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VMM(2)			 DragonFly System Calls Manual			VMM(2)


NAME

     vmm_guest_ctl, vmm_guest_sync_addr -- enter VMM mode / sync VMM threads


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <sys/vmm.h>

     int
     vmm_guest_ctl(int op, struct vmm_guest_options *options);

     int
     vmm_guest_sync_addr(long *dstaddr, long *srcaddr);


DESCRIPTION

     In order to run a virtual machine on top of the host operating system,
     two sets of page tables are needed (one each for the host and guest).
     Older CPUs supports only one level of page tables and the second level
     had to be emulated in software.  Modern CPUs have support for a second
     level of page table translations, such as Intel's EPT or AMD's RVI.  The
     vmm_*() functions bring the guest virtual machine into a state in which
     the hardware is able to walk two levels of page tables.

     The only op currently supported by vmm_guest_ctl() is VMM_GUEST_RUN,
     which bootstraps the calling process as a VMM process running with
     extended/nested page table support (two layers of page tables).  The
     vmm_guest_options struct is defined in <sys/vmm.h>.

     The vmm_guest_sync_addr() function copies the content of srcaddr to
     dstaddr, synchronizing with all CPUs which are in VMM mode (i.e., all
     CPUs will see srcaddr's value at dstaddr).


HISTORY

     The vmm_guest_ctl() and vmm_guest_sync_addr() system calls were added in
     DragonFly 3.5.


AUTHORS

     Mihai Carabas

DragonFly 5.5		       September 1, 2015		 DragonFly 5.5

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