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vhost: Delete useless read memory barrier

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As discussed in previous series [1], this memory barrier is useless with
the atomic read of used idx at vhost_svq_more_used. Deleting it.

[1] https://lists.nongnu.org/archive/html/qemu-devel/2022-07/msg02616.html

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-08-23 20:30:28 +02:00 • committed by Jason Wang
parent 86f5f2546f
commit 9e193cec5d
1 changed files with 0 additions and 3 deletions
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3
hw/virtio/vhost-shadow-virtqueue.c
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@ -509,9 +509,6 @@ size_t vhost_svq_poll(VhostShadowVirtqueue *svq)
if (unlikely(g_get_monotonic_time() - start_us > 10e6)) {
return 0;
}
/* Make sure we read new used_idx */
smp_rmb();
} while (true);
}