VM extremely slow with AMD Ryzen 1st series

ok, I had AMD SVN (virtualization option) disabled for some reason in the UEFI…
I think the UEFI upgrade screwed it.

But these things were also responsable for it, mainly the Hypervisor choice I guess.

Overview

  • Hypervisor → KVM (for some reason I had QEMU TGC)
    You need to edit the xml in this way:
    domain type=“kvm”

  • Chipset Q35 (no issues here, but double check)

  • Firmware (make sure it’s BIOS instead of UEFI)
    In Windows 11, only UEFI should work, this is the most complete guide I found but I didn’t test it yet.
    Windows 11 on Fedora: Windows 11 on KVM – How to Install Step by Step? – GetLabsDone

CPUs → Configuration

Trigger the option “Copy host CPU configuration”

Display Spice → Address: Localhost is the default one

(for some reason I had Hypervisor default)


Bottom line, leave the default config as much as possible and make sure that the virtualization option is enabled in the UEFI, which I though it was…

The start may be a bit slower than expected with the dracut script, but after that, all goes fast.

Thanks everyone!!!