[PATCH] vdpa: dont check vhost_vdpa->suspended when unsupported

[Zhu Lingshan]

When read the state of a virtqueue, vhost_vdpa need
to check whether the device is suspended.

This commit verifies whether VHOST_BACKEND_F_SUSPEND is
negotiated when checking vhost_vdpa->suspended.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
---
 hw/virtio/vhost-vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index b3094e8a8b..ae176c06dd 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -1397,7 +1397,7 @@ static int vhost_vdpa_get_vring_base(struct vhost_dev 
*dev,
         return 0;
     }
 
-    if (!v->suspended) {
+    if ((dev->backend_cap & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) && 
(!v->suspended)) {
         /*
          * Cannot trust in value returned by device, let vhost recover used
          * idx from guest.
-- 
2.39.1