Windows 11 KVM processor not supported

[Frigg]

Hello,
The Common KVM processor is not supported by Windows 11.
Do you know if it will be supported?
If not, what is the alternative?
In advance, thank you for your help
Hervé

 

[t.lamprecht]

Hi,

what do you mean? I use a processor with kvm64,flags=+md-clear;+pcid;+spec-ctrl;+ssbd;+aes (the flags was choosen due to my Intel based host CPU, they're not all required) just fine here on pve-no-subscription package version state.

Note that you really need to give the VM at least 4 GiB of memory and more than ~ 58 GiB of disk space, else Windows 11 installation will fail without really telling you why it did so.

 

[Frigg]

Hello THomas,
I mean it isn't possible to get the upgrade to windows 11 on a virtual machine using Common KVM porcessor: when you use Microsoft PC integrity check, some requirements are lacking, preventing upgrade.

 

[czechsys]

Use processor type Host.

 

[Frigg]

THanck you czechsys,
I came to the same solution. But it hurts the portability of the VM. This could be a problem if going back to a KVM processor was not supported.
I will do some tests..

 

[Frigg]

Hello, I 've tried to change VM's processor to host, but OVMF (UEFI) boot failed in a loop and there is no access to it. What can I do ?

 

[Frigg]

The problem is that I was not in version 7.
For those who are in the same case, you have to use a contournament solution.
The easiest one I found : https://www.youtube.com/watch?v=2ka9hGBOFmo&list=LL&index=5

 

[kromberg]

Anyone know the CPU type that should be used for Windows 11. The proxmox host has E5-2680v3 cups installed and setting the guest to either host, kvm64, or qemu64 causes the windows 11 cpu check to fail for unsupported cpu type.

 

[Frigg]

Just use the contournament methode on the youtube like above, or update proxmox to version 7

 

[kromberg]

Just use the contournament methode on the youtube like above, or update proxmox to version 7

I am running version 7.1

 

[Frigg]

Contournament solution should work.
If you d'ont want to do this, post a new thread. This way you should get answer from proxmox team.

 

[altano]

The youtube video was taken down ("This video has been removed by the uploader").

Anyone have any advice? I'm on Proxmox 7.1-10 and I tried Default, KVM64, and host for CPU. All give me the same error about "Common KVM Processor" being unsupported.

 

[kromberg]

I ended having to do the iso modification where you delete the requirements checker ddl file, build the iso, and then install Windows 11. I used the default KVM64 cpu type.

 

[Frigg]

Hello Altano
You can download it here https://HdM38b05Xq7fDNFro18.quickco.../ixHkOONdFMIYIBoKlhq64rxjG6yKbyAJ-TN0ATJ05Qwk
Mainly, delete appraiserres.dll from the intall files, and when installing windows, untick check for updates. Updates will be installed after running windows 11.

 

[altano]

Wow that's a pretty intense workaround. Thanks for providing it but I think I'll sit out this upgrade for now.

 

[Barsoom]

Doesn't like "host" for my not-the-latest processor. And doesn't like "kvm64".

But is happy with "qemu64"!

 

[oemb1905]

Doesn't like "host" for my not-the-latest processor. And doesn't like "kvm64".

But is happy with "qemu64"!

View attachment 36029

Same issue, host not compatible with Windows 11, but the qemu64 worked. I did have to start the VM, then reboot it, however, for it to recognize the new cpu.