Re: [Qemu-devel] vfio/pci: IGD assignment

[Alex Williamson]

On Thu, 6 Oct 2016 08:06:24 +0200
nicolas prochazka <address@hidden> wrote:

> Hello,
> Since I upgrade my linux kernel from linux 4.8rc1 to 4.8.0, I can observe
> regression with VFIO/PCI IGD Assignment .
> All works very well with linux 4.8rc1 ( broadwell/skylake cpu + win10 guest
> / Linux Guest ) .
> Since linux 4.8.0, Windows guest screen is a " blink pixel , multi color
> blink , a matrix revisited.
> 
> Only linux kernel change between two test,
> no log in qemu or dmesg.
> 
> Is there modification to vfio in kernel between 4.8rc1 and 4.8.0 ? , can i
> test something.

Hmm, I was running 4.8-rc5 on my system, I upgraded to v4.8 and it
still works.  There's only one change in drivers/vfio from rc1 to 4.8:

$ git log --oneline v4.8-rc1..v4.8 drivers/vfio
c8952a7 vfio/pci: Fix NULL pointer oops in error interrupt setup handling

I notice you're also assigning device 1f.3, which means you're using
the acs override patch, which means you're not running a stock v4.8.
Thanks,

Alex