Arch Linux

Kody

Member

Registered: 2018-03-13

Posts: 8

[Solved] Recent update breaks kvm/qemu

I am running a windows 10 VM with pci passthrough using the VFIO LTS kernal with the ACS override patch using the methods described on the PCI passthrough via OVMF page.
After doing an arch system update on March 18th the windows VM does not work, when I attempt to start it, it immediatly uses 100% cpu on one thread and has no disk i/o to the vioscsi disk that is passed to it.

After downgrading all arch system packages to what was available on March 01 the problem went away.
It seems like many components of this have their own logs and I am not sure which ones would be relevant to this problem.
Does this symptom sound familiar to anyone?
Can anyone point me in the right direction for troubleshooting this?

Last edited by Kody (2018-04-13 02:16:41)

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 13,225

Re: [Solved] Recent update breaks kvm/qemu

to many possible causes.

Try upgrading packages one-day-at-a-time by using ALA snapshots , https://wiki.archlinux.org/index.php/Arch_Linux_Archive .
That should help to reduce the number of package updates involved.

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Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

clean chroot building not flexible enough ?
Try clean chroot manager by graysky

dpayne

Member

Registered: 2014-10-23

Posts: 13

Re: [Solved] Recent update breaks kvm/qemu

I had a similar issue, I fixed it by downgrading the ovmf package. The discord channel for VFIO helped out with a solution.

anatolik

Developer

Registered: 2012-09-27

Posts: 458

Re: [Solved] Recent update breaks kvm/qemu

It is really puzzles me why recent ovmf update breaks the installation. The recent PKGBUILD change added `-D FD_SIZE_2MB` compilation flag used in other distros (e.g. Fedora).

Or maybe guest OS saved settings that are not compatible with the new firmware?

It would be really great if you folks contacted OVMF developers (https://lists.01.org/mailman/listinfo/edk2-devel). They will be able to help you to debug this problem.

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Read it before posting http://www.catb.org/esr/faqs/smart-questions.html
Ruby gems repository done right https://bbs.archlinux.org/viewtopic.php?id=182729
Fast initramfs generator with security in mind https://wiki.archlinux.org/index.php/Booster

Kody

Member

Registered: 2018-03-13

Posts: 8

Re: [Solved] Recent update breaks kvm/qemu

Thank you all for the responses.
I ended up just blocking the OVMF package from updating in my pacman.conf.
That seems to work for now, ill try updating OVMF later when I have some time to figure out why it wasn't working.