It’s incorrect. I have 2 AMD cards, I can detach it from linux before booting the guest. After I shut down the guest I have to log out in Gnome to make the card usable again, but no reboot required. It depends on how you set it up. I have a single 34" monitor with 2 inputs, connected to both cards.
I recommend to read about this topic, it would be quicker than waiting for people to answer, your questions were answered multiple times. I recommend the vfio wiki on the r*ddit a lot of good links are collected there: https://old.reddit.com/r/VFIO/wiki/index
archlinux@lemmy.ml seems active to m
Your text says
qemu-desktop
is only “optional” forqemu-base
. You can safely remove qemu-desktop, pacman won’t nag about optional dependencies.For checking dependencies, I like to use
pactree
, it draws nice graphs in the terminal: https://wiki.archlinux.org/title/Pacman#Pactree