Question about CPU Type

[smorvan]

Hello,

My host is a Ryzen ThreadRipper 7950x and the Graphics Card I am trying to pass is a Quadro T1000 4Gb.

Whenever I use 'host' as the CPU type in a Windows10 machine, the GPU no longer works - I either get a 'Code 43' or a partially functioning GPU (recognized, but not providing any hw acceleration).

OTH, if I use 'qemu64' as the CPU type, the graphics card functions as expected.

I passed what I believe to be the right option in GRUB (follow PCI Passthrough guide + video=vesafb:off,efifb:offas kernel options). I am running Proxmox 7.4-3.

1) Why is this?

2) Can it be fixed?

3) What are the cons of having 'qemu64' as a CPU type?

Thx!

 

[mira]

You could try a custom CPU type or one of the predefined ones that don't have the `svm` flag set.
If you don't have nested VMs (VMs inside VMs) and don't need them, you could also try disabling nesting instead.