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virtio: new post_load hook 

Post load hook in virtio vmsd is called early while device is processed,
and when VirtIODevice core isn't fully initialized.  Most device
specific code isn't ready to deal with a device in such state, and
behaves weirdly.

Add a new post_load hook in a device class instead.  Devices should use
this unless they specifically want to verify the migration stream as
it's processed, e.g. for bounds checking.

Cc: qemu-stable@nongnu.org
Suggested-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Mikhail Sennikovsky <mikhail.sennikovskii@cloud.ionos.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2019-10-11 15:58:03 +02:00 committed by Jason Wang
parent 34ea023d4b
commit 1dd713837c
2 changed files with 13 additions and 0 deletions
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7
hw/virtio/virtio.c
View File

@ -2291,6 +2291,13 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
}
rcu_read_unlock();
if (vdc->post_load) {
ret = vdc->post_load(vdev);
if (ret) {
return ret;
}
}
return 0;
}

6
include/hw/virtio/virtio.h
View File

@ -158,6 +158,12 @@ typedef struct VirtioDeviceClass {
*/
void (*save)(VirtIODevice *vdev, QEMUFile *f);
int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
/* Post load hook in vmsd is called early while device is processed, and
* when VirtIODevice isn't fully initialized. Devices should use this instead,
* unless they specifically want to verify the migration stream as it's
* processed, e.g. for bounds checking.
*/
int (*post_load)(VirtIODevice *vdev);
const VMStateDescription *vmsd;
} VirtioDeviceClass;