rng: add request queue support to rng-random

Requests are now created in the RngBackend parent class and the
code path is shared by both rng-egd and rng-random.

This commit fixes the rng-random implementation which processed
only one request at a time and simply discarded all but the most
recent one. In the guest this manifested as delayed completion
of reads from virtio-rng, i.e. a read was completed only after
another read was issued.

By switching rng-random to use the same request queue as rng-egd,
the unsafe stack-based allocation of the entropy buffer is
eliminated and replaced with g_malloc.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1456994238-9585-5-git-send-email-lprosek@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/include/sysemu/rng.h b/include/sysemu/rng.h
index 08a2eda..4fffd68 100644
--- a/include/sysemu/rng.h
+++ b/include/sysemu/rng.h
@@ -45,8 +45,7 @@ struct RngBackendClass
 {
     ObjectClass parent_class;
 
-    void (*request_entropy)(RngBackend *s, size_t size,
-                            EntropyReceiveFunc *receive_entropy, void *opaque);
+    void (*request_entropy)(RngBackend *s, RngRequest *req);
 
     void (*opened)(RngBackend *s, Error **errp);
 };