LXR linux/include/xen/interface/features.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/******************************************************************************
   3 * features.h
   4 *
   5 * Feature flags, reported by XENVER_get_features.
   6 *
   7 * Copyright (c) 2006, Keir Fraser <keir@xensource.com>
   8 */
   9
  10#ifndef __XEN_PUBLIC_FEATURES_H__
  11#define __XEN_PUBLIC_FEATURES_H__
  12
  13/*
  14 * If set, the guest does not need to write-protect its pagetables, and can
  15 * update them via direct writes.
  16 */
  17#define XENFEAT_writable_page_tables       0
  18
  19/*
  20 * If set, the guest does not need to write-protect its segment descriptor
  21 * tables, and can update them via direct writes.
  22 */
  23#define XENFEAT_writable_descriptor_tables 1
  24
  25/*
  26 * If set, translation between the guest's 'pseudo-physical' address space
  27 * and the host's machine address space are handled by the hypervisor. In this
  28 * mode the guest does not need to perform phys-to/from-machine translations
  29 * when performing page table operations.
  30 */
  31#define XENFEAT_auto_translated_physmap    2
  32
  33/* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
  34#define XENFEAT_supervisor_mode_kernel     3
  35
  36/*
  37 * If set, the guest does not need to allocate x86 PAE page directories
  38 * below 4GB. This flag is usually implied by auto_translated_physmap.
  39 */
  40#define XENFEAT_pae_pgdir_above_4gb        4
  41
  42/* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
  43#define XENFEAT_mmu_pt_update_preserve_ad  5
  44
  45/*
  46 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
  47 * available pte bits.
  48 */
  49#define XENFEAT_gnttab_map_avail_bits      7
  50
  51/* x86: Does this Xen host support the HVM callback vector type? */
  52#define XENFEAT_hvm_callback_vector        8
  53
  54/* x86: pvclock algorithm is safe to use on HVM */
  55#define XENFEAT_hvm_safe_pvclock           9
  56
  57/* x86: pirq can be used by HVM guests */
  58#define XENFEAT_hvm_pirqs           10
  59
  60/* operation as Dom0 is supported */
  61#define XENFEAT_dom0                      11
  62
  63#define XENFEAT_NR_SUBMAPS 1
  64
  65#endif /* __XEN_PUBLIC_FEATURES_H__ */
  66