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Ladi Prosek authored
According to the spec, if the VIRTIO_RING_F_EVENT_IDX feature bit is negotiated the driver MUST set flags to 0. Not dirtying the available ring in virtqueue_disable_cb also has a minor positive performance impact, improving L1 dcache load missed by ~0.5% in vring_bench. Writes to the used event field (vring_used_event) are still unconditional. Cc: Michael S. Tsirkin <mst@redhat.com> Cc: <stable@vger.kernel.org> # f277ec42 virtio_ring: shadow available Cc: <stable@vger.kernel.org> Signed-off-by:
Ladi Prosek <lprosek@redhat.com> Signed-off-by:
Michael S. Tsirkin <mst@redhat.com>
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