https://kernel.googlesource.com/pub/scm/linux/kernel/git/dhowells/linux-fscache/+/437cf4c7b7feeca29f74e1e6f8d458ea2623d5e2/virt/kvm/ioapic.h
virt/kvm/ioapic.h - pub/scm/linux/kernel/git/dhowells/linux-fscache - Git at Google
linux kernelvirtkvmioapicpub