| Message ID | 20231219180858.120898-4-dtatulea@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vdpa/mlx5: Add support for resumable vqs | expand |
On Tue, Dec 19, 2023 at 7:09 PM Dragos Tatulea <dtatulea@nvidia.com> wrote: > > The virtio spec doesn't allow changing virtqueue state after > DRIVER_OK. Some devices do support this operation when the device is > suspended. The VHOST_BACKEND_F_CHANGEABLE_VQ_STATE_IN_SUSPEND flag > advertises this support as a backend features. > > Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com> > Suggested-by: Eugenio Pérez <eperezma@redhat.com> > --- > include/uapi/linux/vhost_types.h | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h > index aacd067afc89..848dadc95ca1 100644 > --- a/include/uapi/linux/vhost_types.h > +++ b/include/uapi/linux/vhost_types.h > @@ -196,5 +196,9 @@ struct vhost_vdpa_iova_range { > * and is in state DRIVER_OK. > */ > #define VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND 0x9 > +/* Device supports changing virtqueue state when device is suspended > + * and is in state DRIVER_OK. > + */ > +#define VHOST_BACKEND_F_CHANGEABLE_VQ_STATE_IN_SUSPEND 0x10 Acked-by: Eugenio Pérez <eperezma@redhat.com> It would be great to find a shorter ID but I'm very bad at naming :(. Maybe it is ok to drop the _BACKEND_ word? I'm ok with carrying the acked-by if so. Thanks! > > #endif > -- > 2.43.0 >
diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h index aacd067afc89..848dadc95ca1 100644 --- a/include/uapi/linux/vhost_types.h +++ b/include/uapi/linux/vhost_types.h @@ -196,5 +196,9 @@ struct vhost_vdpa_iova_range { * and is in state DRIVER_OK. */ #define VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND 0x9 +/* Device supports changing virtqueue state when device is suspended + * and is in state DRIVER_OK. + */ +#define VHOST_BACKEND_F_CHANGEABLE_VQ_STATE_IN_SUSPEND 0x10 #endif
The virtio spec doesn't allow changing virtqueue state after DRIVER_OK. Some devices do support this operation when the device is suspended. The VHOST_BACKEND_F_CHANGEABLE_VQ_STATE_IN_SUSPEND flag advertises this support as a backend features. Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com> Suggested-by: Eugenio Pérez <eperezma@redhat.com> --- include/uapi/linux/vhost_types.h | 4 ++++ 1 file changed, 4 insertions(+)