windows.sh

My configuration and other files for QEMU to launch Windows VM with GPU passthrough (VFIO)

Hardware:

CPU: Ryzen 3950X
Mobo: Asus X570 Hero WiFi
RAM: 4x16 GB (64GB) @ 3600MHz CL16
GPU (Host): RX 5700 XT
GPU (Guest): GTX 1080 Ti

/etc/modules-load.d/kvmfr.conf:

kvmfr

/etc/modprobe/kvm.conf:

# kvm_amd avic is incompatible with nested (TODO Enable back on 5.19+)
# vhost_net experimental_zcopytx causes host lockup under high bandwidth load

options kvm ignore_msrs=N report_ignored_msrs=Y
options kvm_amd avic=1 nested=0
options vfio_pci ids=10de:1b06,10de:10ef,1912:0015 disable_vga=1
#options vhost_net experimental_zcopytx=1
softdep nvidia pre: vfio_pci

/etc/modprobe/kvmfr.conf:

options kvmfr static_size_mb=128

/etc/udev/rules.d/20-kvmfr.conf:

SUBSYSTEM=="kvmfr", OWNER="root", GROUP="kvm", MODE="0660"

Specials:

• Found many useful flags in other configurations, as well as in qemu official doc
• AVIC, CPU-PM and preallocated RAM are enabled to reduce latency
• KVM state is not hidden, since NVidia allowed using their GPUs in VMs recently
• VirtIO devices are used for anything that can be paravirtualized
• kvmfr module is used for creating IVSHMEM device
• QXL display can be viewed until GPU is initialized
• Spice and JACK audio devices are both working perfectly with no stuttering
• Separate physical USB controller is also passed through; qemu-xhci is buggy when used with multiple same devices (e.g. with Valve HMD controllers)
• Secure boot and TPM2 are enabled