Issues with nested virtualization on AMD Ryzen 7 CPU

[breaker_]

Hey All,

I've set up ProxMox running on my home PC using VMware Workstation. I have a Ryzen 7 3800x CPU. I've got all the storage set up and everything, but I am running into big problems trying to start my VM (Windows 10).

I have already edited the configuration file for the VM and set the args: -cpu host, +svm. I have also enabled nested virtualization on the kernel and restarted via modprobe.

I have enabled virtualization of CPU performance counters on the actual ProxMox host VM as well. I also set the CPU type of the Windows 10 VM to 'host'.

Whenever I try to start the VM, I get the same error:

kvm: error: failed to set MSR 0xe1 to 0x0
kvm: /build/pve-qemu/pve-qemu-kvm-5.0.0/target/i386/kvm.c:2695: kvm_buf_set_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
TASK ERROR: start failed: QEMU exited with code 1

This is driving me insane. If someone could please help I would appreciate it.

 

[breaker_]

Also tried:

qm set ID -machine pc-q35-2.6 and it applied successfully, but had no effect....VM still fails to boot

 

[mcdull]

you need to expose nested virtualization in your windows host, which could be an issue.
Also vmx seems to be Intel, svm for AMD.

 

[breaker_]

you need to expose nested virtualization in your windows host, which could be an issue.
Also vmx seems to be Intel, svm for AMD.

My apologies. That was a typo. I did specify svm, instead of vmx.

 

[mcdull]

nested vm in AMD and windows is very new indeed
https://techcommunity.microsoft.com/t5/virtualization/amd-nested-virtualization-support/ba-p/1434841

You will have a better luck if your host being proxmox. I managed to install win10 + vmware workstation inside proxmox with Ryzen 3900X

 

[breaker_]

Well it appears that nested virtualization with AMD isn't possible in a GA release of Windows 10 yet to my knowledge. It requires a build that you need to be a Windows Insider for...

 

[yurtesen]

@mcdull that microsoft article refers to hyper-v support of nested virtualization. One could achieve nested virtualization in windows using other software.

@breaker_ nested virtualization on AMD was possible for long time. Although I am not sure if VMWare supports it. Here are instructions using VirtualBox
https://pve.proxmox.com/wiki/Proxmox_VE_inside_VirtualBox

 

[mcdull]

@yurtesen
This thread is about running vmware under windows, which utilize hyper-v in windows.

 

[yurtesen]

@mcdull my apologies. I did not know vmware supported using hyper-v already. Anyway, I guess I got confused because you wrote

nested vm in AMD and windows is very new indeed

when you apparently meant "hyper-v"...

Just one question, how do you know that OP is using the hyper-v mode in windows?

 

[mcdull]

I did not assume OP must use hyper-v mode but removing hyper-v entrirely is extremely difficult if not impossible so it should always be assuming the hyper-v plays a role here.

 

[yurtesen]

@mcdull my home pc/laptop arrived with windows 10 pro and hyper-v was NOT enabled. Although I tried it at some point, the enabling disabling was as simple as going to control panel and enable the Hyper-V Hypervisor by checking the checkbox and disable it clearing the checkbox.
https://docs.microsoft.com/en-us/tr...ent/virtualization-apps-not-work-with-hyper-v
At least my experience was that it is not difficult to enable/disable it and it comes disabled by default.

But anyway maybe @breaker_ tells us if he is using hyper-v or not, there is no point in trying to guess I guess.