[vfio-users] GPU passthrough errors with linux 5.1 and newer

[wiwitop wiwitop]

FYI
https://passthroughpo.st/psa-5-1-kernel-glitching-and-crashes-in-passthrough/


Le mer. 31 juil. 2019 à 15:42, José Ramón Muñoz Pekkarinen <
koalinux at gmail.com> a écrit :

> On Sun, 21 Jul 2019 at 21:59, Zoltán Kővágó <dirty.ice.hu at gmail.com>
> wrote:
> >
> > Hi,
> >
> > Recently my previously perfectly working GPU passthrough setup (with a
> > win8.1 x64 guest with OVMF) started to malfunction in various ways:
> > screen randomly turned off for a few seconds, BSOD with
> > VIDEO_TDR_FAILURE, 3d apps randomly crashing, not drawing the windows'
> > content, and graphical glitches (for example in furmark the OSD text
> > flickers).
> >
> > After fiddling around with various qemu versions, nvidia driver versions
> > on the guest, I figured out that with a linux 5.0 kernel it works fine,
> > but with 5.1 it randomly fails. I bisected it and it looks like the
> > culprit is the commit 4e103134b862 "KVM: x86/mmu: Zap only the relevant
> > pages when removing a memslot"[1]. I tried to revert in on top of 5.2.1
> > but too many things changed in the meantime. Anyway, if I replace the
> > body of kvm_mmu_invalidate_zap_pages_in_memslot with
> > kvm_mmu_zap_all(kvm); it works again (probably with horrible performance
> > degradation).
> >
> > Did anyone experience anything like this? I'm using Alex's ACS override
> > patch, maybe it violates some assumption that the new code has?
>
>     Hi,
>
>     I noticed some changes that made 5.0 not working well when
> detecting screen speakers through hdmi, but this I didn't see anytime.
> My problem flew away with 5.1.15(the one I currently use), and no
> other spread. I never needed the ACS override patch in my setup,
> what happen if you try without it, does your groups comes wrong in
> any ways?
>
>     Best regards.
>
>     José.
>
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