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__ */