Pull up following revision(s) (requested by maya in ticket #325):
sys/arch/x86/x86/vmt.c: revision 1.18
Check that the host supports GET_SPEED as well as GET_VERSION
before deciding vmt_probe has succeeded.
qemu supports GET_VERSION but not the RPC protocol so the probe succeeds
but the attach fails, resulting in "vmt0: failed to open backdoor RPC
channel (TCLO protocol)".  All known versions of vmware support GET_SPEED
and no known qemu versions do, so this prevents it from attempting to
attach (and failing) on qemu while still working on vmware.
stop checking vmt_type to avoid having to adapt this code.
- Taken from openbsd

(snj)