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 <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 | /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ |
46 | #define XENFEAT_highmem_assist 6 |
47 | |
48 | /* |
49 | * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel |
50 | * available pte bits. |
51 | */ |
52 | #define XENFEAT_gnttab_map_avail_bits 7 |
53 | |
54 | /* x86: Does this Xen host support the HVM callback vector type? */ |
55 | #define XENFEAT_hvm_callback_vector 8 |
56 | |
57 | /* x86: pvclock algorithm is safe to use on HVM */ |
58 | #define XENFEAT_hvm_safe_pvclock 9 |
59 | |
60 | /* x86: pirq can be used by HVM guests */ |
61 | #define XENFEAT_hvm_pirqs 10 |
62 | |
63 | /* operation as Dom0 is supported */ |
64 | #define XENFEAT_dom0 11 |
65 | |
66 | /* Xen also maps grant references at pfn = mfn. |
67 | * This feature flag is deprecated and should not be used. |
68 | #define XENFEAT_grant_map_identity 12 |
69 | */ |
70 | |
71 | /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */ |
72 | #define XENFEAT_memory_op_vnode_supported 13 |
73 | |
74 | /* arm: Hypervisor supports ARM SMC calling convention. */ |
75 | #define XENFEAT_ARM_SMCCC_supported 14 |
76 | |
77 | /* |
78 | * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP |
79 | * must be located in lower 1MB, as required by ACPI Specification for IA-PC |
80 | * systems. |
81 | * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains |
82 | * the "linux" string. |
83 | */ |
84 | #define XENFEAT_linux_rsdp_unrestricted 15 |
85 | |
86 | /* |
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 direct-mapped, |
89 | * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped |
90 | * is set. |
91 | * |
92 | * If neither flag is set (e.g. older Xen releases) the assumptions are: |
93 | * - not auto_translated domains (x86 only) are always direct-mapped |
94 | * - on x86, auto_translated domains are not direct-mapped |
95 | * - on ARM, Dom0 is direct-mapped, DomUs are not |
96 | */ |
97 | #define XENFEAT_not_direct_mapped 16 |
98 | #define XENFEAT_direct_mapped 17 |
99 | |
100 | #define XENFEAT_NR_SUBMAPS 1 |
101 | |
102 | #endif /* __XEN_PUBLIC_FEATURES_H__ */ |
103 | |