Re: [PATCH 0/2] Fix vfio-ccw handling of TIC recursion

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On Fri, 22 Feb 2019 19:39:39 +0100
Eric Farman <farman@xxxxxxxxxxxxx> wrote:

> Per the discussion [1] about a problem with how vfio-ccw calculates
> the length of a channel program (specifically when using the
> forthcoming QEMU BIOS code for DASD IPL), I present this fix.
> 
> Patch 1 fixes the problem, and is over-engineered
> for readability sake.

:)

> 
> Patch 2 takes the functions from Patch 1, and refactors the
> existing code to make other areas a little easier to understand.
> (I hope.)
> 
> I've been running fio for over 24 hours now, and have seen
> zero hours.  Previously, I would have probably seen "a few"
> errors by now, where prior to the original fix I would've seen
> "many" errors.  Further tests are still ongoing.

Awesome, thanks!

> 
> [1] https://marc.info/?l=linux-s390&m=155063096321940&w=2
> 
> Eric Farman (2):
>   s390/cio: Fix vfio-ccw handling of recursive TICs
>   s390/cio: Use cpa range elsewhere within vfio-ccw
> 
>  drivers/s390/cio/vfio_ccw_cp.c | 55 ++++++++++++++++++++++++++++++++----------
>  1 file changed, 42 insertions(+), 13 deletions(-)
> 

I hope we can queue the patches soon, reviewing now.




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