Re: [Qemu-devel] [PATCH 00/12] virtio: cleanup ioeventfd start/stop

[Cornelia Huck]

On Mon, 10 Oct 2016 13:53:28 +0200
Paolo Bonzini <address@hidden> wrote:

> This series started as an attempt to always use the dataplane path
> for virtio-blk and virtio-scsi when ioeventfd is active.  The aim
> was three-fold:
> 
> 1) to add more coverage for dataplane
> 
> 2) to remove virtio_add_queue_aio
> 
> 3) to simplify the dataplane start/stop code
> 
> It achieves the first two objectives, and while it doesn't quite
> achieve the third it does cleanup the generic ioeventfd code in
> virtio-bus more than I expected.  In particular, it reduces the set
> of callbacks that transports must implement, and it removes the ugly
> case where ioeventfd is started with generic callbacks and then moved
> to the dataplane callbacks.  It also enables some simplification of the
> functions that deal with host notifiers, and detects some configuration
> errors better.
> 
> I've tested it with virtio-blk, virtio-scsi and vhost-net.

Hm. 'make check' on a s390 host faults in check-qtest-aarch64 (your
branch rebased to current master; master itself is fine). I'll see if I
can find out more (probably later today).