CoCalc -- features.h

GitHub Repository: torvalds/linux
Path: blob/master/include/xen/interface/features.h
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/* SPDX-License-Identifier: MIT */
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/******************************************************************************
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 * features.h
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 *
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 * Feature flags, reported by XENVER_get_features.
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 *
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 * Copyright (c) 2006, Keir Fraser <[email protected]>
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 */
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#ifndef __XEN_PUBLIC_FEATURES_H__
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#define __XEN_PUBLIC_FEATURES_H__
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/*
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 * If set, the guest does not need to write-protect its pagetables, and can
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 * update them via direct writes.
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 */
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#define XENFEAT_writable_page_tables       0
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/*
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 * If set, the guest does not need to write-protect its segment descriptor
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 * tables, and can update them via direct writes.
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 */
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#define XENFEAT_writable_descriptor_tables 1
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/*
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 * If set, translation between the guest's 'pseudo-physical' address space
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 * and the host's machine address space are handled by the hypervisor. In this
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 * mode the guest does not need to perform phys-to/from-machine translations
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 * when performing page table operations.
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 */
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#define XENFEAT_auto_translated_physmap    2
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/* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
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#define XENFEAT_supervisor_mode_kernel     3
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/*
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 * If set, the guest does not need to allocate x86 PAE page directories
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 * below 4GB. This flag is usually implied by auto_translated_physmap.
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 */
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#define XENFEAT_pae_pgdir_above_4gb        4
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/* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
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#define XENFEAT_mmu_pt_update_preserve_ad  5
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/* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */
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#define XENFEAT_highmem_assist             6
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/*
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 * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
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 * available pte bits.
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 */
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#define XENFEAT_gnttab_map_avail_bits      7
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/* x86: Does this Xen host support the HVM callback vector type? */
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#define XENFEAT_hvm_callback_vector        8
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/* x86: pvclock algorithm is safe to use on HVM */
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#define XENFEAT_hvm_safe_pvclock           9
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/* x86: pirq can be used by HVM guests */
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#define XENFEAT_hvm_pirqs           10
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/* operation as Dom0 is supported */
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#define XENFEAT_dom0                      11
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/* Xen also maps grant references at pfn = mfn.
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 * This feature flag is deprecated and should not be used.
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#define XENFEAT_grant_map_identity        12
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 */
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/* Guest can use XENMEMF_vnode to specify virtual node for memory op. */
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#define XENFEAT_memory_op_vnode_supported 13
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/* arm: Hypervisor supports ARM SMC calling convention. */
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#define XENFEAT_ARM_SMCCC_supported       14
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/*
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 * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP
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 * must be located in lower 1MB, as required by ACPI Specification for IA-PC
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 * systems.
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 * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains
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 * the "linux" string.
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 */
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#define XENFEAT_linux_rsdp_unrestricted   15
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/*
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 * A direct-mapped (or 1:1 mapped) domain is a domain for which its
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 * local pages have gfn == mfn. If a domain is direct-mapped,
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 * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped
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 * is set.
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 *
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 * If neither flag is set (e.g. older Xen releases) the assumptions are:
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 * - not auto_translated domains (x86 only) are always direct-mapped
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 * - on x86, auto_translated domains are not direct-mapped
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 * - on ARM, Dom0 is direct-mapped, DomUs are not
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 */
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#define XENFEAT_not_direct_mapped         16
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#define XENFEAT_direct_mapped             17
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#define XENFEAT_NR_SUBMAPS 1
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#endif /* __XEN_PUBLIC_FEATURES_H__ */
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