Damned slow QEMU virtualization

Software & Operating Systems Linux
1

Hi folks, I’m running a Windows 11 VM and the graphics is stuttery as hell - about 5 FPS to give you an impression. I’ve ran virtual machines before on less competent hardware and they went much smoother. Anyone knows what the problem could be? Here is the command I’m using:

qemu-system-x86_64 --enable-kvm -drive driver=raw,file=${RAW60G},if=virtio -m 6144
-net nic,model=virtio -net user -cdrom ${WINIMG}
-drive file=${VIRTIMG},index=3,media=cdrom
-rtc base=localtime,clock=host -smp cores=6,threads=2
-usb -device usb-tablet
-net user,smb=$HOME

I had to molest the registry in order to get win even to install (BypassTPMCheck=1, BypassSecureBootCheck=1).

I use fedora btw.

2

Have you tried setting the cpu and GPU explicitly?

-cpu host \
-vga qxl \
-device qxl-vga \
-smp 4,socket=1,cores=4 \
-machine type=q35 #i440fx is buggy and old
3

Virtualisation is enabled in bios?

If I recall QEMU will do vm in software if hardware support is not present or disabled.

4

Yes, this is true. My first attempt and KVM/Virt Manager resulted in a ridiculously slow VM. The system I was using defaulted virtualization to be off in the BIOS and the guide I was following didn’t mention checking this.