1 /****************************************************************************** 2 * features.h 3 * 4 * Feature flags, reported by XENVER_get_features. 5 * 6 * Copyright (c) 2006, Keir Fraser <keir@xensource.com> 7 */ 8 9 #ifndef __XEN_PUBLIC_FEATURES_H__ 10 #define __XEN_PUBLIC_FEATURES_H__ 11 12 /* 13 * If set, the guest does not need to write-protect its pagetables, and can 14 * update them via direct writes. 15 */ 16 #define XENFEAT_writable_page_tables 0 17 18 /* 19 * If set, the guest does not need to write-protect its segment descriptor 20 * tables, and can update them via direct writes. 21 */ 22 #define XENFEAT_writable_descriptor_tables 1 23 24 /* 25 * If set, translation between the guest's 'pseudo-physical' address space 26 * and the host's machine address space are handled by the hypervisor. In this 27 * mode the guest does not need to perform phys-to/from-machine translations 28 * when performing page table operations. 29 */ 30 #define XENFEAT_auto_translated_physmap 2 31 32 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ 33 #define XENFEAT_supervisor_mode_kernel 3 34 35 /* 36 * If set, the guest does not need to allocate x86 PAE page directories 37 * below 4GB. This flag is usually implied by auto_translated_physmap. 38 */ 39 #define XENFEAT_pae_pgdir_above_4gb 4 40 41 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ 42 #define XENFEAT_mmu_pt_update_preserve_ad 5 43 44 /* x86: Does this Xen host support the HVM callback vector type? */ 45 #define XENFEAT_hvm_callback_vector 8 46 47 /* x86: pvclock algorithm is safe to use on HVM */ 48 #define XENFEAT_hvm_safe_pvclock 9 49 50 /* x86: pirq can be used by HVM guests */ 51 #define XENFEAT_hvm_pirqs 10 52 53 #define XENFEAT_NR_SUBMAPS 1 54 55 #endif /* __XEN_PUBLIC_FEATURES_H__ */ 56