this post was submitted on 11 Jun 2023
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What hypervisor are you using?
I use proxmox and run a couple windows VMs for Remote Desktop. I’ve passed through nvidia gpus and even at point had a nvidia grid setup running splitting up a P40 across multiple VMs.
The nvidia gpu’s require several config options to ‘spoof’ a real desktop and prevent the code 43 error but windows still identifies them as virtual machines. I’ve never found a way for trick windows itself into thinking it’s stand alone.
Its been a while since I've had any gpu's attached to a windows VM but I think my time pre dates the change. I realized they were not actually doing anything for my given workloads so I sold most of them. The P40 is setup in a VM for tensorflow now and one of these days Ill get the time to go back to that.
I have recently been playing with VMs in Unraid and in the video tutorials I've seen they talk about about grouping together (by editing xml file[1]) the video with audio that comes the GPU to avoid that error. Also about passing a modified BIOS. Are those the workarounds been talked about here?
[1] multifunction='on'
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for hypervisor i'm using libvirt+qemu. by doing this, a few lines in the .xml for the vm is all that is needed for me to enable some hyper-v feature flags to spoof to windows that it's not a vm. check to see if proxmox has some hyper-v features you can enable for this purpose.