Error “Unknown PCI header type ‘127’ “
Attention! The ASUS Prime x370/x470/x570 pro BIOS versions for AMD RYZEN 3000-series support (version 4602 – version 5220), will break a PCI passthrough setup. Error “Unknown PCI header type ‘127’“.
BIOS versions up to (and including) 4406, 2019/03/11 are working.
BIOS versions from (and including) 5406, 2019/11/25 are working.
Attention! A kernel version of 4.15 or higher is recommended for an AMD Ryzen passthrough setup. Kernel versions before 4.15 have a bug in NPT support, which results in bad performance.
Attention! Kernel version 5.1 and 5.2 (including all subversions) should not be used for a passthrough setup. Using these Kernel version results in massive program/game instability and crashes.
Attention! Windows releases >=1803 require the Host to have
kvm ignore_msrs=1enabled, otherwise BSOD occur.
Windows 10 1903
Attention! Do not use 6ch/9ch audio devices in the virtual machine. It creates awful stuttering and performance loss. Use ac97 audio devices instead.
Error code 43 for passed Nvidia GPUs
The Nvidia driver throws Error Code 43, if it recognizes the GPU is being passed through to a virtual machine. I wrote an separate article on that matter.
After some sleepless nights I wrote an separate article on that matter.
KVM / QEMU
QEMU 4.0 with Q35
Attention! Starting with QEMU version 4.0, virtual machines with q35 chip will require
<features>tag in the libvirt configuration (respectively