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

[nicolas prochazka]

Hello,
I'm just add
{ PCI_VENDOR_ID_INTEL, 0x9d70, pci_quirk_mf_endpoint_acs },
in drivers/pci/quirks.c   for the sound card on intel nuc skylake.
This issues is present on broadwell, but it's very strange behaviour
because it depends how the windows igd drivers seems to be installed.
I'm trying to investigate, now i known there's no vfio modification in
kernel code
Regards,
Nicolas

2016-10-06 17:56 GMT+02:00 Alex Williamson <address@hidden>:

> 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
>