[Qemu-devel] [PATCH 2/2 v3] virtio-rng: Serve pending request if any after timer bumps up quota.

[Pankaj Gupta]

We are arming timer when we get first request from guest.
Even if guest pulls all the data we will be serving guest
only when timer bumps up new quota. When timer expires
we check if we have a pending request from guest, we
serve it and re-arm the timer else we don't do any thing.

Signed-off-by: Pankaj Gupta <address@hidden>
---
 hw/virtio/virtio-rng.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
index ae04352..3d9a002 100644
--- a/hw/virtio/virtio-rng.c
+++ b/hw/virtio/virtio-rng.c
@@ -142,9 +142,13 @@ static int virtio_rng_load(QEMUFile *f, void *opaque, int 
version_id)
 static void check_rate_limit(void *opaque)
 {
     VirtIORNG *vrng = opaque;
+    size_t size;
 
     vrng->quota_remaining = vrng->conf.max_bytes;
-    virtio_rng_process(vrng);
+    size = get_request_size(vrng->vq, 0);
+    if (size > 0) {
+        virtio_rng_process(vrng);
+    }
     vrng->activate_timer = true;
 }
 
-- 
1.9.3