File 0297-virtio-cache-used_idx-in-a-VirtQueu.patch of Package qemu.8405

From 32b10933c38a1bccea2d6448ff4a5250c2d28c7b Mon Sep 17 00:00:00 2001
From: Vincenzo Maffione <v.maffione@gmail.com>
Date: Sun, 31 Jan 2016 11:29:04 +0100
Subject: [PATCH] virtio: cache used_idx in a VirtQueue field

Accessing used_idx in the VQ requires an expensive access to
guest physical memory. Before this patch, 3 accesses are normally
done for each pop/push/notify call. However, since the used_idx is
only written by us, we can track it in our internal data structure.

Signed-off-by: Vincenzo Maffione <v.maffione@gmail.com>
Message-Id: <3d062ec54e9a7bf9fb325c1fd693564951f2b319.1450218353.git.v.maffione@gmail.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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>
(cherry picked from commit b796fcd1bf2978aed15748db04e054f34789e9eb)
[BR: BSC#1015048]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/virtio/virtio.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index e0c99c3f28..190ef057b7 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -71,6 +71,9 @@ struct VirtQueue
     VRing vring;
     hwaddr pa;
     uint16_t last_avail_idx;
+
+    uint16_t used_idx;
+
     /* Last used index value we have signalled on */
     uint16_t signalled_used;
 
@@ -186,6 +189,7 @@ static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val)
     hwaddr pa;
     pa = vq->vring.used + offsetof(VRingUsed, idx);
     virtio_stw_phys(vq->vdev, pa, val);
+    vq->used_idx = val;
 }
 
 static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
@@ -277,7 +281,7 @@ void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
 
     virtqueue_unmap_sg(vq, elem, len);
 
-    idx = (idx + vring_used_idx(vq)) % vq->vring.num;
+    idx = (idx + vq->used_idx) % vq->vring.num;
 
     /* Get a pointer to the next entry in the used ring. */
     vring_used_ring_id(vq, idx, elem->index);
@@ -290,7 +294,7 @@ void virtqueue_flush(VirtQueue *vq, unsigned int count)
     /* Make sure buffer is written before we update index. */
     smp_wmb();
     trace_virtqueue_flush(vq, count);
-    old = vring_used_idx(vq);
+    old = vq->used_idx;
     new = old + count;
     vring_used_idx_set(vq, new);
     vq->inuse -= count;
@@ -628,6 +632,7 @@ void virtio_reset(void *opaque)
         vdev->vq[i].vring.used = 0;
         vdev->vq[i].last_avail_idx = 0;
         vdev->vq[i].pa = 0;
+        vdev->vq[i].used_idx = 0;
         vdev->vq[i].vector = VIRTIO_NO_VECTOR;
         vdev->vq[i].signalled_used = 0;
         vdev->vq[i].signalled_used_valid = false;
@@ -874,7 +879,7 @@ static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
     v = vq->signalled_used_valid;
     vq->signalled_used_valid = true;
     old = vq->signalled_used;
-    new = vq->signalled_used = vring_used_idx(vq);
+    new = vq->signalled_used = vq->used_idx;
     return !v || vring_need_event(vring_used_event(vq), new, old);
 }
 
@@ -1112,6 +1117,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
                              vdev->vq[i].last_avail_idx, nheads);
                 return -1;
             }
+            vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]);
         }
     }