[vfio-users] 1 GB hugepages cause host crash on guest shutdown with some GPUs

[Okky Hendriansyah]

On December 9, 2015 at 04:50:18, Hristo Iliev (hristo at hiliev.eu) wrote:
...
With linux-vfio-lts I can reboot the host at any time and the VM always 
boots ok afterwards, even if the host was running linux-lts and the VM was 
hanging before the reboot. So, a more complete version of the above scenario 
looks like this: 
...
I just performed a series of experiments and the latter scenario repeats 
100% reliably. Both linux-vfio-lts and linux-lts are based on the 4.1.13 
kernel. The VM is 64-bit Windows 10. 
As far as I know, the differences between linux-lts and linux-vfio-lts package are (I hope Dan can confirm this?):

1. Intel HD VGA Arbitration patch and PCIe ACS Override patch

2. config and config.x86_64 files

Probably there’re some kernel config in linux-lts that made the OVMF hang in your setup?

I've noticed that whenever the VM hangs, qemu spits seven times the 
following: 

ehci: PERIODIC list base register set while periodic schedule 
is enabled and HC is enabled 
...
What happens if you do not passthrough any host USB. If you have one, try passing through a whole USB PCIe Controller?

...
That's exactly what I'm doing - answering positively to the question 
whether it should build the three packages at once. Despite that, it still 
wants to build the headers package again afterwards, regardless of the 
fact that linux-vfio-lts-headers was created and installed during the 
previous step. 
Another alternative is to use Mark Weimann’s repository [1] to install a precompiled version of linux-vfio and linux-vfio-lts kernel package.


[1] https://wiki.archlinux.org/index.php/Unofficial_user_repositories#markzz

-- 
Okky Hendriansyah

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