1 /* SPDX-License-Identifier: MIT */ 1 /* SPDX-License-Identifier: MIT */
2 /********************************************* 2 /******************************************************************************
3 * features.h 3 * features.h
4 * 4 *
5 * Feature flags, reported by XENVER_get_featu 5 * Feature flags, reported by XENVER_get_features.
6 * 6 *
7 * Copyright (c) 2006, Keir Fraser <keir@xenso 7 * Copyright (c) 2006, Keir Fraser <keir@xensource.com>
8 */ 8 */
9 9
10 #ifndef __XEN_PUBLIC_FEATURES_H__ 10 #ifndef __XEN_PUBLIC_FEATURES_H__
11 #define __XEN_PUBLIC_FEATURES_H__ 11 #define __XEN_PUBLIC_FEATURES_H__
12 12
13 /* 13 /*
14 * If set, the guest does not need to write-pr 14 * If set, the guest does not need to write-protect its pagetables, and can
15 * update them via direct writes. 15 * update them via direct writes.
16 */ 16 */
17 #define XENFEAT_writable_page_tables 0 17 #define XENFEAT_writable_page_tables 0
18 18
19 /* 19 /*
20 * If set, the guest does not need to write-pr 20 * If set, the guest does not need to write-protect its segment descriptor
21 * tables, and can update them via direct writ 21 * tables, and can update them via direct writes.
22 */ 22 */
23 #define XENFEAT_writable_descriptor_tables 1 23 #define XENFEAT_writable_descriptor_tables 1
24 24
25 /* 25 /*
26 * If set, translation between the guest's 'ps 26 * If set, translation between the guest's 'pseudo-physical' address space
27 * and the host's machine address space are ha 27 * and the host's machine address space are handled by the hypervisor. In this
28 * mode the guest does not need to perform phy 28 * mode the guest does not need to perform phys-to/from-machine translations
29 * when performing page table operations. 29 * when performing page table operations.
30 */ 30 */
31 #define XENFEAT_auto_translated_physmap 2 31 #define XENFEAT_auto_translated_physmap 2
32 32
33 /* If set, the guest is running in supervisor 33 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
34 #define XENFEAT_supervisor_mode_kernel 3 34 #define XENFEAT_supervisor_mode_kernel 3
35 35
36 /* 36 /*
37 * If set, the guest does not need to allocate 37 * If set, the guest does not need to allocate x86 PAE page directories
38 * below 4GB. This flag is usually implied by 38 * below 4GB. This flag is usually implied by auto_translated_physmap.
39 */ 39 */
40 #define XENFEAT_pae_pgdir_above_4gb 4 40 #define XENFEAT_pae_pgdir_above_4gb 4
41 41
42 /* x86: Does this Xen host support the MMU_PT_ 42 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
43 #define XENFEAT_mmu_pt_update_preserve_ad 5 43 #define XENFEAT_mmu_pt_update_preserve_ad 5
44 44
45 /* x86: Does this Xen host support the MMU_{CL 45 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */
46 #define XENFEAT_highmem_assist 6 46 #define XENFEAT_highmem_assist 6
47 47
48 /* 48 /*
49 * If set, GNTTABOP_map_grant_ref honors flags 49 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
50 * available pte bits. 50 * available pte bits.
51 */ 51 */
52 #define XENFEAT_gnttab_map_avail_bits 7 52 #define XENFEAT_gnttab_map_avail_bits 7
53 53
54 /* x86: Does this Xen host support the HVM cal 54 /* x86: Does this Xen host support the HVM callback vector type? */
55 #define XENFEAT_hvm_callback_vector 8 55 #define XENFEAT_hvm_callback_vector 8
56 56
57 /* x86: pvclock algorithm is safe to use on HV 57 /* x86: pvclock algorithm is safe to use on HVM */
58 #define XENFEAT_hvm_safe_pvclock 9 58 #define XENFEAT_hvm_safe_pvclock 9
59 59
60 /* x86: pirq can be used by HVM guests */ 60 /* x86: pirq can be used by HVM guests */
61 #define XENFEAT_hvm_pirqs 10 61 #define XENFEAT_hvm_pirqs 10
62 62
63 /* operation as Dom0 is supported */ 63 /* operation as Dom0 is supported */
64 #define XENFEAT_dom0 11 64 #define XENFEAT_dom0 11
65 65
66 /* Xen also maps grant references at pfn = mfn 66 /* Xen also maps grant references at pfn = mfn.
67 * This feature flag is deprecated and should 67 * This feature flag is deprecated and should not be used.
68 #define XENFEAT_grant_map_identity 12 68 #define XENFEAT_grant_map_identity 12
69 */ 69 */
70 70
71 /* Guest can use XENMEMF_vnode to specify virt 71 /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */
72 #define XENFEAT_memory_op_vnode_supported 13 72 #define XENFEAT_memory_op_vnode_supported 13
73 73
74 /* arm: Hypervisor supports ARM SMC calling co 74 /* arm: Hypervisor supports ARM SMC calling convention. */
75 #define XENFEAT_ARM_SMCCC_supported 14 75 #define XENFEAT_ARM_SMCCC_supported 14
76 76
77 /* 77 /*
78 * x86/PVH: If set, ACPI RSDP can be placed at 78 * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP
79 * must be located in lower 1MB, as required b 79 * must be located in lower 1MB, as required by ACPI Specification for IA-PC
80 * systems. 80 * systems.
81 * This feature flag is only consulted if XEN_ 81 * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains
82 * the "linux" string. 82 * the "linux" string.
83 */ 83 */
84 #define XENFEAT_linux_rsdp_unrestricted 15 84 #define XENFEAT_linux_rsdp_unrestricted 15
85 85
86 /* 86 /*
87 * A direct-mapped (or 1:1 mapped) domain is a 87 * A direct-mapped (or 1:1 mapped) domain is a domain for which its
88 * local pages have gfn == mfn. If a domain is 88 * local pages have gfn == mfn. If a domain is direct-mapped,
89 * XENFEAT_direct_mapped is set; otherwise XEN 89 * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped
90 * is set. 90 * is set.
91 * 91 *
92 * If neither flag is set (e.g. older Xen rele 92 * If neither flag is set (e.g. older Xen releases) the assumptions are:
93 * - not auto_translated domains (x86 only) ar 93 * - not auto_translated domains (x86 only) are always direct-mapped
94 * - on x86, auto_translated domains are not d 94 * - on x86, auto_translated domains are not direct-mapped
95 * - on ARM, Dom0 is direct-mapped, DomUs are 95 * - on ARM, Dom0 is direct-mapped, DomUs are not
96 */ 96 */
97 #define XENFEAT_not_direct_mapped 16 97 #define XENFEAT_not_direct_mapped 16
98 #define XENFEAT_direct_mapped 17 98 #define XENFEAT_direct_mapped 17
99 99
100 #define XENFEAT_NR_SUBMAPS 1 100 #define XENFEAT_NR_SUBMAPS 1
101 101
102 #endif /* __XEN_PUBLIC_FEATURES_H__ */ 102 #endif /* __XEN_PUBLIC_FEATURES_H__ */
103 103
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