vhost_copy_to_user is used to copy vring used elements to userspace.
We should use VHOST_ADDR_USED instead of VHOST_ADDR_DESC.

Fixes: f88949138058 ("vhost: introduce O(1) vq metadata cache")
Signed-off-by: Eric Auger <eric.au...@redhat.com>

---

This fixes a stall observed when running an aarch64 guest with
virtual smmu
---
 drivers/vhost/vhost.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index bec722e..f44aead 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -744,7 +744,7 @@ static int vhost_copy_to_user(struct vhost_virtqueue *vq, 
void __user *to,
                struct iov_iter t;
                void __user *uaddr = vhost_vq_meta_fetch(vq,
                                     (u64)(uintptr_t)to, size,
-                                    VHOST_ADDR_DESC);
+                                    VHOST_ADDR_USED);
 
                if (uaddr)
                        return __copy_to_user(uaddr, from, size);
-- 
2.5.5

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