Flow during _RESUMING device state:
- If Vendor driver defines mappable region, mmap migration region.
- Load config state.
- For data packet, till VFIO_MIG_FLAG_END_OF_STATE is not reached
- read data_size from packet, read buffer of data_size
- read data_offset from where QEMU should write data.
if region is mmaped, write data of data_size to mmaped region.
- write data_size.
In case of mmapped region, write to data_size indicates kernel
driver that data is written in staging buffer.
- if region is trapped, pwrite() data of data_size from data_offset.
- Repeat above until VFIO_MIG_FLAG_END_OF_STATE.
- Unmap migration region.
For user, data is opaque. User should write data in the same order as
received.
Signed-off-by: Kirti Wankhede <kwankh...@nvidia.com>
Reviewed-by: Neo Jia <c...@nvidia.com>
---
hw/vfio/migration.c | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/trace-events | 4 ++
2 files changed, 166 insertions(+)
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 4e9b4cce230b..5fb4c5329ede 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -249,6 +249,26 @@ static int vfio_save_device_config_state(QEMUFile *f, void
*opaque)
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) {
+ vbasedev->ops->vfio_load_config(vbasedev, f);
+ }
+
+ 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 int vfio_save_setup(QEMUFile *f, void *opaque)
@@ -421,12 +441,154 @@ static int vfio_save_complete_precopy(QEMUFile *f, void
*opaque)
return ret;
}
+static int vfio_load_setup(QEMUFile *f, void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ int ret = 0;
+
+ if (migration->region.buffer.mmaps) {
+ ret = vfio_region_mmap(&migration->region.buffer);
+ if (ret) {
+ error_report("%s: Failed to mmap VFIO migration region %d: %s",
+ vbasedev->name, migration->region.index,
+ strerror(-ret));
+ return ret;
+ }
+ }
+
+ ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING);
+ if (ret) {
+ error_report("%s: Failed to set state RESUMING", vbasedev->name);
+ }
+ return ret;
+}
+
+static int vfio_load_cleanup(void *opaque)
+{
+ vfio_save_cleanup(opaque);
+ return 0;
+}
+
+static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ int ret = 0;
+ uint64_t data, data_size;
+
+ 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:
+ {
+ ret = vfio_load_device_config_state(f, opaque);
+ if (ret) {
+ return ret;
+ }
+ break;
+ }
+ 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:
+ {
+ VFIORegion *region = &migration->region.buffer;
+ void *buf = NULL;
+ bool buffer_mmaped = false;
+ uint64_t data_offset = 0;
+
+ data_size = qemu_get_be64(f);
+ if (data_size == 0) {
+ break;
+ }
+
+ ret = pread(vbasedev->fd, &data_offset, sizeof(data_offset),
+ region->fd_offset +
+ offsetof(struct vfio_device_migration_info,
+ data_offset));
+ if (ret != sizeof(data_offset)) {
+ error_report("%s:Failed to get migration buffer data offset
%d",
+ vbasedev->name, ret);
+ return -EINVAL;
+ }
+
+ if (region->mmaps) {
+ buf = find_data_region(region, data_offset, data_size);
+ }
+
+ buffer_mmaped = (buf != NULL) ? true : false;
+
+ if (!buffer_mmaped) {
+ buf = g_try_malloc0(data_size);
+ if (!buf) {
+ error_report("%s: Error allocating buffer ", __func__);
+ return -ENOMEM;
+ }
+ }
+
+ qemu_get_buffer(f, buf, data_size);
+
+ ret = pwrite(vbasedev->fd, &data_size, sizeof(data_size),
+ region->fd_offset +
+ offsetof(struct vfio_device_migration_info, data_size));
+ if (ret != sizeof(data_size)) {
+ error_report("%s: Failed to set migration buffer data size %d",
+ vbasedev->name, ret);
+ if (!buffer_mmaped) {
+ g_free(buf);
+ }
+ return -EINVAL;
+ }
+
+ if (!buffer_mmaped) {
+ ret = pwrite(vbasedev->fd, buf, data_size,
+ region->fd_offset + data_offset);
+ g_free(buf);
+
+ if (ret != data_size) {
+ error_report("%s: Failed to set migration buffer %d",
+ vbasedev->name, ret);
+ return -EINVAL;
+ }
+ }
+ trace_vfio_load_state_device_data(vbasedev->name, data_offset,
+ data_size);
+ break;
+ }
+ }
+
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ return ret;
+ }
+ data = qemu_get_be64(f);
+ }
+
+ 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,
+ .load_setup = vfio_load_setup,
+ .load_cleanup = vfio_load_cleanup,
+ .load_state = vfio_load_state,
};
/* ---------------------------------------------------------------------- */
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 4c16e787f5a1..e01c94e6ebd4 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -157,3 +157,7 @@ vfio_save_device_config_state(char *name) " (%s)"
vfio_save_pending(char *name, uint64_t precopy, uint64_t postcopy, uint64_t
compatible) " (%s), precopy 0x%"PRIx64" postcopy 0x%x"PRIx64" compatible
0x%""PRIx64
vfio_save_iterate(char *name, int data_size) " (%s) data_size %d"
vfio_save_complete_precopy(char *name) " (%s)"
+vfio_load_device_config_state(char *name) " (%s)"
+vfio_load_state(char *name, uint64_t data) " (%s) data 0x%"PRIx64
+vfio_load_state_device_data(char *name, uint64_t data_offset, uint64_t
data_size) " (%s), Offset 0x%"PRIx64" size 0x%"PRIx64
+
--
2.7.0
