[vfio-users] Question about IGD Passthrough

[Alex Williamson]

On Jun 21, 2016 4:15 AM, "YounJae Rho" <luxflow at live.com> wrote:
>
> I already compiled both upstream qemu (http://git.qemu.org/ 2016-06-17)
and seabios (http://git.qemu.org/seabios.git 2016-06-03)
>
>
>
> After disable intel graphic driver at safe mode in windows 10 guest
>
> I can boot windows normally, but whenever I re-enable intel graphic
driver. It crashes
>
> I analyzed windows crash log with windbg. And I found that error
SYSTEM_THREAD_EXCEPTION_NOT_HANDLED  is occurred when igdkmd64.sys execute
instruction `rdmsr` to read MSR_TURBO_RATIO_LIMIT(0x1ad) which is not
handled in qemu
>
> (host dmesg says  vcpu6, guest rIP: 0xfffff80137691453 unhandled rdmsr:
0x1ad)
>
> Since Ubuntu guest successfully booted. I suspect windows 10 intel
graphic driver
>
> I already update latest intel graphic driver from intel web site
(version 20.19.15.4463)
>
>
>
> Do you have any idea about it? Or can you let me know what’s your test
environment (intel graphic driver version, qemu version, seabios version..
etc)

modprobe.d:
options kvm ignore_msrs=1
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