[Bug 215459] New: VM freezes starting with kernel 5.15

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215459

            Bug ID: 215459
           Summary: VM freezes starting with kernel 5.15
           Product: Virtualization
           Version: unspecified
    Kernel Version: 5.15.*
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: th3voic3@mailbox.org
        Regression: No

Created attachment 300234
  --> https://bugzilla.kernel.org/attachment.cgi?id=300234&action=edit
qemu.hook and libvirt xml

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
** 64 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.

After some testing the solution seems to be:

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

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