Hi Salvatore, Thanks for the quick reply!
> > > > This sounds similar to the > > https://forum.proxmox.com/threads/with-latest-5-15-104-1-pve-windows-server-vm-freeze-stuck.125294/ > > issue. Would you be able to verify two things: > > > > Check how the Windows VM is configured and if you pass the > > '+hv-tlbflush' flag. > > You're right, I am passing this flag. In libvirt I use: <domain> <features> <hyperv> <tlbflush state='on'/> </hyperv> </features> </domain> I tried this fix first and it works. If I reboot into 5.10.0-22-amd64, and instead set <tlbflush state='off'/> above, the VM boots. > > Additionally, would the attached patch make the issue go away? Thanks for the patch; it does fix the issue. I set this back: <tlbflush state='on'/>, applied your patch to 5.10.0-22-amd64 and booted my newly patched kernel, and the VM boots. > > > Now with patch attached. > > Regards, > Salvatore Thanks for your help. This is my first time using the BTS so I hope I've done everything correctly. If there's anything else I should do, or if you want me to test something, let me know. Jared