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@xxxxxxxxxxxxxxxxxxxx Reporter: th3voic3@xxxxxxxxxxx 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@xxxxxxxxxx/#24319635"> https://patchwork.kernel.org/project/kvm/patch/20210713142023.106183-9-mlevitsk@xxxxxxxxxx/#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 -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
