MFC 264277:
Handle single-byte reads from the bvmcons port (0x220) by returning
0xff. Some guests may attempt to read from this port to identify
psuedo-PNP ISA devices. (The ie(4) driver in FreeBSD/i386 is one
example.)

MFC 261607:
Mark the I/O ports used by the bhyve console and debug devices as system
resources.

MFC 264277:
Handle single-byte reads from the bvmcons port (0x220) by returning
0xff. Some guests may attempt to read from this port to identify
psuedo-PNP ISA devices. (The ie(4) driver in FreeBSD/i386 is one
example.)

MFC 261607:
Mark the I/O ports used by the bhyve console and debug devices as system
resources.