| 1 | /* SPDX-License-Identifier: MIT */ |
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| 2 | /****************************************************************************** |
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| 3 | * features.h |
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| 4 | * |
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| 5 | * Feature flags, reported by XENVER_get_features. |
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| 6 | * |
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| 7 | * Copyright (c) 2006, Keir Fraser <keir@xensource.com> |
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| 8 | */ |
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| 9 | |
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| 10 | #ifndef __XEN_PUBLIC_FEATURES_H__ |
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| 11 | #define __XEN_PUBLIC_FEATURES_H__ |
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| 12 | |
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| 13 | /* |
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| 14 | * If set, the guest does not need to write-protect its pagetables, and can |
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| 15 | * update them via direct writes. |
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| 16 | */ |
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| 17 | #define XENFEAT_writable_page_tables 0 |
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| 18 | |
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| 19 | /* |
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| 20 | * If set, the guest does not need to write-protect its segment descriptor |
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| 21 | * tables, and can update them via direct writes. |
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| 22 | */ |
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| 23 | #define XENFEAT_writable_descriptor_tables 1 |
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| 24 | |
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| 25 | /* |
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| 26 | * If set, translation between the guest's 'pseudo-physical' address space |
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| 27 | * and the host's machine address space are handled by the hypervisor. In this |
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| 28 | * mode the guest does not need to perform phys-to/from-machine translations |
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| 29 | * when performing page table operations. |
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| 30 | */ |
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| 31 | #define XENFEAT_auto_translated_physmap 2 |
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| 32 | |
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| 33 | /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ |
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| 34 | #define XENFEAT_supervisor_mode_kernel 3 |
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| 35 | |
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| 36 | /* |
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| 37 | * If set, the guest does not need to allocate x86 PAE page directories |
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| 38 | * below 4GB. This flag is usually implied by auto_translated_physmap. |
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| 39 | */ |
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| 40 | #define XENFEAT_pae_pgdir_above_4gb 4 |
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| 41 | |
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| 42 | /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ |
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| 43 | #define XENFEAT_mmu_pt_update_preserve_ad 5 |
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| 44 | |
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| 45 | /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ |
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| 46 | #define XENFEAT_highmem_assist 6 |
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| 47 | |
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| 48 | /* |
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| 49 | * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel |
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| 50 | * available pte bits. |
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| 51 | */ |
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| 52 | #define XENFEAT_gnttab_map_avail_bits 7 |
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| 53 | |
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| 54 | /* x86: Does this Xen host support the HVM callback vector type? */ |
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| 55 | #define XENFEAT_hvm_callback_vector 8 |
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| 56 | |
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| 57 | /* x86: pvclock algorithm is safe to use on HVM */ |
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| 58 | #define XENFEAT_hvm_safe_pvclock 9 |
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| 59 | |
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| 60 | /* x86: pirq can be used by HVM guests */ |
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| 61 | #define XENFEAT_hvm_pirqs 10 |
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| 62 | |
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| 63 | /* operation as Dom0 is supported */ |
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| 64 | #define XENFEAT_dom0 11 |
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| 65 | |
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| 66 | /* Xen also maps grant references at pfn = mfn. |
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| 67 | * This feature flag is deprecated and should not be used. |
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| 68 | #define XENFEAT_grant_map_identity 12 |
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| 69 | */ |
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| 70 | |
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| 71 | /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */ |
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| 72 | #define XENFEAT_memory_op_vnode_supported 13 |
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| 73 | |
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| 74 | /* arm: Hypervisor supports ARM SMC calling convention. */ |
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| 75 | #define XENFEAT_ARM_SMCCC_supported 14 |
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| 76 | |
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| 77 | /* |
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| 78 | * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP |
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| 79 | * must be located in lower 1MB, as required by ACPI Specification for IA-PC |
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| 80 | * systems. |
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| 81 | * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains |
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| 82 | * the "linux" string. |
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| 83 | */ |
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| 84 | #define XENFEAT_linux_rsdp_unrestricted 15 |
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| 85 | |
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| 86 | /* |
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| 87 | * A direct-mapped (or 1:1 mapped) domain is a domain for which its |
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| 88 | * local pages have gfn == mfn. If a domain is direct-mapped, |
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| 89 | * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped |
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| 90 | * is set. |
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| 91 | * |
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| 92 | * If neither flag is set (e.g. older Xen releases) the assumptions are: |
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| 93 | * - not auto_translated domains (x86 only) are always direct-mapped |
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| 94 | * - on x86, auto_translated domains are not direct-mapped |
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| 95 | * - on ARM, Dom0 is direct-mapped, DomUs are not |
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| 96 | */ |
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| 97 | #define XENFEAT_not_direct_mapped 16 |
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| 98 | #define XENFEAT_direct_mapped 17 |
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| 99 | |
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| 100 | #define XENFEAT_NR_SUBMAPS 1 |
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| 101 | |
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| 102 | #endif /* __XEN_PUBLIC_FEATURES_H__ */ |
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| 103 | |
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