vhost: make vhost work queue visible

The vhost work queue allows processing to be done in vhost worker thread
context, which uses the owner process mm.  Access to the vring and guest
memory is typically only possible from vhost worker context so it is
useful to allow work to be queued directly by users.

Currently vhost_net only uses the poll wrappers which do not expose the
work queue functions.  However, for tcm_vhost (vhost_scsi) it will be
necessary to queue custom work.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Zhi Yong Wu <wuzhy@cn.ibm.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 112156f68afb2117875087447d01222d74b33ba7..ef82a0d18489365e64a7ab0958bf01f654cfc8b1 100644 (file)
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -64,7 +64,7 @@ static int vhost_poll_wakeup(wait_queue_t *wait, unsigned mode, int sync,
        return 0;
 }
 
-static void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn)
+void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn)
 {
        INIT_LIST_HEAD(&work->node);
        work->fn = fn;
@@ -137,8 +137,7 @@ void vhost_poll_flush(struct vhost_poll *poll)
        vhost_work_flush(poll->dev, &poll->work);
 }
 
-static inline void vhost_work_queue(struct vhost_dev *dev,
-                                   struct vhost_work *work)
+void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
 {
        unsigned long flags;
 

diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 07b97631fd34244265f388bd902e5c1b99a65268..1125af3d27d12b3f724a79a259aa774e6d214b67 100644 (file)
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -43,6 +43,9 @@ struct vhost_poll {
        struct vhost_dev         *dev;
 };
 
+void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn);
+void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work);
+
 void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
                     unsigned long mask, struct vhost_dev *dev);
 void vhost_poll_start(struct vhost_poll *poll, struct file *file);