1 /****************************************************************************** 2 * features.h 3 * 4 * Feature flags, reported by XENVER_get_features. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * Copyright (c) 2006, Keir Fraser <keir@xensource.com> 25 */ 26 27 #ifndef __XEN_PUBLIC_FEATURES_H__ 28 #define __XEN_PUBLIC_FEATURES_H__ 29 30 /* 31 * `incontents 200 elfnotes_features XEN_ELFNOTE_FEATURES 32 * 33 * The list of all the features the guest supports. They are set by 34 * parsing the XEN_ELFNOTE_FEATURES and XEN_ELFNOTE_SUPPORTED_FEATURES 35 * string. The format is the feature names (as given here without the 36 * "XENFEAT_" prefix) separated by '|' characters. 37 * If a feature is required for the kernel to function then the feature name 38 * must be preceded by a '!' character. 39 * 40 * Note that if XEN_ELFNOTE_SUPPORTED_FEATURES is used, then in the 41 * XENFEAT_dom0 MUST be set if the guest is to be booted as dom0, 42 */ 43 44 /* 45 * If set, the guest does not need to write-protect its pagetables, and can 46 * update them via direct writes. 47 */ 48 #define XENFEAT_writable_page_tables 0 49 50 /* 51 * If set, the guest does not need to write-protect its segment descriptor 52 * tables, and can update them via direct writes. 53 */ 54 #define XENFEAT_writable_descriptor_tables 1 55 56 /* 57 * If set, translation between the guest's 'pseudo-physical' address space 58 * and the host's machine address space are handled by the hypervisor. In this 59 * mode the guest does not need to perform phys-to/from-machine translations 60 * when performing page table operations. 61 */ 62 #define XENFEAT_auto_translated_physmap 2 63 64 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ 65 #define XENFEAT_supervisor_mode_kernel 3 66 67 /* 68 * If set, the guest does not need to allocate x86 PAE page directories 69 * below 4GB. This flag is usually implied by auto_translated_physmap. 70 */ 71 #define XENFEAT_pae_pgdir_above_4gb 4 72 73 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ 74 #define XENFEAT_mmu_pt_update_preserve_ad 5 75 76 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ 77 #define XENFEAT_highmem_assist 6 78 79 /* 80 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel 81 * available pte bits. 82 */ 83 #define XENFEAT_gnttab_map_avail_bits 7 84 85 /* x86: Does this Xen host support the HVM callback vector type? */ 86 #define XENFEAT_hvm_callback_vector 8 87 88 /* x86: pvclock algorithm is safe to use on HVM */ 89 #define XENFEAT_hvm_safe_pvclock 9 90 91 /* x86: pirq can be used by HVM guests */ 92 #define XENFEAT_hvm_pirqs 10 93 94 /* operation as Dom0 is supported */ 95 #define XENFEAT_dom0 11 96 97 /* Xen also maps grant references at pfn = mfn. 98 * This feature flag is deprecated and should not be used. 99 #define XENFEAT_grant_map_identity 12 100 */ 101 102 /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */ 103 #define XENFEAT_memory_op_vnode_supported 13 104 105 /* arm: Hypervisor supports ARM SMC calling convention. */ 106 #define XENFEAT_ARM_SMCCC_supported 14 107 108 /* 109 * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP 110 * must be located in lower 1MB, as required by ACPI Specification for IA-PC 111 * systems. 112 * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains 113 * the "linux" string. 114 */ 115 #define XENFEAT_linux_rsdp_unrestricted 15 116 117 /* 118 * A direct-mapped (or 1:1 mapped) domain is a domain for which its 119 * local pages have gfn == mfn. If a domain is direct-mapped, 120 * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped 121 * is set. 122 * 123 * If neither flag is set (e.g. older Xen releases) the assumptions are: 124 * - not auto_translated domains (x86 only) are always direct-mapped 125 * - on x86, auto_translated domains are not direct-mapped 126 * - on ARM, Dom0 is direct-mapped, DomUs are not 127 */ 128 #define XENFEAT_not_direct_mapped 16 129 #define XENFEAT_direct_mapped 17 130 131 #define XENFEAT_NR_SUBMAPS 1 132 133 #endif /* __XEN_PUBLIC_FEATURES_H__ */ 134 135 /* 136 * Local variables: 137 * mode: C 138 * c-file-style: "BSD" 139 * c-basic-offset: 4 140 * tab-width: 4 141 * indent-tabs-mode: nil 142 * End: 143 */ 144