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Re: [Qemu-block] coroutines: block: Co-routine re-entered recursively wh

From: Paolo Bonzini
Subject: Re: [Qemu-block] coroutines: block: Co-routine re-entered recursively when migrating disk with iothreads
Date: Thu, 9 Jun 2016 10:25:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

On 09/06/2016 09:35, Stefan Hajnoczi wrote:
>     if (s->dataplane) {
>         virtio_blk_data_plane_stop(s->dataplane);
>     }
>     virtio_save(vdev, f);
> }
> We reach the situation I described where BDS AioContext changes but
> mirror_run() is still in the IOThread AioContext.

Why is the virtio_blk_data_plane_stop necessary?  It used to sync
between vring and virtio state, but that's not required anymore---and we
know that the virtqueues are quiescent at this point...


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