vhost-vdpa: map virtqueue notification area if possible

This patch implements the vq notification mapping support for
vhost-vDPA. This is simply done by using mmap()/munmap() for the
vhost-vDPA fd during device start/stop. For the device without
notification mapping support, we fall back to eventfd based
notification gracefully.

Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h
index ae9ee7adb2..9188226d8b 100644
--- a/include/hw/virtio/vhost-vdpa.h
+++ b/include/hw/virtio/vhost-vdpa.h
@@ -14,11 +14,17 @@
 
 #include "hw/virtio/virtio.h"
 
+typedef struct VhostVDPAHostNotifier {
+    MemoryRegion mr;
+    void *addr;
+} VhostVDPAHostNotifier;
+
 typedef struct vhost_vdpa {
     int device_fd;
     uint32_t msg_type;
     MemoryListener listener;
     struct vhost_dev *dev;
+    VhostVDPAHostNotifier notifier[VIRTIO_QUEUE_MAX];
 } VhostVDPA;
 
 #endif