Sequence during _RESUMING device state:
While data for this device is available, repeat below steps:
a. read data_offset from where user application should write data.
b. write data of data_size to migration region from data_offset.
c. write data_size which indicates vendor driver that data is written in
staging buffer.
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>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
hw/vfio/migration.c | 192 +++++++++++++++++++++++++++++++++++++++++++++++++++
hw/vfio/trace-events | 3 +
2 files changed, 195 insertions(+)
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 5506cef15d88..46d05d230e2a 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -257,6 +257,77 @@ 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)
+{
+ 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;
@@ -293,6 +364,33 @@ 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) {
+ 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 int vfio_save_setup(QEMUFile *f, void *opaque)
@@ -477,12 +575,106 @@ 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.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_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)
+{
+ vfio_save_cleanup(opaque);
+ 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:
+ {
+ 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:
+ {
+ 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,
+ .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 9f5712dab1ea..4804cc266d44 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -159,3 +159,6 @@ vfio_save_device_config_state(const char *name) " (%s)"
vfio_save_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) " (%s)"
+vfio_load_device_config_state(const char *name) " (%s)"
+vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64
+vfio_load_state_device_data(const char *name, uint64_t data_offset, uint64_t
data_size) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64
--
2.7.0
