Re: [Qemu-devel] [PATCH v5 0/3] virtio-scsi: restart DMA after iothread

[Kevin Wolf]

Am 20.06.2019 um 19:37 hat Stefan Hajnoczi geschrieben:
> v5:
>  * Plumbing vm change state handlers into DeviceClass/BusClass is a rather
>    large bug fix.  Instead I've combined the previous priorities approach with
>    the observation from Kevin and Paolo that we really want to order by qdev
>    tree depth.
> 
>    The new qdev_add_vm_change_state_handler() API lets DeviceStates register
>    callbacks that execute in qdev tree depth order.  This solves the
>    virtio-scsi bug since the virtio-scsi device's callback must complete 
> before
>    its child scsi-disk's callback runs.
> 
>    Is this a good compromise for everyone?

I'd still call it a hack, but I can also see that doing the real thing
would be a lot of work that might not be worth the effort.

Thanks, applied to the block branch.

Kevin