Add an ioctl cmd to allow userspace to figure out the vq's worker.
Signed-off-by: Mike Christie <michael.chris...@oracle.com>
---
drivers/vhost/vhost.c | 10 ++++++++++
include/uapi/linux/vhost.h | 3 ++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index b2d567a4cd53..e6148acbe928 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1885,6 +1885,16 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int
ioctl, void __user *arg
if (!r && copy_to_user(argp, &w, sizeof(w)))
r = -EFAULT;
break;
+ case VHOST_GET_VRING_WORKER:
+ w.index = idx;
+ w.pid = -1;
+
+ if (vq->worker)
+ w.pid = vq->worker->task->pid;
+
+ if (copy_to_user(argp, &w, sizeof(w)))
+ r = -EFAULT;
+ break;
default:
r = -ENOIOCTLCMD;
}
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 61a57f5366ee..24569f89611b 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -75,7 +75,8 @@
* worker will be created and bound to the vq.
*/
#define VHOST_SET_VRING_WORKER _IOWR(VHOST_VIRTIO, 0x15, struct
vhost_vring_worker)
-
+/* Return the vqs worker's pid. If no worker is set pid is -1 */
+#define VHOST_GET_VRING_WORKER _IOR(VHOST_VIRTIO, 0x16, struct
vhost_vring_worker)
/* The following ioctls use eventfd file descriptors to signal and poll
* for events. */
--
2.25.1
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