Charlie Jacobsen authored Jun 01, 2014 and Vikram Narayanan committed Oct 25, 2016

Added a few missing macros to arch/x86/include/vmx.h,
and RESERVED masks for easily determining which bits
in a vmx control are reserved (needed in adjust_vmx_controls).

Re-factored setup_vmcs_config and adjust_vmx_controls.
setup_vmcs_config does pretty much the same thing, but it
fails immediately if a control isn't available --
adjust_vmx_controls confirms that the exact desired
controls are available, and sets the reserved bits to
1 or 0 as needed. Cleaner comments and organization.
Re-factored the vmx basic settings to
vmcs_config_basic_settings.

Removed some of the vmx feature check code that was in
the original lcd_vmx_init, as setup_vmcs_config now does
that.

Essentially a straight copy over of:

-- __vmx_enable
-- vmx_enable
-- vmx_disable
-- vmx_free_vmxon_areas
-- __vmxon
-- __vmxoff

The only difference is I shifted tbl and cache
invalidation to vmx_enable (originally in __vmx_enable)
and added some comments.

Straight copy over of
-- vmx_alloc_vmcs
-- vmx_free_vmcs
-- invvpid, invept code, with slight renaming