virtio: move allocation to virtqueue_pop/vring_pop

The return code of virtqueue_pop/vring_pop is unused except to check for
errors or 0.  We can thus easily move allocation inside the functions
and just return a pointer to the VirtQueueElement.

The advantage is that we will be able to allocate only the space that
is needed for the actual size of the s/g list instead of the full
VIRTQUEUE_MAX_SIZE items.  Currently VirtQueueElement takes about 48K
of memory, and this kind of allocation puts a lot of stress on malloc.
By cutting the size by two or three orders of magnitude, malloc can
use much more efficient algorithms.

The patch is pretty large, but changes to each device are testable
more or less independently.  Splitting it would mostly add churn.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>

1 files changed, 16 insertions, 8 deletions

diff --git a/hw/input/virtio-input.c b/hw/input/virtio-input.c
index f12ed8a..5061f4c 100644
--- a/hw/input/virtio-input.c
+++ b/hw/input/virtio-input.c
@@ -17,7 +17,7 @@
 
 void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
 {
-    VirtQueueElement elem;
+    VirtQueueElement *elem;
     unsigned have, need;
     int i, len;
 
@@ -50,14 +50,16 @@ void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
 
     /* ... and finally pass them to the guest */
     for (i = 0; i < vinput->qindex; i++) {
-        if (!virtqueue_pop(vinput->evt, &elem)) {
+        elem = virtqueue_pop(vinput->evt, sizeof(VirtQueueElement));
+        if (!elem) {
             /* should not happen, we've checked for space beforehand */
             fprintf(stderr, "%s: Huh?  No vq elem available ...\n", __func__);
             return;
         }
-        len = iov_from_buf(elem.in_sg, elem.in_num,
+        len = iov_from_buf(elem->in_sg, elem->in_num,
                            0, vinput->queue+i, sizeof(virtio_input_event));
-        virtqueue_push(vinput->evt, &elem, len);
+        virtqueue_push(vinput->evt, elem, len);
+        g_free(elem);
     }
     virtio_notify(VIRTIO_DEVICE(vinput), vinput->evt);
     vinput->qindex = 0;
@@ -73,17 +75,23 @@ static void virtio_input_handle_sts(VirtIODevice *vdev, VirtQueue *vq)
     VirtIOInputClass *vic = VIRTIO_INPUT_GET_CLASS(vdev);
     VirtIOInput *vinput = VIRTIO_INPUT(vdev);
     virtio_input_event event;
-    VirtQueueElement elem;
+    VirtQueueElement *elem;
     int len;
 
-    while (virtqueue_pop(vinput->sts, &elem)) {
+    for (;;) {
+        elem = virtqueue_pop(vinput->sts, sizeof(VirtQueueElement));
+        if (!elem) {
+            break;
+        }
+
         memset(&event, 0, sizeof(event));
-        len = iov_to_buf(elem.out_sg, elem.out_num,
+        len = iov_to_buf(elem->out_sg, elem->out_num,
                          0, &event, sizeof(event));
         if (vic->handle_status) {
             vic->handle_status(vinput, &event);
         }
-        virtqueue_push(vinput->sts, &elem, len);
+        virtqueue_push(vinput->sts, elem, len);
+        g_free(elem);
     }
     virtio_notify(vdev, vinput->sts);
 }