1 /* SPDX-License-Identifier: GPL-2.0 */ 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 * If set, the guest does not need to write-protect its pagetables, and can 15 * update them via direct writes. 16 */ 17 #define XENFEAT_writable_page_tables 0 18 19 /* 20 * If set, the guest does not need to write-protect its segment descriptor 21 * tables, and can update them via direct writes. 22 */ 23 #define XENFEAT_writable_descriptor_tables 1 24 25 /* 26 * If set, translation between the guest's 'pseudo-physical' address space 27 * and the host's machine address space are handled by the hypervisor. In this 28 * mode the guest does not need to perform phys-to/from-machine translations 29 * when performing page table operations. 30 */ 31 #define XENFEAT_auto_translated_physmap 2 32 33 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ 34 #define XENFEAT_supervisor_mode_kernel 3 35 36 /* 37 * If set, the guest does not need to allocate x86 PAE page directories 38 * below 4GB. This flag is usually implied by auto_translated_physmap. 39 */ 40 #define XENFEAT_pae_pgdir_above_4gb 4 41 42 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ 43 #define XENFEAT_mmu_pt_update_preserve_ad 5 44 45 /* 46 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel 47 * available pte bits. 48 */ 49 #define XENFEAT_gnttab_map_avail_bits 7 50 51 /* x86: Does this Xen host support the HVM callback vector type? */ 52 #define XENFEAT_hvm_callback_vector 8 53 54 /* x86: pvclock algorithm is safe to use on HVM */ 55 #define XENFEAT_hvm_safe_pvclock 9 56 57 /* x86: pirq can be used by HVM guests */ 58 #define XENFEAT_hvm_pirqs 10 59 60 /* operation as Dom0 is supported */ 61 #define XENFEAT_dom0 11 62 63 #define XENFEAT_NR_SUBMAPS 1 64 65 #endif /* __XEN_PUBLIC_FEATURES_H__ */ 66