diff options
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/vhost.h | 33 | ||||
| -rw-r--r-- | include/uapi/linux/vhost_types.h | 16 |
2 files changed, 49 insertions, 0 deletions
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index 92e1b700b51c..96dc146c2d15 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -45,6 +45,25 @@ #define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64) /* Specify an eventfd file descriptor to signal on log write. */ #define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int) +/* By default, a device gets one vhost_worker that its virtqueues share. This + * command allows the owner of the device to create an additional vhost_worker + * for the device. It can later be bound to 1 or more of its virtqueues using + * the VHOST_ATTACH_VRING_WORKER command. + * + * This must be called after VHOST_SET_OWNER and the caller must be the owner + * of the device. The new thread will inherit caller's cgroups and namespaces, + * and will share the caller's memory space. The new thread will also be + * counted against the caller's RLIMIT_NPROC value. + * + * The worker's ID used in other commands will be returned in + * vhost_worker_state. + */ +#define VHOST_NEW_WORKER _IOR(VHOST_VIRTIO, 0x8, struct vhost_worker_state) +/* Free a worker created with VHOST_NEW_WORKER if it's not attached to any + * virtqueue. If userspace is not able to call this for workers its created, + * the kernel will free all the device's workers when the device is closed. + */ +#define VHOST_FREE_WORKER _IOW(VHOST_VIRTIO, 0x9, struct vhost_worker_state) /* Ring setup. */ /* Set number of descriptors in ring. This parameter can not @@ -70,6 +89,20 @@ #define VHOST_VRING_BIG_ENDIAN 1 #define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state) #define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, struct vhost_vring_state) +/* Attach a vhost_worker created with VHOST_NEW_WORKER to one of the device's + * virtqueues. This must be done before VHOST_SET_VRING_KICK and the driver + * specific ioctl to activate the virtqueue (VHOST_SCSI_SET_ENDPOINT, + * VHOST_NET_SET_BACKEND, VHOST_VSOCK_SET_RUNNING) has been run. + * + * This will replace the virtqueue's existing worker. If the replaced worker + * is no longer attached to any virtqueues, it can be freed with + * VHOST_FREE_WORKER. + */ +#define VHOST_ATTACH_VRING_WORKER _IOW(VHOST_VIRTIO, 0x15, \ + struct vhost_vring_worker) +/* Return the vring worker's ID */ +#define VHOST_GET_VRING_WORKER _IOWR(VHOST_VIRTIO, 0x16, \ + struct vhost_vring_worker) /* The following ioctls use eventfd file descriptors to signal and poll * for events. */ diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h index c5690a8992d8..d3aad12ad1fa 100644 --- a/include/uapi/linux/vhost_types.h +++ b/include/uapi/linux/vhost_types.h @@ -47,6 +47,22 @@ struct vhost_vring_addr { __u64 log_guest_addr; }; +struct vhost_worker_state { + /* + * For VHOST_NEW_WORKER the kernel will return the new vhost_worker id. + * For VHOST_FREE_WORKER this must be set to the id of the vhost_worker + * to free. + */ + unsigned int worker_id; +}; + +struct vhost_vring_worker { + /* vring index */ + unsigned int index; + /* The id of the vhost_worker returned from VHOST_NEW_WORKER */ + unsigned int worker_id; +}; + /* no alignment requirement */ struct vhost_iotlb_msg { __u64 iova; |