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Tasklist

FS#72986 - [linux] VM freezes starting with kernel 5.15

Attached to Project: Arch Linux
Opened by th3voic3 (th3voic31) - Sunday, 12 December 2021, 12:23 GMT
Last edited by Toolybird (Toolybird) - Monday, 29 May 2023, 05:01 GMT
Task Type Bug Report
Category Packages: Core
Status Closed
Assigned To Jan Alexander Steffens (heftig)
Architecture All
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
Hi,

starting with kernel 5.15 I'm experiencing freezes in my VFIO Windows 10 VM.
Downgrading to 5.14.16 fixes the issue.

I can't find any error messages in dmesg when this happens and comparing the dmesg output between 5.14.16 and 5.15.7 didn't show any differences.


Additional info:
* 5.15.x
* I'm attaching my libvirt config and my /etc/libvirt/hooks/qemu
* My specs are:
** i7-10700k
** ASUS z490-A PRIME Motherboard
** 32 GB RAM
** Passthrough Card: NVIDIA 2070 Super
** Host is using the integrated Graphics chip

Steps to reproduce:
Boot any 5.15 kernel and start the VM and after some time (no specific trigger as far as I can see) the VM freezes.
   qemu.hook (4.1 KiB)
   win10.xml (9.7 KiB)
This task depends upon

Closed by  Toolybird (Toolybird)
Monday, 29 May 2023, 05:01 GMT
Reason for closing:  Fixed
Additional comments about closing:  See comments
Comment by th3voic3 (th3voic31) - Sunday, 12 December 2021, 12:24 GMT
I actually got 64GB RAM just passing through 32GB.
Comment by th3voic3 (th3voic31) - Monday, 27 December 2021, 20:01 GMT
I might have found a solution, but it's confusing me a little.

I read about this:
20210713142023.106183-9-mlevitsk@redhat.com/#24319635"> https://patchwork.kernel.org/project/kvm/patch/20210713142023.106183-9-mlevitsk@redhat.com/#24319635

And so I checked
cat /sys/module/kvm_intel/parameters/enable_apicv

which returns Y to me by default.

So I added
options kvm_intel enable_apicv=0
to /etc/modprobe.d/kvm.conf


cat /sys/module/kvm_intel/parameters/enable_apicv
now returns N

So far I haven't encountered any freezes.

The confusing part is that APICv shouldn't be available with my CPU.

Still need to do some long-term testing.
Comment by th3voic3 (th3voic31) - Wednesday, 29 December 2021, 17:03 GMT
Had a long testing session. No freezes.
Comment by th3voic3 (th3voic31) - Thursday, 06 January 2022, 11:06 GMT
I mirrored this bug upstream:
https://bugzilla.kernel.org/show_bug.cgi?id=215459
Comment by th3voic3 (th3voic31) - Monday, 10 January 2022, 16:59 GMT
Tested 5.16 and it's fixed there.

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