copy_size);
+ *res_precopy_only += stop_copy_size;
+
+ trace_vfio_state_pending_exact(vbasedev->name, *res_precopy_only,
+ *res_postcopy_only, *res_compatible,
+ stop_copy_size);
+}
+
static void vfio_v1_state_pending(void *opaque, uint64_t *res_precopy_only,
uint64_t *res_compatible,
uint64_t *res_postcopy_only)
@@ -522,6 +763,42 @@ static int vfio_save_iterate(QEMUFile *f, void *opaque)
return 0;
}
+static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ int ret;
+
+ /* We reach here with device state STOP only */
+ ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP_COPY,
+ VFIO_DEVICE_STATE_STOP);
+ if (ret) {
+ return ret;
+ }
+
+ do {
+ ret = vfio_save_block(f, vbasedev->migration);
+ if (ret < 0) {
+ return ret;
+ }
+ } while (!ret);
+
+ qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ return ret;
+ }
+
+ /*
+ * If setting the device in STOP state fails, the device should be reset.
+ * To do so, use ERROR state as a recover state.
+ */
+ ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP,
+ VFIO_DEVICE_STATE_ERROR);
+ trace_vfio_save_complete_precopy(vbasedev->name, ret);
+
+ return ret;
+}
+
static int vfio_v1_save_complete_precopy(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
@@ -591,6 +868,14 @@ static void vfio_save_state(QEMUFile *f, void *opaque)
}
}
+static int vfio_load_setup(QEMUFile *f, void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+
+ return vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING,
+ vbasedev->migration->device_state);
+}
+
static int vfio_v1_load_setup(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
@@ -618,6 +903,16 @@ static int vfio_v1_load_setup(QEMUFile *f, void *opaque)
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_v1_load_cleanup(void *opaque)
{
VFIODevice *vbasedev = opaque;
@@ -660,7 +955,11 @@ static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
uint64_t data_size = qemu_get_be64(f);
if (data_size) {
- ret = vfio_v1_load_buffer(f, vbasedev, data_size);
+ if (vbasedev->migration->v2) {
+ ret = vfio_load_buffer(f, vbasedev, data_size);
+ } else {
+ ret = vfio_v1_load_buffer(f, vbasedev, data_size);
+ }
if (ret < 0) {
return ret;
}
@@ -681,6 +980,17 @@ static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
return ret;
}
+static const SaveVMHandlers savevm_vfio_handlers = {
+ .save_setup = vfio_save_setup,
+ .save_cleanup = vfio_save_cleanup,
+ .state_pending_exact = vfio_state_pending_exact,
+ .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 SaveVMHandlers savevm_vfio_v1_handlers = {
.save_setup = vfio_v1_save_setup,
.save_cleanup = vfio_v1_save_cleanup,
@@ -696,6 +1006,38 @@ static SaveVMHandlers savevm_vfio_v1_handlers = {
/* ---------------------------------------------------------------------- */
+static void vfio_vmstate_change(void *opaque, bool running, RunState state)
+{
+ VFIODevice *vbasedev = opaque;
+ enum vfio_device_mig_state new_state;
+ int ret;
+
+ if (running) {
+ new_state = VFIO_DEVICE_STATE_RUNNING;
+ } else {
+ new_state = VFIO_DEVICE_STATE_STOP;
+ }
+
+ /*
+ * If setting the device in new_state fails, the device should be reset.
+ * To do so, use ERROR state as a recover state.
+ */
+ ret = vfio_migration_set_state(vbasedev, new_state,
+ VFIO_DEVICE_STATE_ERROR);
+ if (ret) {
+ /*
+ * Migration should be aborted in this case, but vm_state_notify()
+ * currently does not support reporting failures.
+ */
+ if (migrate_get_current()->to_dst_file) {
+ qemu_file_set_error(migrate_get_current()->to_dst_file, ret);
+ }
+ }
+
+ trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state),
+ mig_state_to_str(new_state));
+}
+
static void vfio_v1_vmstate_change(void *opaque, bool running, RunState state)
{
VFIODevice *vbasedev = opaque;
@@ -769,12 +1111,21 @@ static void vfio_migration_state_notifier(Notifier *notifier, void *data)
case MIGRATION_STATUS_CANCELLED:
case MIGRATION_STATUS_FAILED:
bytes_transferred = 0;
- ret = vfio_migration_v1_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);
+ if (migration->v2) {
+ /*
+ * If setting the device in RUNNING state fails, the device should
+ * be reset. To do so, use ERROR state as a recover state.
+ */
+ vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RUNNING,
+ VFIO_DEVICE_STATE_ERROR);
+ } else {
+ ret = vfio_migration_v1_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);
+ }
}
}
}
@@ -783,12 +1134,42 @@ static void vfio_migration_exit(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
- vfio_region_exit(&migration->region);
- vfio_region_finalize(&migration->region);
+ if (!migration->v2) {
+ vfio_region_exit(&migration->region);
+ vfio_region_finalize(&migration->region);
+ }
g_free(vbasedev->migration);
vbasedev->migration = NULL;
}
+static int vfio_migration_query_flags(VFIODevice *vbasedev, uint64_t *mig_flags)
+{
+ uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
+ sizeof(struct vfio_device_feature_migration),
+ sizeof(uint64_t))] = {};
+ struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+ struct vfio_device_feature_migration *mig =
+ (struct vfio_device_feature_migration *)feature->data;
+
+ feature->argsz = sizeof(buf);
+ feature->flags = VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_MIGRATION;
+ if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
+ if (errno == ENOTTY) {
+ error_report("%s: VFIO migration is not supported in kernel",
+ vbasedev->name);
+ } else {
+ error_report("%s: Failed to query VFIO migration support, err: %s",
+ vbasedev->name, strerror(errno));
+ }
+
+ return -errno;
+ }
+
+ *mig_flags = mig->flags;
+
+ return 0;
+}
+
static int vfio_migration_init(VFIODevice *vbasedev)
{
int ret;
@@ -797,6 +1178,7 @@ static int vfio_migration_init(VFIODevice *vbasedev)
char id[256] = "";
g_autofree char *path = NULL, *oid = NULL;
struct vfio_region_info *info;
+ uint64_t mig_flags = 0;
if (!vbasedev->ops->vfio_get_object) {
return -EINVAL;
@@ -807,34 +1189,50 @@ static int vfio_migration_init(VFIODevice *vbasedev)
return -EINVAL;
}
- ret = vfio_get_dev_region_info(vbasedev,
- VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
- VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
- &info);
- if (ret) {
- return ret;
- }
+ ret = vfio_migration_query_flags(vbasedev, &mig_flags);
+ if (!ret) {
+ /* Migration v2 */
+ /* Basic migration functionality must be supported */
+ if (!(mig_flags & VFIO_MIGRATION_STOP_COPY)) {
+ return -EOPNOTSUPP;
+ }
+ vbasedev->migration = g_new0(VFIOMigration, 1);
+ vbasedev->migration->device_state = VFIO_DEVICE_STATE_RUNNING;
+ vbasedev->migration->data_fd = -1;
+ vbasedev->migration->v2 = true;
+ } else if (ret == -ENOTTY) {
+ /* Migration v1 */
+ ret = vfio_get_dev_region_info(vbasedev,
+ VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
+ VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
+ &info);
+ if (ret) {
+ return ret;
+ }
- vbasedev->migration = g_new0(VFIOMigration, 1);
- vbasedev->migration->device_state_v1 = VFIO_DEVICE_STATE_V1_RUNNING;
- vbasedev->migration->vm_running = runstate_is_running();
+ vbasedev->migration = g_new0(VFIOMigration, 1);
+ vbasedev->migration->device_state_v1 = VFIO_DEVICE_STATE_V1_RUNNING;
+ vbasedev->migration->vm_running = runstate_is_running();
- 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;
- }
+ 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;
- }
+ if (!vbasedev->migration->region.size) {
+ error_report("%s: Invalid zero-sized VFIO migration region %d",
+ vbasedev->name, info->index);
+ ret = -EINVAL;
+ goto err;
+ }
- g_free(info);
+ g_free(info);
+ } else {
+ return ret;
+ }
migration = vbasedev->migration;
migration->vbasedev = vbasedev;
@@ -847,11 +1245,20 @@ static int vfio_migration_init(VFIODevice *vbasedev)
}
strpadcpy(id, sizeof(id), path, '\0');
- register_savevm_live(id, VMSTATE_INSTANCE_ID_ANY, 1,
- &savevm_vfio_v1_handlers, vbasedev);
+ if (migration->v2) {
+ 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);
+ } else {
+ register_savevm_live(id, VMSTATE_INSTANCE_ID_ANY, 1,
+ &savevm_vfio_v1_handlers, vbasedev);
+
+ migration->vm_state = qdev_add_vm_change_state_handler(
+ vbasedev->dev, vfio_v1_vmstate_change, vbasedev);
+ }
- migration->vm_state = qdev_add_vm_change_state_handler(
- vbasedev->dev, vfio_v1_vmstate_change, vbasedev);
migration->migration_state.notify = vfio_migration_state_notifier;
add_migration_state_change_notifier(&migration->migration_state);
return 0;
@@ -149,20 +149,27 @@ vfio_display_edid_write_error(void) ""
# migration.c
vfio_migration_probe(const char *name) " (%s)"
+vfio_migration_set_state(const char *name, const char *state) " (%s) state %s"
vfio_migration_v1_set_state(const char *name, uint32_t state) " (%s) state %d"
+vfio_vmstate_change(const char *name, int running, const char *reason, const char *dev_state) " (%s) running %d reason %s device state %s"
vfio_v1_vmstate_change(const char *name, int running, const char *reason, uint32_t dev_state) " (%s) running %d reason %s device state %d"
vfio_migration_state_notifier(const char *name, const char *state) " (%s) state %s"
+vfio_save_setup(const char *name, uint64_t data_buffer_size) " (%s) data buffer size 0x%"PRIx64
vfio_v1_save_setup(const char *name) " (%s)"
vfio_save_cleanup(const char *name) " (%s)"
vfio_save_buffer(const char *name, uint64_t data_offset, uint64_t data_size, uint64_t pending) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64" pending 0x%"PRIx64
vfio_update_pending(const char *name, uint64_t pending) " (%s) pending 0x%"PRIx64
vfio_save_device_config_state(const char *name) " (%s)"
+vfio_state_pending_exact(const char *name, uint64_t precopy, uint64_t postcopy, uint64_t compatible, uint64_t stopcopy_size) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" compatible 0x%"PRIx64" stopcopy size 0x%"PRIx64
vfio_v1_state_pending(const char *name, uint64_t precopy, uint64_t postcopy, uint64_t compatible) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" compatible 0x%"PRIx64
vfio_save_iterate(const char *name, int data_size) " (%s) data_size %d"
+vfio_save_complete_precopy(const char *name, int ret) " (%s) ret %d"
vfio_v1_save_complete_precopy(const char *name) " (%s)"
vfio_load_device_config_state(const char *name) " (%s)"
vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64
vfio_v1_load_state_device_data(const char *name, uint64_t data_offset, uint64_t data_size) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64
+vfio_load_state_device_data(const char *name, uint64_t data_size, int ret) " (%s) size 0x%"PRIx64" ret %d"
vfio_load_cleanup(const char *name) " (%s)"
vfio_get_dirty_bitmap(int fd, uint64_t iova, uint64_t size, uint64_t bitmap_size, uint64_t start) "container fd=%d, iova=0x%"PRIx64" size= 0x%"PRIx64" bitmap_size=0x%"PRIx64" start=0x%"PRIx64
vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu dirty @ 0x%"PRIx64" - 0x%"PRIx64
+vfio_save_block(const char *name, int data_size) " (%s) data_size %d"
Implement the basic mandatory part of VFIO migration protocol v2. This includes all functionality that is necessary to support VFIO_MIGRATION_STOP_COPY part of the v2 protocol. The two protocols, v1 and v2, will co-exist and in the following patches v1 protocol code will be removed. There are several main differences between v1 and v2 protocols: - VFIO device state is now represented as a finite state machine instead of a bitmap. - Migration interface with kernel is now done using VFIO_DEVICE_FEATURE ioctl and normal read() and write() instead of the migration region. - Pre-copy is made optional in v2 protocol. Support for pre-copy will be added later on. Detailed information about VFIO migration protocol v2 and its difference compared to v1 protocol can be found here [1]. [1] https://lore.kernel.org/all/20220224142024.147653-10-yishaih@nvidia.com/ Signed-off-by: Avihai Horon <avihaih@nvidia.com> --- include/hw/vfio/vfio-common.h | 5 + hw/vfio/common.c | 17 +- hw/vfio/migration.c | 481 +++++++++++++++++++++++++++++++--- hw/vfio/trace-events | 7 + 4 files changed, 471 insertions(+), 39 deletions(-)