I agree that QEMU shouldn't use much CPU when paused, regardless of VM settings. For reference, I narrowed down a (more) minimal test case:
Using the Windows 10 May 2020 English 64-bit ISO from https://www.microsoft.com/en-us/software-download/windows10ISO qemu-system-x86_64 \ -no-user-config \ -machine pc-q35-5.0,accel=kvm \ -m 1024 \ -blockdev driver=file,node-name=win10iso,filename=Win10_2004_English_x64.iso \ -device ide-cd,drive=win10iso \ -no-hpet \ -rtc driftfix=slew then pause the VM after the "Windows Setup" window appears, qemu-system- x86_64 uses ~40% CPU. Without -rtc driftfix=slew, ~10%. Without -no- hpet, ~1%. I added it to the ML discussion this morning to see if there was interest in fixing the issue, but so far no takers: https://lore.kernel.org/kvm/20200626151432.GA231100@kevinolos/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1851062 Title: Qemu using CPU even when the VM is paused To manage notifications about this bug go to: https://bugs.launchpad.net/virt-manager/+bug/1851062/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
