Add an ioctl cmd to allow userspace to figure out the vq's worker. Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx> --- 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 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
