Hi Stefan, After pulling from upstream this morning, my guest VMs were no longer able to boot. For instance, running something like
bin/qemu-system-x86_64 -machine q35,accel=kvm -m 2048 -monitor stdio \ -device ide-drive,bus=ide.2,drive=CD \ -drive id=CD,if=none,snapshot=on,file=Fedora-Live-Workstation-x86_64-22-3.iso Would just hang with a black screen, or sometimes partially display the GRUB boot menu, and never make it any further than that. After a bisect, I narrowed it down to 5b82b70 ("memory: RCU ram_list.dirty_memory[] for safe RAM hotplug"); reverting that commit got me back to where my VMs were working fine, but the actual content of the changes isn't immediately obvious. Apologies for the noise in case you're already aware of the problem. Otherwise, I'd be happy to test and send you debug output. Please advise. Thanks much, --Gabriel