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1/* SPDX-License-Identifier: MIT */2/******************************************************************************3 * features.h4 *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 can15 * update them via direct writes.16 */17#define XENFEAT_writable_page_tables 018 19/*20 * If set, the guest does not need to write-protect its segment descriptor21 * tables, and can update them via direct writes.22 */23#define XENFEAT_writable_descriptor_tables 124 25/*26 * If set, translation between the guest's 'pseudo-physical' address space27 * and the host's machine address space are handled by the hypervisor. In this28 * mode the guest does not need to perform phys-to/from-machine translations29 * when performing page table operations.30 */31#define XENFEAT_auto_translated_physmap 232 33/* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */34#define XENFEAT_supervisor_mode_kernel 335 36/*37 * If set, the guest does not need to allocate x86 PAE page directories38 * below 4GB. This flag is usually implied by auto_translated_physmap.39 */40#define XENFEAT_pae_pgdir_above_4gb 441 42/* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */43#define XENFEAT_mmu_pt_update_preserve_ad 544 45/* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */46#define XENFEAT_highmem_assist 647 48/*49 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel50 * available pte bits.51 */52#define XENFEAT_gnttab_map_avail_bits 753 54/* x86: Does this Xen host support the HVM callback vector type? */55#define XENFEAT_hvm_callback_vector 856 57/* x86: pvclock algorithm is safe to use on HVM */58#define XENFEAT_hvm_safe_pvclock 959 60/* x86: pirq can be used by HVM guests */61#define XENFEAT_hvm_pirqs 1062 63/* operation as Dom0 is supported */64#define XENFEAT_dom0 1165 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 1269 */70 71/* Guest can use XENMEMF_vnode to specify virtual node for memory op. */72#define XENFEAT_memory_op_vnode_supported 1373 74/* arm: Hypervisor supports ARM SMC calling convention. */75#define XENFEAT_ARM_SMCCC_supported 1476 77/*78 * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP79 * must be located in lower 1MB, as required by ACPI Specification for IA-PC80 * systems.81 * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains82 * the "linux" string.83 */84#define XENFEAT_linux_rsdp_unrestricted 1585 86/*87 * A direct-mapped (or 1:1 mapped) domain is a domain for which its88 * local pages have gfn == mfn. If a domain is direct-mapped,89 * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped90 * 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-mapped94 * - on x86, auto_translated domains are not direct-mapped95 * - on ARM, Dom0 is direct-mapped, DomUs are not96 */97#define XENFEAT_not_direct_mapped 1698#define XENFEAT_direct_mapped 1799 100#define XENFEAT_NR_SUBMAPS 1101 102#endif /* __XEN_PUBLIC_FEATURES_H__ */103