qemu/qapi/uefi.json

# -*- Mode: Python -*-
# vim: filetype=python
#

##
# = UEFI Variable Store
#
# The qemu efi variable store implementation (hw/uefi/) uses this to
# store non-volatile variables in json format on disk.
#
# This is an existing format already supported by (at least) two other
# projects, specifically https://gitlab.com/kraxel/virt-firmware and
# https://github.com/awslabs/python-uefivars.
##

##
# @UefiVariable:
#
# UEFI Variable.  Check the UEFI specifification for more detailed
# information on the fields.
#
# @guid: variable namespace GUID
#
# @name: variable name, in UTF-8 encoding.
#
# @attr: variable attributes.
#
# @data: variable value, encoded as hex string.
#
# @time: variable modification time.  EFI_TIME struct, encoded as hex
#     string.  Used only for authenticated variables, where the
#     EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute bit
#     is set.
#
# @digest: variable certificate digest.  Used to verify the signature
#     of updates for authenticated variables.  UEFI has two kinds of
#     authenticated variables.  The secure boot variables ('PK',
#     'KEK', 'db' and 'dbx') have hard coded signature checking rules.
#     For other authenticated variables the firmware stores a digest
#     of the signing certificate at variable creation time, and any
#     updates must be signed with the same certificate.
#
# Since: 10.0
##
{ 'struct' : 'UefiVariable',
  'data' : { 'guid'  : 'str',
             'name'  : 'str',
             'attr'  : 'int',
             'data'  : 'str',
             '*time' : 'str',
             '*digest' : 'str'}}

##
# @UefiVarStore:
#
# @version: currently always 2
#
# @variables: list of UEFI variables
#
# Since: 10.0
##
{ 'struct' : 'UefiVarStore',
  'data' : { 'version'   : 'int',
             'variables' : [ 'UefiVariable' ] }}