Re: [Qemu-devel] [PATCH 00/10] block: AioContext management, part 1

[Kevin Wolf]

Am 06.05.2019 um 19:17 hat Kevin Wolf geschrieben:
> Recently, a few bugs were reported that resulted from an inconsistent
> state regarding AioContexts. Block nodes can end up in different
> contexts than their users expect - the AioContext of a node can even
> change under the feet of a device with no way for the device to forbid
> this. We recently added a few basic checks to scsi-disk and virtio-blk,
> but they are by far not enough.
> 
> This is the first part of my work to actually properly manage
> AioContexts in the block layer rather than just doing some ad-hoc calls
> to bdrv_set_aio_context() and hoping that everything will work out.
> 
> The goal of this first part is that bdrv_set_aio_context() propagates
> the AioContext change not only to the children of the node like we
> already do, but also to any other affected nodes, such as additional
> parents or nodes connected to the requested one only through a block job
> that operates on both nodes.
> 
> Keep in mind that a second part will follow and that this is visible in
> some functions that may not seem that useful in this series. In
> particular, bdrv_try_set_aio_context() isn't used much outside of test
> cases in this series. This will change in the second part.

Applied to the block branch.

Kevin