Re: [Qemu-devel] [PATCH v4 1/6] vfio-ccw: make it safe to access channel programs

Cornelia Huck
2019-04-12T08:14:30Z

On Thu, 11 Apr 2019 17:27:42 -0400
Eric Farman <farman@linux.ibm.com> wrote:

> On 4/10/19 10:59 PM, Eric Farman wrote:
> >
> >
> > On 4/9/19 7:34 PM, Halil Pasic wrote:
> >> On Mon, 8 Apr 2019 19:07:47 +0200
>
> ...snip...
>
> >> I'm just running fio on a pass-through DASD and on some virto-blk disks
> >> in parallel. My QEMU is today's vfio-ccw-caps from your repo.
> >>
> >> I see stuff like this:
> >> qemu-git: vfio-ccw: wirte I/O region failed with errno=16[1811/7332/0
> >> iops] [eta 26m:34s]
> >
> > Without knowing what the I/O was that failed, this is a guessing game.
> > But I encountered something similar just now running fio.
> >
> > qemu:
> > 2019-04-11T02:06:09.524838Z qemu-system-s390x: vfio-ccw: wirte I/O
> > region failed with errno=16
>
> ...snip...
>
> > From the associated I/O, I think this is fixed by a series I am nearly
> > ready to send for review.  I'll try again with those fixes on top of the
> > two series here, and report back.
>
> So, I've run enough combinations to feel comfortable saying that the
> error (EBUSY) I saw last night (and presumably the one Halil saw) exists
> in today's code and is not introduced by this series. It also appears
> to be addressed by one of the patches in a series I'm working on, but
> which that series still has some further problems. Sigh, there are too
> many branches and too many interrupts.

Great, thanks for checking! I know that feeling of being tangled in too
many branches...