[PATCH v15 06/13] vhost: forbid change vq groups ASID if DRIVER_OK is set

Eugenio Pérez
2026-01-19T14:33:39Z

Only vdpa_sim support it. Forbid this behaviour as there is no use for
it right now, we can always enable it in the future with a feature flag.

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
v12: Fix typo in patch message (MST).
---
drivers/vhost/vdpa.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 9d25b735b43d..3f0184d42075 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -682,6 +682,8 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
return -EFAULT;
if (idx >= vdpa->ngroups || s.num >= vdpa->nas)
return -EINVAL;
+ if (ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK)
+ return -EBUSY;
if (!ops->set_group_asid)
return -EOPNOTSUPP;
return ops->set_group_asid(vdpa, idx, s.num);
--
2.52.0