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vfio: Add load state functions to SaveVMHandlers
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 <kwankhede@nvidia.com> Reviewed-by: Neo Jia <cjia@nvidia.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Yan Zhao <yan.y.zhao@intel.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede
Alex Williamson
parent
1bc3c535ff
commit
3336d21710
@ -257,6 +257,77 @@ static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev, uint64_t *size)
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return ret;
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}
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static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev,
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uint64_t data_size)
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{
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VFIORegion *region = &vbasedev->migration->region;
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uint64_t data_offset = 0, size, report_size;
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int ret;
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do {
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ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset),
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region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset));
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if (ret < 0) {
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return ret;
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}
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if (data_offset + data_size > region->size) {
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/*
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* If data_size is greater than the data section of migration region
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* then iterate the write buffer operation. This case can occur if
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* size of migration region at destination is smaller than size of
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* migration region at source.
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*/
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report_size = size = region->size - data_offset;
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data_size -= size;
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} else {
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report_size = size = data_size;
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data_size = 0;
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}
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trace_vfio_load_state_device_data(vbasedev->name, data_offset, size);
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while (size) {
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void *buf;
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uint64_t sec_size;
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bool buf_alloc = false;
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buf = get_data_section_size(region, data_offset, size, &sec_size);
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if (!buf) {
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buf = g_try_malloc(sec_size);
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if (!buf) {
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error_report("%s: Error allocating buffer ", __func__);
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return -ENOMEM;
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}
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buf_alloc = true;
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}
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qemu_get_buffer(f, buf, sec_size);
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if (buf_alloc) {
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ret = vfio_mig_write(vbasedev, buf, sec_size,
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region->fd_offset + data_offset);
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g_free(buf);
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if (ret < 0) {
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return ret;
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}
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}
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size -= sec_size;
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data_offset += sec_size;
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}
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ret = vfio_mig_write(vbasedev, &report_size, sizeof(report_size),
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region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size));
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if (ret < 0) {
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return ret;
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}
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} while (data_size);
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return 0;
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}
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static int vfio_update_pending(VFIODevice *vbasedev)
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{
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VFIOMigration *migration = vbasedev->migration;
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@ -293,6 +364,33 @@ static int vfio_save_device_config_state(QEMUFile *f, void *opaque)
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return qemu_file_get_error(f);
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}
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static int vfio_load_device_config_state(QEMUFile *f, void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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uint64_t data;
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if (vbasedev->ops && vbasedev->ops->vfio_load_config) {
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int ret;
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ret = vbasedev->ops->vfio_load_config(vbasedev, f);
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if (ret) {
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error_report("%s: Failed to load device config space",
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vbasedev->name);
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return ret;
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}
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}
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data = qemu_get_be64(f);
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if (data != VFIO_MIG_FLAG_END_OF_STATE) {
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error_report("%s: Failed loading device config space, "
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"end flag incorrect 0x%"PRIx64, vbasedev->name, data);
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return -EINVAL;
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}
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trace_vfio_load_device_config_state(vbasedev->name);
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return qemu_file_get_error(f);
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}
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static void vfio_migration_cleanup(VFIODevice *vbasedev)
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{
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VFIOMigration *migration = vbasedev->migration;
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@ -483,12 +581,109 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
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return ret;
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}
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static int vfio_load_setup(QEMUFile *f, void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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VFIOMigration *migration = vbasedev->migration;
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int ret = 0;
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if (migration->region.mmaps) {
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ret = vfio_region_mmap(&migration->region);
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if (ret) {
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error_report("%s: Failed to mmap VFIO migration region %d: %s",
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vbasedev->name, migration->region.nr,
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strerror(-ret));
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error_report("%s: Falling back to slow path", vbasedev->name);
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}
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}
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ret = vfio_migration_set_state(vbasedev, ~VFIO_DEVICE_STATE_MASK,
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VFIO_DEVICE_STATE_RESUMING);
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if (ret) {
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error_report("%s: Failed to set state RESUMING", vbasedev->name);
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if (migration->region.mmaps) {
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vfio_region_unmap(&migration->region);
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}
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}
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return ret;
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}
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static int vfio_load_cleanup(void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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vfio_migration_cleanup(vbasedev);
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trace_vfio_load_cleanup(vbasedev->name);
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return 0;
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}
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static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
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{
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VFIODevice *vbasedev = opaque;
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int ret = 0;
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uint64_t data;
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data = qemu_get_be64(f);
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while (data != VFIO_MIG_FLAG_END_OF_STATE) {
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trace_vfio_load_state(vbasedev->name, data);
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switch (data) {
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case VFIO_MIG_FLAG_DEV_CONFIG_STATE:
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{
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ret = vfio_load_device_config_state(f, opaque);
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if (ret) {
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return ret;
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}
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break;
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}
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case VFIO_MIG_FLAG_DEV_SETUP_STATE:
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{
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data = qemu_get_be64(f);
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if (data == VFIO_MIG_FLAG_END_OF_STATE) {
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return ret;
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} else {
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error_report("%s: SETUP STATE: EOS not found 0x%"PRIx64,
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vbasedev->name, data);
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return -EINVAL;
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}
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break;
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}
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case VFIO_MIG_FLAG_DEV_DATA_STATE:
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{
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uint64_t data_size = qemu_get_be64(f);
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if (data_size) {
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ret = vfio_load_buffer(f, vbasedev, data_size);
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if (ret < 0) {
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return ret;
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}
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}
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break;
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}
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default:
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error_report("%s: Unknown tag 0x%"PRIx64, vbasedev->name, data);
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return -EINVAL;
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}
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data = qemu_get_be64(f);
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ret = qemu_file_get_error(f);
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if (ret) {
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return ret;
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}
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}
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return ret;
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}
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static SaveVMHandlers savevm_vfio_handlers = {
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.save_setup = vfio_save_setup,
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.save_cleanup = vfio_save_cleanup,
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.save_live_pending = vfio_save_pending,
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.save_live_iterate = vfio_save_iterate,
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.save_live_complete_precopy = vfio_save_complete_precopy,
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.load_setup = vfio_load_setup,
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.load_cleanup = vfio_load_cleanup,
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.load_state = vfio_load_state,
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};
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/* ---------------------------------------------------------------------- */
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@ -159,3 +159,7 @@ vfio_save_device_config_state(const char *name) " (%s)"
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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
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vfio_save_iterate(const char *name, int data_size) " (%s) data_size %d"
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vfio_save_complete_precopy(const char *name) " (%s)"
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vfio_load_device_config_state(const char *name) " (%s)"
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vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64
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vfio_load_state_device_data(const char *name, uint64_t data_offset, uint64_t data_size) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64
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vfio_load_cleanup(const char *name) " (%s)"
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