Re: [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO"

[Paolo Bonzini]

On 28/05/2015 04:49, Fam Zheng wrote:
> 
> On a second thought, although in this series, we only need to modify
> virtio-{scsi,blk}, Wen pointed out that mirror job also wants this during
> completion (because bdrv_swap is in a BH after the job coroutine returns).

Mirror needs to pause/resume the source.  It doesn't need to handle
pause/resume of the target, does it?

> So, in order for the solution to be general, and complete, this nofitier list
> approach relies on the listening devices to do the right thing, which requires
> modifying all of them, and is harder to maintain.

Isn't it only devices that use aio_set_event_notifier for their ioeventfd?

Paolo