ProxMox VM: cannot create VM's in it: KVM error

Discussions about using Linux guests in VirtualBox.
Post Reply
jpflathead
Posts: 6
Joined: 9. Oct 2016, 16:14
Primary OS: MS Windows other
VBox Version: OSE other
Guest OSses: Debian Windows

ProxMox VM: cannot create VM's in it: KVM error

Post by jpflathead »

I have a Windows10 and a Windows11 machine (my new pc).
On both I have the latest version of VirtualBox 6.1.36. On both I have a ProxMox VM. Configuration is the same.
On W10 I can create and run a VM in Proxmox, on W11 I get the error wile starting a VM "KVM not installed or configured in the bios".
The new machine is an AMD5700-X, the old one an I7-6400.
Who is causing the error? W11?
And how can this be fixed?
Oh, and ProxMox is also the latest version 7.2-7
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: ProxMox VM: cannot create VM's in it: KVM error

Post by scottgus1 »

jpflathead wrote:I have the latest version of VirtualBox 6.1.36. On both I have a ProxMox VM. Configuration is the same.
On W10 I can create and run a VM in Proxmox
So you're doing nested virtualization? Windows > Virtualbox > Proxmox > something > another VM?
jpflathead wrote:on W11 I get the error wile starting a VM "KVM not installed or configured in the bios".
I'll wager that Hyper-V is enabled in 11. Do you see the green turtle Image in the status bar in the first layer Virtualbox VM? If so, see HMR3Init: Attempting fall back to NEM (Hyper-V is active).
Winston123
Posts: 1
Joined: 15. Apr 2023, 17:55

Re: ProxMox VM: cannot create VM's in it: KVM error

Post by Winston123 »

There is an extra step required in Win11 to completely disable Hyper-V.

In addition to all the stuff you have to disable in Win10, in Win11 you also have to disable core isolation memory integrity.

Settings > Privacy & security > Windows security > Device security > Core isolation details > Turn Memory integrity OFF
scottgus1
Site Moderator
Posts: 20965
Joined: 30. Dec 2009, 20:14
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Windows, Linux

Re: ProxMox VM: cannot create VM's in it: KVM error

Post by scottgus1 »

Turning Memory integrity off is mentioned in the linked tutorial.
Post Reply