features.h 3.3 KB

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  1. /* SPDX-License-Identifier: MIT */
  2. /******************************************************************************
  3. * features.h
  4. *
  5. * Feature flags, reported by XENVER_get_features.
  6. *
  7. * Copyright (c) 2006, Keir Fraser <[email protected]>
  8. */
  9. #ifndef __XEN_PUBLIC_FEATURES_H__
  10. #define __XEN_PUBLIC_FEATURES_H__
  11. /*
  12. * If set, the guest does not need to write-protect its pagetables, and can
  13. * update them via direct writes.
  14. */
  15. #define XENFEAT_writable_page_tables 0
  16. /*
  17. * If set, the guest does not need to write-protect its segment descriptor
  18. * tables, and can update them via direct writes.
  19. */
  20. #define XENFEAT_writable_descriptor_tables 1
  21. /*
  22. * If set, translation between the guest's 'pseudo-physical' address space
  23. * and the host's machine address space are handled by the hypervisor. In this
  24. * mode the guest does not need to perform phys-to/from-machine translations
  25. * when performing page table operations.
  26. */
  27. #define XENFEAT_auto_translated_physmap 2
  28. /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
  29. #define XENFEAT_supervisor_mode_kernel 3
  30. /*
  31. * If set, the guest does not need to allocate x86 PAE page directories
  32. * below 4GB. This flag is usually implied by auto_translated_physmap.
  33. */
  34. #define XENFEAT_pae_pgdir_above_4gb 4
  35. /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
  36. #define XENFEAT_mmu_pt_update_preserve_ad 5
  37. /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */
  38. #define XENFEAT_highmem_assist 6
  39. /*
  40. * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
  41. * available pte bits.
  42. */
  43. #define XENFEAT_gnttab_map_avail_bits 7
  44. /* x86: Does this Xen host support the HVM callback vector type? */
  45. #define XENFEAT_hvm_callback_vector 8
  46. /* x86: pvclock algorithm is safe to use on HVM */
  47. #define XENFEAT_hvm_safe_pvclock 9
  48. /* x86: pirq can be used by HVM guests */
  49. #define XENFEAT_hvm_pirqs 10
  50. /* operation as Dom0 is supported */
  51. #define XENFEAT_dom0 11
  52. /* Xen also maps grant references at pfn = mfn.
  53. * This feature flag is deprecated and should not be used.
  54. #define XENFEAT_grant_map_identity 12
  55. */
  56. /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */
  57. #define XENFEAT_memory_op_vnode_supported 13
  58. /* arm: Hypervisor supports ARM SMC calling convention. */
  59. #define XENFEAT_ARM_SMCCC_supported 14
  60. /*
  61. * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP
  62. * must be located in lower 1MB, as required by ACPI Specification for IA-PC
  63. * systems.
  64. * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains
  65. * the "linux" string.
  66. */
  67. #define XENFEAT_linux_rsdp_unrestricted 15
  68. /*
  69. * A direct-mapped (or 1:1 mapped) domain is a domain for which its
  70. * local pages have gfn == mfn. If a domain is direct-mapped,
  71. * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped
  72. * is set.
  73. *
  74. * If neither flag is set (e.g. older Xen releases) the assumptions are:
  75. * - not auto_translated domains (x86 only) are always direct-mapped
  76. * - on x86, auto_translated domains are not direct-mapped
  77. * - on ARM, Dom0 is direct-mapped, DomUs are not
  78. */
  79. #define XENFEAT_not_direct_mapped 16
  80. #define XENFEAT_direct_mapped 17
  81. #define XENFEAT_NR_SUBMAPS 1
  82. #endif /* __XEN_PUBLIC_FEATURES_H__ */