NAME
vmt —
VMware Tools driver
SYNOPSIS
vmt0 at cpu0
DESCRIPTION
The
vmt driver is a kernel level implementation of VMware
Tools. VMware Tools are intended to provide better support for operating
systems running inside virtual machines.
vmt handles shutdown, reboot, resume requests from the host by
sending events using
sysmon_pswitch(9) of
type PSWITCH_TYPE_POWER, PSWITCH_TYPE_RESET, and PSWITCH_TYPE_SLEEP that can
be handled by
powerd(8).
vmt will log notifications that the guest has been suspended
or resumed by the host.
vmt reports the guest's hostname and first non-loopback IP
address to the host.
Clock synchronization
The
vmt driver synchronizes the virtual machine's clock with
the host clock in the following situations:
- When the virtual machine resumes after having been
suspended.
- Periodically with the interval indicated by the
machdep.vmt0.clock_sync.period
sysctl(8) variable. This
is done so that the virtual machine can keep its clock synchronized when
the host is suspended, because in this case the vmt
driver receives no notification of such an event. Setting this tunable to
zero disables clock synchronization.
SEE ALSO
powerd(8)
HISTORY
The
vmt driver first appeared in
OpenBSD
4.4 and was then ported to
NetBSD 6.0.
AUTHORS
The
vmt driver was written by
David
Gwynne
<
dlg@openbsd.org>.