[Differential] D14473: userboot: add callbacks to set unrestricted guest mode

[fabian.freyer_physik.tu-berlin.de (Fabian Freyer)]

fabian.freyer_physik.tu-berlin.de created this revision.
fabian.freyer_physik.tu-berlin.de added a project: bhyve.
Herald added subscribers: Contributor Reviews (base), imp.

REVISION SUMMARY
  The current userboot interface sets this capability using `vm_setup_freebsd_registers_i386` in lib/libvmmapi/libvmmapi_freebsd.c. This patch adds support for loaders to explicitly query and/or set this capability without having to go through the `exec` callback, but set up registers themselves.
  
  This change is backwards-compatible as all new callbacks are added to the end of the callback structure.

TEST PLAN
  test with a library implementing `loader_main` and calling these callbacks. Check whether capability is set.

REPOSITORY
  rS FreeBSD src repository

REVISION DETAIL
  https://reviews.freebsd.org/D14473

AFFECTED FILES
  stand/userboot/userboot.h
  usr.sbin/bhyveload/bhyveload.c

EMAIL PREFERENCES
  https://reviews.freebsd.org/settings/panel/emailpreferences/

To: fabian.freyer_physik.tu-berlin.de
Cc: imp, freebsd-virtualization-list, #contributor_reviews_base
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