diff options
| author | Eugenio Pérez <eperezma@redhat.com> | 2026-07-07 14:25:02 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2026-08-19 06:38:48 -0400 |
| commit | 4c318d91cc60a0c2c94bcb6db2630baed43e9387 (patch) | |
| tree | 9e1830f489602f71aa9e0799aa1ac3709722b2b1 /include/uapi/linux | |
| parent | 3b441820cb61ac1137dd4b336adfb4892cda4233 (diff) | |
vduse: add F_QUEUE_READY feature
Add the VDUSE_F_QUEUE_READY feature flag. This allows the kernel module
to explicitly signal userspace when a specific virtqueue has been
enabled.
In scenarios like Live Migration of VirtIO net devices, the dataplane
starts after the control virtqueue allowing QEMU to apply configuration
in the destination device.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260707122502.239022-5-eperezma@redhat.com>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/vduse.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h index f14c965bb7f6..7285f8570237 100644 --- a/include/uapi/linux/vduse.h +++ b/include/uapi/linux/vduse.h @@ -14,6 +14,9 @@ #define VDUSE_API_VERSION_1 1 +/* The VDUSE instance expects a request for vq ready */ +#define VDUSE_F_QUEUE_READY 0 + /* * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION). * This is used for future extension. @@ -331,6 +334,7 @@ enum vduse_req_type { VDUSE_SET_STATUS, VDUSE_UPDATE_IOTLB, VDUSE_SET_VQ_GROUP_ASID, + VDUSE_SET_VQ_READY, }; /** @@ -379,6 +383,15 @@ struct vduse_iova_range_v2 { }; /** + * struct vduse_vq_ready - Virtqueue ready request message + * @num: Virtqueue number + */ +struct vduse_vq_ready { + __u32 num; + __u32 ready; +}; + +/** * struct vduse_dev_request - control request * @type: request type * @request_id: request id @@ -388,6 +401,7 @@ struct vduse_iova_range_v2 { * @iova: IOVA range for updating * @iova_v2: IOVA range for updating if API_VERSION >= 1 * @vq_group_asid: ASID of a virtqueue group + * @vq_ready: Virtqueue ready request * @padding: padding * * Structure used by read(2) on /dev/vduse/$NAME. @@ -405,6 +419,10 @@ struct vduse_dev_request { */ struct vduse_iova_range_v2 iova_v2; struct vduse_vq_group_asid vq_group_asid; + + /* Only if VDUSE_F_QUEUE_READY is negotiated */ + struct vduse_vq_ready vq_ready; + __u32 padding[32]; }; }; |