features.h (3399B)
1/* SPDX-License-Identifier: MIT */ 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/* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ 46#define XENFEAT_highmem_assist 6 47 48/* 49 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel 50 * available pte bits. 51 */ 52#define XENFEAT_gnttab_map_avail_bits 7 53 54/* x86: Does this Xen host support the HVM callback vector type? */ 55#define XENFEAT_hvm_callback_vector 8 56 57/* x86: pvclock algorithm is safe to use on HVM */ 58#define XENFEAT_hvm_safe_pvclock 9 59 60/* x86: pirq can be used by HVM guests */ 61#define XENFEAT_hvm_pirqs 10 62 63/* operation as Dom0 is supported */ 64#define XENFEAT_dom0 11 65 66/* Xen also maps grant references at pfn = mfn. 67 * This feature flag is deprecated and should not be used. 68#define XENFEAT_grant_map_identity 12 69 */ 70 71/* Guest can use XENMEMF_vnode to specify virtual node for memory op. */ 72#define XENFEAT_memory_op_vnode_supported 13 73 74/* arm: Hypervisor supports ARM SMC calling convention. */ 75#define XENFEAT_ARM_SMCCC_supported 14 76 77/* 78 * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP 79 * must be located in lower 1MB, as required by ACPI Specification for IA-PC 80 * systems. 81 * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains 82 * the "linux" string. 83 */ 84#define XENFEAT_linux_rsdp_unrestricted 15 85 86/* 87 * A direct-mapped (or 1:1 mapped) domain is a domain for which its 88 * local pages have gfn == mfn. If a domain is direct-mapped, 89 * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped 90 * is set. 91 * 92 * If neither flag is set (e.g. older Xen releases) the assumptions are: 93 * - not auto_translated domains (x86 only) are always direct-mapped 94 * - on x86, auto_translated domains are not direct-mapped 95 * - on ARM, Dom0 is direct-mapped, DomUs are not 96 */ 97#define XENFEAT_not_direct_mapped 16 98#define XENFEAT_direct_mapped 17 99 100#define XENFEAT_NR_SUBMAPS 1 101 102#endif /* __XEN_PUBLIC_FEATURES_H__ */