vhost-net: batch use/unuse mm

Move use/unuse mm to vhost.c which makes it possible to batch these
operations.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 9920bae6ee43..c17c881e235a 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -15,6 +15,7 @@
 #include <linux/vhost.h>
 #include <linux/virtio_net.h>
 #include <linux/mm.h>
+#include <linux/mmu_context.h>
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
 #include <linux/rcupdate.h>
@@ -177,6 +178,8 @@ static int vhost_worker(void *data)
         struct vhost_work *work = NULL;
         unsigned uninitialized_var(seq);
 
+        use_mm(dev->mm);
+
         for (;;) {
                 /* mb paired w/ kthread_stop */
                 set_current_state(TASK_INTERRUPTIBLE);
@@ -191,7 +194,7 @@ static int vhost_worker(void *data)
                 if (kthread_should_stop()) {
                         spin_unlock_irq(&dev->work_lock);
                         __set_current_state(TASK_RUNNING);
-                        return 0;
+                        break;
                 }
                 if (!list_empty(&dev->work_list)) {
                         work = list_first_entry(&dev->work_list,
@@ -209,6 +212,8 @@ static int vhost_worker(void *data)
                         schedule();
 
         }
+        unuse_mm(dev->mm);
+        return 0;
 }
 
 /* Helper to allocate iovec buffers for all vqs. */