[RFC V1 12/13] vdpa_sim: new owner capability

[Steve Sistare]

The vdpa_sim device supports ownership transfer to a new process, so
advertise VHOST_BACKEND_F_NEW_OWNER.  User virtual addresses are used
by the software iommu, so VHOST_IOTLB_REMAP is required after
VHOST_NEW_OWNER, so advertise VHOST_BACKEND_F_IOTLB_REMAP.

Signed-off-by: Steve Sistare <steven.sistare@xxxxxxxxxx>
---
 drivers/vdpa/vdpa_sim/vdpa_sim.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 8734834983cb..d037869d8a89 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -430,7 +430,13 @@ static u64 vdpasim_get_device_features(struct vdpa_device *vdpa)
 
 static u64 vdpasim_get_backend_features(const struct vdpa_device *vdpa)
 {
-	return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK);
+	u64 features = BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK) |
+		       BIT_ULL(VHOST_BACKEND_F_NEW_OWNER);
+
+	if (use_va)
+		features += BIT_ULL(VHOST_BACKEND_F_IOTLB_REMAP);
+
+	return features;
 }
 
 static int vdpasim_set_driver_features(struct vdpa_device *vdpa, u64 features)
-- 
2.39.3