Currently Hypervisor Emulation Assistance interrupt is unhandled. Executing an undefined instruction in userland triggers kernel panic. Handle this the same way as Facility Unavailable Interrupt - send SIGILL signal to userspace. Submitted by: Michal Stanek <mst@semihalf.com> Obtained from: Semihalf Reviewed by: nwhitehorn, pdk@semihalf.com, wma Sponsored by: IBM, QCM Technologies Differential revision: https://reviews.freebsd.org/D14437