Re: PROBLEM: Regression of MMU causing guest VM application errors

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On Thu, Oct 24, 2019 at 11:18:59AM -0400, Derek Yerger wrote:
> On 10/22/19 4:28 PM, Sean Christopherson wrote:
> >On Thu, Oct 17, 2019 at 07:57:35PM -0400, Derek Yerger wrote:
> >Heh, should've checked from the get go...  It's definitely not the memslot
> >issue, because the memslot bug is in 5.1.16 as well.  :-)
> I didn't pick up on that, nice catch. The memslot thread was the closest
> thing I could find to an educated guess.
> >>I'm stuck on 5.1.x for now, maybe I'll give up and get a dedicated windows
> >>machine /s
> >What hardware are you running on?  I was thinking this was AMD specific,
> >but then realized you said "AMD Radeon 540 GPU" and not "AMD CPU".
> Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
> 
> 07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
> Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] (rev c7)
>         Subsystem: Gigabyte Technology Co., Ltd Device 22fe
>         Kernel driver in use: vfio-pci
>         Kernel modules: amdgpu
> (plus related audio device)
> 
> I can't think of any other data points that would be helpful to solving
> system instability in a guest OS.

Can you bisect starting from v5.2?  Identifying which commit in the kernel
introduced the regression would help immensely.

> But given my troubleshooting before, it
> looks like presence/absence of a PCI passthrough device is inconsequential
> to whether the problem is occurring.
> 
> I may have to try out other VMs or a fresh windows guest.



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