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features.h

features.h 2.0 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. /******************************************************************************
    3. 

  3.  * features.h
    4. 

  4.  *
    5. 

  5.  * Feature flags, reported by XENVER_get_features.
    6. 

  6.  *
    7. 

  7.  * Copyright (c) 2006, Keir Fraser <keir@xensource.com>
    8. 

  8.  */
    9. 

  9. 

  10. #ifndef __XEN_PUBLIC_FEATURES_H__
    11. 

  11. #define __XEN_PUBLIC_FEATURES_H__
    12. 

  12. 

  13. /*
    14. 

  14.  * If set, the guest does not need to write-protect its pagetables, and can
    15. 

  15.  * update them via direct writes.
    16. 

  16.  */
    17. 

  17. #define XENFEAT_writable_page_tables       0
    18. 

  18. 

  19. /*
    20. 

  20.  * If set, the guest does not need to write-protect its segment descriptor
    21. 

  21.  * tables, and can update them via direct writes.
    22. 

  22.  */
    23. 

  23. #define XENFEAT_writable_descriptor_tables 1
    24. 

  24. 

  25. /*
    26. 

  26.  * If set, translation between the guest's 'pseudo-physical' address space
    27. 

  27.  * and the host's machine address space are handled by the hypervisor. In this
    28. 

  28.  * mode the guest does not need to perform phys-to/from-machine translations
    29. 

  29.  * when performing page table operations.
    30. 

  30.  */
    31. 

  31. #define XENFEAT_auto_translated_physmap    2
    32. 

  32. 

  33. /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
    34. 

  34. #define XENFEAT_supervisor_mode_kernel     3
    35. 

  35. 

  36. /*
    37. 

  37.  * If set, the guest does not need to allocate x86 PAE page directories
    38. 

  38.  * below 4GB. This flag is usually implied by auto_translated_physmap.
    39. 

  39.  */
    40. 

  40. #define XENFEAT_pae_pgdir_above_4gb        4
    41. 

  41. 

  42. /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
    43. 

  43. #define XENFEAT_mmu_pt_update_preserve_ad  5
    44. 

  44. 

  45. /*
    46. 

  46.  * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
    47. 

  47.  * available pte bits.
    48. 

  48.  */
    49. 

  49. #define XENFEAT_gnttab_map_avail_bits      7
    50. 

  50. 

  51. /* x86: Does this Xen host support the HVM callback vector type? */
    52. 

  52. #define XENFEAT_hvm_callback_vector        8
    53. 

  53. 

  54. /* x86: pvclock algorithm is safe to use on HVM */
    55. 

  55. #define XENFEAT_hvm_safe_pvclock           9
    56. 

  56. 

  57. /* x86: pirq can be used by HVM guests */
    58. 

  58. #define XENFEAT_hvm_pirqs           10
    59. 

  59. 

  60. /* operation as Dom0 is supported */
    61. 

  61. #define XENFEAT_dom0                      11
    62. 

  62. 

  63. #define XENFEAT_NR_SUBMAPS 1
    64. 

  64. 

  65. #endif /* __XEN_PUBLIC_FEATURES_H__ */
    66.