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 /* 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 #define XENFEAT_NR_SUBMAPS 1
87
88 #endif /* __XEN_PUBLIC_FEATURES_H__ */