Add the VHOST_BACKEND_F_NEW_OWNER backend capability, which indicates that
VHOST_NEW_OWNER is supported.
Signed-off-by: Steve Sistare <steven.sistare@xxxxxxxxxx>
---
drivers/vhost/vdpa.c | 7 ++++++-
include/uapi/linux/vhost_types.h | 2 ++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 5cf55ca4ec02..4396fe1a90c4 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -640,6 +640,10 @@ static long vhost_vdpa_new_owner(struct vhost_vdpa *v)
struct mm_struct *mm_new = current->mm;
long pinned_vm = v->pinned_vm;
unsigned long lock_limit = PFN_DOWN(rlimit(RLIMIT_MEMLOCK));
+ u64 features = vhost_vdpa_get_backend_features(v);
+
+ if (!(features & BIT_ULL(VHOST_BACKEND_F_NEW_OWNER)))
+ return -EOPNOTSUPP;
if (!mm_old)
return -EINVAL;
@@ -821,7 +825,8 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
BIT_ULL(VHOST_BACKEND_F_IOTLB_PERSIST) |
BIT_ULL(VHOST_BACKEND_F_SUSPEND) |
BIT_ULL(VHOST_BACKEND_F_RESUME) |
- BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK)))
+ BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK) |
+ BIT_ULL(VHOST_BACKEND_F_NEW_OWNER)))
return -EOPNOTSUPP;
if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) &&
!vhost_vdpa_can_suspend(v))
diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h
index d7656908f730..9177843951e9 100644
--- a/include/uapi/linux/vhost_types.h
+++ b/include/uapi/linux/vhost_types.h
@@ -192,5 +192,7 @@ struct vhost_vdpa_iova_range {
#define VHOST_BACKEND_F_DESC_ASID 0x7
/* IOTLB don't flush memory mapping across device reset */
#define VHOST_BACKEND_F_IOTLB_PERSIST 0x8
+/* Supports VHOST_NEW_OWNER */
+#define VHOST_BACKEND_F_NEW_OWNER 0x9
#endif
--
2.39.3
