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 * `incontents 200 elfnotes_features XEN_ELFNOTE_FEATURES 15 * 16 * The list of all the features the guest supports. They are set by 17 * parsing the XEN_ELFNOTE_FEATURES and XEN_ELFNOTE_SUPPORTED_FEATURES 18 * string. The format is the feature names (as given here without the 19 * "XENFEAT_" prefix) separated by '|' characters. 20 * If a feature is required for the kernel to function then the feature name 21 * must be preceded by a '!' character. 22 * 23 * Note that if XEN_ELFNOTE_SUPPORTED_FEATURES is used, then in the 24 * XENFEAT_dom0 MUST be set if the guest is to be booted as dom0, 25 */ 26 27 /* 28 * If set, the guest does not need to write-protect its pagetables, and can 29 * update them via direct writes. 30 */ 31 #define XENFEAT_writable_page_tables 0 32 33 /* 34 * If set, the guest does not need to write-protect its segment descriptor 35 * tables, and can update them via direct writes. 36 */ 37 #define XENFEAT_writable_descriptor_tables 1 38 39 /* 40 * If set, translation between the guest's 'pseudo-physical' address space 41 * and the host's machine address space are handled by the hypervisor. In this 42 * mode the guest does not need to perform phys-to/from-machine translations 43 * when performing page table operations. 44 */ 45 #define XENFEAT_auto_translated_physmap 2 46 47 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ 48 #define XENFEAT_supervisor_mode_kernel 3 49 50 /* 51 * If set, the guest does not need to allocate x86 PAE page directories 52 * below 4GB. This flag is usually implied by auto_translated_physmap. 53 */ 54 #define XENFEAT_pae_pgdir_above_4gb 4 55 56 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ 57 #define XENFEAT_mmu_pt_update_preserve_ad 5 58 59 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ 60 #define XENFEAT_highmem_assist 6 61 62 /* 63 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel 64 * available pte bits. 65 */ 66 #define XENFEAT_gnttab_map_avail_bits 7 67 68 /* x86: Does this Xen host support the HVM callback vector type? */ 69 #define XENFEAT_hvm_callback_vector 8 70 71 /* x86: pvclock algorithm is safe to use on HVM */ 72 #define XENFEAT_hvm_safe_pvclock 9 73 74 /* x86: pirq can be used by HVM guests */ 75 #define XENFEAT_hvm_pirqs 10 76 77 /* operation as Dom0 is supported */ 78 #define XENFEAT_dom0 11 79 80 /* Xen also maps grant references at pfn = mfn. 81 * This feature flag is deprecated and should not be used. 82 #define XENFEAT_grant_map_identity 12 83 */ 84 85 /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */ 86 #define XENFEAT_memory_op_vnode_supported 13 87 88 /* arm: Hypervisor supports ARM SMC calling convention. */ 89 #define XENFEAT_ARM_SMCCC_supported 14 90 91 /* 92 * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP 93 * must be located in lower 1MB, as required by ACPI Specification for IA-PC 94 * systems. 95 * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains 96 * the "linux" string. 97 */ 98 #define XENFEAT_linux_rsdp_unrestricted 15 99 100 /* 101 * A direct-mapped (or 1:1 mapped) domain is a domain for which its 102 * local pages have gfn == mfn. If a domain is direct-mapped, 103 * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped 104 * is set. 105 * 106 * If neither flag is set (e.g. older Xen releases) the assumptions are: 107 * - not auto_translated domains (x86 only) are always direct-mapped 108 * - on x86, auto_translated domains are not direct-mapped 109 * - on ARM, Dom0 is direct-mapped, DomUs are not 110 */ 111 #define XENFEAT_not_direct_mapped 16 112 #define XENFEAT_direct_mapped 17 113 114 #define XENFEAT_NR_SUBMAPS 1 115 116 #endif /* __XEN_PUBLIC_FEATURES_H__ */ 117 118 /* 119 * Local variables: 120 * mode: C 121 * c-file-style: "BSD" 122 * c-basic-offset: 4 123 * tab-width: 4 124 * indent-tabs-mode: nil 125 * End: 126 */ 127