Merge remote-tracking branch 'remotes/amit-virtio-rng/tags/rng-for-2.6-1' into staging

rng:
- implement a request queue for rng-random so multiple guest requests
  don't result in vq buffers getting forgotten
- remove unused request cancellation code
- a VM with multiple vq buffers, when migrated, could get in a situation
  where not all buffers are handed back to the guest.  This is now
  fixed.

# gpg: Signature made Thu 03 Mar 2016 12:18:54 GMT using RSA key ID 854083B6
# gpg: Good signature from "Amit Shah <amit@amitshah.net>"
# gpg:                 aka "Amit Shah <amit@kernel.org>"
# gpg:                 aka "Amit Shah <amitshah@gmx.net>"

* remotes/amit-virtio-rng/tags/rng-for-2.6-1:
  virtio-rng: ask for more data if queue is not fully drained
  rng: add request queue support to rng-random
  rng: move request queue cleanup from RngEgd to RngBackend
  rng: move request queue from RngEgd to RngBackend
  rng: remove the unused request cancellation code
  MAINTAINERS: Add an entry for the include/sysemu/rng*.h files

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 19 insertions, 24 deletions

diff --git a/backends/rng-random.c b/backends/rng-random.c
index 8cdad6af7b..a6cb3858e3 100644
--- a/backends/rng-random.c
+++ b/backends/rng-random.c
@@ -22,10 +22,6 @@ struct RndRandom
 
     int fd;
     char *filename;
-
-    EntropyReceiveFunc *receive_func;
-    void *opaque;
-    size_t size;
 };
 
 /**
@@ -38,36 +34,35 @@ struct RndRandom
 static void entropy_available(void *opaque)
 {
     RndRandom *s = RNG_RANDOM(opaque);
-    uint8_t buffer[s->size];
-    ssize_t len;
 
-    len = read(s->fd, buffer, s->size);
-    if (len < 0 && errno == EAGAIN) {
-        return;
-    }
-    g_assert(len != -1);
+    while (s->parent.requests != NULL) {
+        RngRequest *req = s->parent.requests->data;
+        ssize_t len;
+
+        len = read(s->fd, req->data, req->size);
+        if (len < 0 && errno == EAGAIN) {
+            return;
+        }
+        g_assert(len != -1);
 
-    s->receive_func(s->opaque, buffer, len);
-    s->receive_func = NULL;
+        req->receive_entropy(req->opaque, req->data, len);
 
+        rng_backend_finalize_request(&s->parent, req);
+    }
+
+    /* We've drained all requests, the fd handler can be reset. */
     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 }
 
-static void rng_random_request_entropy(RngBackend *b, size_t size,
-                                        EntropyReceiveFunc *receive_entropy,
-                                        void *opaque)
+static void rng_random_request_entropy(RngBackend *b, RngRequest *req)
 {
     RndRandom *s = RNG_RANDOM(b);
 
-    if (s->receive_func) {
-        s->receive_func(s->opaque, NULL, 0);
+    if (s->parent.requests == NULL) {
+        /* If there are no pending requests yet, we need to
+         * install our fd handler. */
+        qemu_set_fd_handler(s->fd, entropy_available, NULL, s);
     }
-
-    s->receive_func = receive_entropy;
-    s->opaque = opaque;
-    s->size = size;
-
-    qemu_set_fd_handler(s->fd, entropy_available, NULL, s);
 }
 
 static void rng_random_opened(RngBackend *b, Error **errp)