[PATCH V2 13/45] vfio/container: mdev cpr blocker

[Steve Sistare <steven.sistare@oracle.com>]

During CPR, after VFIO_DMA_UNMAP_FLAG_VADDR, the vaddr is temporarily
invalid, so mediated devices cannot be supported.  Add a blocker for them.
This restriction will not apply to iommufd containers when CPR is added
for them in a future patch.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 hw/vfio/container.c        | 8 ++++++++
 include/hw/vfio/vfio-cpr.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index d26f78e..8130d1f 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -999,6 +999,13 @@ static bool vfio_legacy_attach_device(const char *name, VFIODevice *vbasedev,
         return false;
     }
 
+    if (vbasedev->mdev) {
+        error_setg(&vbasedev->cpr.mdev_blocker,
+                   "CPR does not support vfio mdev %s", vbasedev->name);
+        migrate_add_blocker_modes(&vbasedev->cpr.mdev_blocker, &error_fatal,
+                                  MIG_MODE_CPR_TRANSFER, -1);
+    }
+
     bcontainer = &group->container->bcontainer;
     vbasedev->bcontainer = bcontainer;
     QLIST_INSERT_HEAD(&bcontainer->device_list, vbasedev, container_next);
@@ -1015,6 +1022,7 @@ static void vfio_legacy_detach_device(VFIODevice *vbasedev)
     QLIST_REMOVE(vbasedev, container_next);
     vbasedev->bcontainer = NULL;
     trace_vfio_detach_device(vbasedev->name, group->groupid);
+    migrate_del_blocker(&vbasedev->cpr.mdev_blocker);
     vfio_put_base_device(vbasedev);
     vfio_put_group(group);
 }
diff --git a/include/hw/vfio/vfio-cpr.h b/include/hw/vfio/vfio-cpr.h
index 1a3eee9..25ac944 100644
--- a/include/hw/vfio/vfio-cpr.h
+++ b/include/hw/vfio/vfio-cpr.h
@@ -17,6 +17,7 @@ typedef struct VFIOContainerCPR {
 
 typedef struct VFIODeviceCPR {
     bool reused;
+    Error *mdev_blocker;
 } VFIODeviceCPR;
 
 struct VFIOContainer;
-- 
1.8.3.1