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 FILE_LICENCE ( MIT ); 31 32 /* 33 * `incontents 200 elfnotes_features XEN_ELFNOTE_FEATURES 34 * 35 * The list of all the features the guest supports. They are set by 36 * parsing the XEN_ELFNOTE_FEATURES and XEN_ELFNOTE_SUPPORTED_FEATURES 37 * string. The format is the feature names (as given here without the 38 * "XENFEAT_" prefix) separated by '|' characters. 39 * If a feature is required for the kernel to function then the feature name 40 * must be preceded by a '!' character. 41 * 42 * Note that if XEN_ELFNOTE_SUPPORTED_FEATURES is used, then in the 43 * XENFEAT_dom0 MUST be set if the guest is to be booted as dom0, 44 */ 45 46 /* 47 * If set, the guest does not need to write-protect its pagetables, and can 48 * update them via direct writes. 49 */ 50 #define XENFEAT_writable_page_tables 0 51 52 /* 53 * If set, the guest does not need to write-protect its segment descriptor 54 * tables, and can update them via direct writes. 55 */ 56 #define XENFEAT_writable_descriptor_tables 1 57 58 /* 59 * If set, translation between the guest's 'pseudo-physical' address space 60 * and the host's machine address space are handled by the hypervisor. In this 61 * mode the guest does not need to perform phys-to/from-machine translations 62 * when performing page table operations. 63 */ 64 #define XENFEAT_auto_translated_physmap 2 65 66 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ 67 #define XENFEAT_supervisor_mode_kernel 3 68 69 /* 70 * If set, the guest does not need to allocate x86 PAE page directories 71 * below 4GB. This flag is usually implied by auto_translated_physmap. 72 */ 73 #define XENFEAT_pae_pgdir_above_4gb 4 74 75 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ 76 #define XENFEAT_mmu_pt_update_preserve_ad 5 77 78 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ 79 #define XENFEAT_highmem_assist 6 80 81 /* 82 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel 83 * available pte bits. 84 */ 85 #define XENFEAT_gnttab_map_avail_bits 7 86 87 /* x86: Does this Xen host support the HVM callback vector type? */ 88 #define XENFEAT_hvm_callback_vector 8 89 90 /* x86: pvclock algorithm is safe to use on HVM */ 91 #define XENFEAT_hvm_safe_pvclock 9 92 93 /* x86: pirq can be used by HVM guests */ 94 #define XENFEAT_hvm_pirqs 10 95 96 /* operation as Dom0 is supported */ 97 #define XENFEAT_dom0 11 98 99 #define XENFEAT_NR_SUBMAPS 1 100 101 #endif /* __XEN_PUBLIC_FEATURES_H__ */ 102 103 /* 104 * Local variables: 105 * mode: C 106 * c-file-style: "BSD" 107 * c-basic-offset: 4 108 * tab-width: 4 109 * indent-tabs-mode: nil 110 * End: 111 */ 112