| /* SPDX-License-Identifier: MIT */ |
| /****************************************************************************** |
| * features.h |
| * |
| * Feature flags, reported by XENVER_get_features. |
| * |
| * Copyright (c) 2006, Keir Fraser <keir@xensource.com> |
| */ |
| |
| #ifndef __XEN_PUBLIC_FEATURES_H__ |
| #define __XEN_PUBLIC_FEATURES_H__ |
| |
| /* |
| * `incontents 200 elfnotes_features XEN_ELFNOTE_FEATURES |
| * |
| * The list of all the features the guest supports. They are set by |
| * parsing the XEN_ELFNOTE_FEATURES and XEN_ELFNOTE_SUPPORTED_FEATURES |
| * string. The format is the feature names (as given here without the |
| * "XENFEAT_" prefix) separated by '|' characters. |
| * If a feature is required for the kernel to function then the feature name |
| * must be preceded by a '!' character. |
| * |
| * Note that if XEN_ELFNOTE_SUPPORTED_FEATURES is used, then in the |
| * XENFEAT_dom0 MUST be set if the guest is to be booted as dom0, |
| */ |
| |
| /* |
| * If set, the guest does not need to write-protect its pagetables, and can |
| * update them via direct writes. |
| */ |
| #define XENFEAT_writable_page_tables 0 |
| |
| /* |
| * If set, the guest does not need to write-protect its segment descriptor |
| * tables, and can update them via direct writes. |
| */ |
| #define XENFEAT_writable_descriptor_tables 1 |
| |
| /* |
| * If set, translation between the guest's 'pseudo-physical' address space |
| * and the host's machine address space are handled by the hypervisor. In this |
| * mode the guest does not need to perform phys-to/from-machine translations |
| * when performing page table operations. |
| */ |
| #define XENFEAT_auto_translated_physmap 2 |
| |
| /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */ |
| #define XENFEAT_supervisor_mode_kernel 3 |
| |
| /* |
| * If set, the guest does not need to allocate x86 PAE page directories |
| * below 4GB. This flag is usually implied by auto_translated_physmap. |
| */ |
| #define XENFEAT_pae_pgdir_above_4gb 4 |
| |
| /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */ |
| #define XENFEAT_mmu_pt_update_preserve_ad 5 |
| |
| /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */ |
| #define XENFEAT_highmem_assist 6 |
| |
| /* |
| * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel |
| * available pte bits. |
| */ |
| #define XENFEAT_gnttab_map_avail_bits 7 |
| |
| /* x86: Does this Xen host support the HVM callback vector type? */ |
| #define XENFEAT_hvm_callback_vector 8 |
| |
| /* x86: pvclock algorithm is safe to use on HVM */ |
| #define XENFEAT_hvm_safe_pvclock 9 |
| |
| /* x86: pirq can be used by HVM guests */ |
| #define XENFEAT_hvm_pirqs 10 |
| |
| /* operation as Dom0 is supported */ |
| #define XENFEAT_dom0 11 |
| |
| /* Xen also maps grant references at pfn = mfn. |
| * This feature flag is deprecated and should not be used. |
| #define XENFEAT_grant_map_identity 12 |
| */ |
| |
| /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */ |
| #define XENFEAT_memory_op_vnode_supported 13 |
| |
| /* arm: Hypervisor supports ARM SMC calling convention. */ |
| #define XENFEAT_ARM_SMCCC_supported 14 |
| |
| /* |
| * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP |
| * must be located in lower 1MB, as required by ACPI Specification for IA-PC |
| * systems. |
| * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains |
| * the "linux" string. |
| */ |
| #define XENFEAT_linux_rsdp_unrestricted 15 |
| |
| /* |
| * A direct-mapped (or 1:1 mapped) domain is a domain for which its |
| * local pages have gfn == mfn. If a domain is direct-mapped, |
| * XENFEAT_direct_mapped is set; otherwise XENFEAT_not_direct_mapped |
| * is set. |
| * |
| * If neither flag is set (e.g. older Xen releases) the assumptions are: |
| * - not auto_translated domains (x86 only) are always direct-mapped |
| * - on x86, auto_translated domains are not direct-mapped |
| * - on ARM, Dom0 is direct-mapped, DomUs are not |
| */ |
| #define XENFEAT_not_direct_mapped 16 |
| #define XENFEAT_direct_mapped 17 |
| |
| #define XENFEAT_NR_SUBMAPS 1 |
| |
| #endif /* __XEN_PUBLIC_FEATURES_H__ */ |
| |
| /* |
| * Local variables: |
| * mode: C |
| * c-file-style: "BSD" |
| * c-basic-offset: 4 |
| * tab-width: 4 |
| * indent-tabs-mode: nil |
| * End: |
| */ |
