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VMT(4)                    Device Drivers Manual (x86)                   VMT(4)

NAME
     vmt - VMware Tools driver

SYNOPSIS
     vmt0 at cpu0
     vmt0 at fdt?

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>.

NetBSD 10.99                    October 6, 2013                   NetBSD 10.99