+/*
+ * Mask off host interrupt callback notifications
+ */
+static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
+{
+ rbi->ring_buffer->interrupt_mask = 1;
+
+ /* make sure mask update is not reordered */
+ virt_mb();
+}
+
+/*
+ * Re-enable host callback and return number of outstanding bytes
+ */
+static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
+{
+
+ rbi->ring_buffer->interrupt_mask = 0;
+
+ /* make sure mask update is not reordered */
+ virt_mb();
+
+ /*
+ * Now check to see if the ring buffer is still empty.
+ * If it is not, we raced and we need to process new
+ * incoming messages.
+ */
+ return hv_get_bytes_to_read(rbi);
+}
+