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virtio: basic packed virtqueue support

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This patch implements basic support for the packed virtqueue. Compare
the split virtqueue which has three rings, packed virtqueue only have
one which is supposed to have better cache utilization and more
hardware friendly.

Please refer virtio specification for more information.

Signed-off-by: Wei Xu <wexu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20191025083527.30803-6-eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2019-10-25 10:35:24 +02:00 • committed by Michael S. Tsirkin
parent 522bbb191c
commit 86044b24e8
5 changed files with 832 additions and 78 deletions
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2
hw/char/virtio-serial-bus.c
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@ -708,7 +708,7 @@ static void virtio_serial_save_device(VirtIODevice *vdev, QEMUFile *f)
if (elem_popped) {
qemu_put_be32s(f, &port->iov_idx);
qemu_put_be64s(f, &port->iov_offset);
qemu_put_virtqueue_element(f, port->elem);
qemu_put_virtqueue_element(vdev, f, port->elem);
}
}
}