[vfio-users] AMD + Nvidia + WIn 8.1 + hv_vendor_id + QEMU GIT == hang on boot

[David Sutton]

Aaron,

On Sun, Nov 8, 2015 at 5:13 AM, Aaron Campbell <aaron at arbor.net> wrote:

> > On Nov 7, 2015, at 8:44 PM, David Sutton <kantras at gmail.com> wrote:
> >
> > All,
> >
> >   After watching the list and seeing the hv_vendor_id patch, I decided
> to try and see if it would help with my setup; This system is running Arch
> ( linux-lts 4.1.12 kernel ) on an AMD FX-8350, an Nvidia 780 being passed
> through to a Windows 8.1 Pro guest.
> >
> >   I installed the qemu-git package, created a wrapper script to update
> the options
> "host,kvm=off,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff,hv_vendor_id=vendor"
> and tried to boot. It passed through the OVMF boot screen to the Windows
> loading screen, and then seems to hang (dots stop rotating) with 100% CPU
> usage showing under VMM.
>
>
> Our h/w is different (Intel Haswell, GTX 970 here), but when I had this
> problem with qemu 2.4 and Win 8.1, a kernel downgrade to 4.0.4-301.fc22
> (Fedora) fixed it.  Prior to this I had tried 4.1.6-200.fc22,
> 4.2.3-300.fc22, and 4.3.0 final (released just a week or so ago), and all
> hung in this way (dots stop rotating).  Unfortunately I haven’t had time to
> bisect or narrow down the exact kernel release where this regressed., but
> apparently it was somewhere between 4.0.4 and 4.1.6.  So I have been stuck
> on 4.0.4 since.
>
>
Thanks for the suggestion - I still had a 4.0.7 package available in my
cache so tried downgrading to it, but the same hang is occuring when I try
and boot it up.


> Is anyone aware of any suspect or problematic KVM changes to the kernel
> between these releases that I may look into?
>
> -Aaron


Regards,

  David
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