Hi, Recently I was trying windows 10 on top of Qemu-KVM and I saw 4% of CPU is being used all the time even when the windows VM is idle. I tested it for nested VM (Linux(L0)->Linux(L1)->windows(L2)) and I saw CPU usage increased upto 45%. I traced my host and I saw there is an infinite interrupt loop which injected by qemu main process to my windows VM. I also traced the windows machine and I saw System process is handling that interrupt. The main qemu process injects IRQ 209 periodically. I wonder if it is a bug!!!!!
Cheers, Hani
