| 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 | */ |