New Windows 11 VM Fails Boot After Update

[tofi]

I fixed it thanks to some other infos here from the forums.

Solution for me:

vm.conf
args: -cpu host,hv_passthrough,level=30,-waitpkg
(remove "cpu:" info line)

set /sys/module/kvm/parameters/ignore_msrs to Y

• temporary

echo "Y" > /sys/module/kvm/parameters/ignore_msrs

• persistent

echo "options kvm ignore_msrs=1" >> /etc/modprobe.d/kvm.conf
modprobe -r kvm
modprobe kvm


Sources:
https://forum.proxmox.com/threads/w...n-windows-guest-on-13th-gen-intel-cpu.131950/
https://pve.proxmox.com/wiki/Nested_Virtualization#Troubleshooting

Thanks everyone