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 * If set, the guest does not need to write-protect its pagetables, and can 32 * update them via direct writes. 33 */ 34 #define XENFEAT_writable_page_tables 0 35 36 /* 37 * If set, the guest does not need to write-protect its segment descriptor 38 * tables, and can update them via direct writes. 39 */ 40 #define XENFEAT_writable_descriptor_tables 1 41 42 /* 43 * If set, translation between the guest's 'pseudo-physical' address space 44 * and the host's machine address space are handled by the hypervisor. In this 45 * mode the guest does not need to perform phys-to/from-machine translations 46 * when performing page table operations. 47 */ 48 #define XENFEAT_auto_translated_physmap 2 49 50 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ 51 #define XENFEAT_supervisor_mode_kernel 3 52 53 /* 54 * If set, the guest does not need to allocate x86 PAE page directories 55 * below 4GB. This flag is usually implied by auto_translated_physmap. 56 */ 57 #define XENFEAT_pae_pgdir_above_4gb 4 58 59 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ 60 #define XENFEAT_mmu_pt_update_preserve_ad 5 61 62 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ 63 #define XENFEAT_highmem_assist 6 64 65 /* 66 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel 67 * available pte bits. 68 */ 69 #define XENFEAT_gnttab_map_avail_bits 7 70 71 #define XENFEAT_NR_SUBMAPS 1 72 73 #endif /* __XEN_PUBLIC_FEATURES_H__ */ 74 75 /* 76 * Local variables: 77 * mode: C 78 * c-set-style: "BSD" 79 * c-basic-offset: 4 80 * tab-width: 4 81 * indent-tabs-mode: nil 82 * End: 83 */ 84