Windows 11 hangs with 100% CPU usage

mijanek

Active Member
Sep 3, 2013
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Hey, thats exactly the same issue I have running Windows 2022 with HyperV feature enabled. This simply does not work on AMD, it freezes soon or later. However I was able to run HyperV on Core Installation (without Desktop Experience) which is unfortunatelly no sollution for your Windows 11. Did you have allready tried to disable Windows Defender and process Isolation features?
 
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Krullix

New Member
Jan 31, 2022
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Hey, thats exactly the same issue I have running Windows 2022 with HyperV feature enabled. This simply does not work on AMD, it freezes soon or later. However I was able to run HyperV on Core Installation (without Desktop Experience) which is unfortunatelly no sollution for your Windows 11. Did you have allready tried to disable Windows Defender and process Isolation features?
I don't think the issue is in the guest OS level. It doesn't BSOD so there is no kernel level fault occurring, the system also does not respond to interrupts like ctrl-alt-del and the proxmox console only shows a black screen and does not respond to power state commands. I assume it is an issue with nested virtualization in the guest VM hardware level.

I'm going to remove the Hyper-V feature and see if the issue continues (Not really a workaround since KVM64 seems stable and is the same end state with no nested virtualization to run features like wsl2.)
 

mijanek

Active Member
Sep 3, 2013
86
6
28
The black screen is becouse of your power management setting. If you disable to switch off the display you will see, that the os freezes and does not react to any input. There seems to be some constrain in the UI version running HyperV nested in Proxmox on AMD CPU..
The Server 2022 Core installation works smooth and even really quick without any issue.

See my post here:

https://forum.proxmox.com/threads/windows-server-2022-with-hyperv-is-freezing.103917/
 

Krullix

New Member
Jan 31, 2022
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Same issue just happened after removing Hyper-V from Windows 11. System stopped responding CPU use went to 100% when using Host CPU. Going back to KVM64 for now.
 

mijanek

Active Member
Sep 3, 2013
86
6
28
Windows 11 uses enhanced Hardware Security. One of them is the "Core Isolation" which is virtualisation-based security. So it must not be the HyperV only causing this issue on AMD CPU, but maybe this too.
Changing the CPU Arch to KVM removs the virtualisation capability of the CPU from the guest. So if you do not need any nested virtualisation and you don't like to deal to find out what's causing this, is this the best sollution in my opinion.
 
Dec 13, 2021
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I've been updating my AMD machine whenever a new kernel comes along and Windows 11 with virtualization enabled is no longer hanging. Has this been fixed?

I've not been paying enough attention with all the new kernels being launched in the past months but something recently launched must has fixed the AMD issues! I've been updating Win11 as well, so not sure what fixed it.
 
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