Home | History | Annotate | Line # | Download | only in public 
      1 /******************************************************************************
      2  * features.h
      3  *
      4  * Feature flags, reported by XENVER_get_features.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a copy
      7  * of this software and associated documentation files (the "Software"), to
      8  * deal in the Software without restriction, including without limitation the
      9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     10  * sell copies of the Software, and to permit persons to whom the Software is
     11  * furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     22  * DEALINGS IN THE SOFTWARE.
     23  *
     24  * Copyright (c) 2006, Keir Fraser <keir (at) xensource.com>
     25  */
     26 
     27 #ifndef __XEN_PUBLIC_FEATURES_H__
     28 #define __XEN_PUBLIC_FEATURES_H__
     29 
     30 /*
     31  * `incontents 200 elfnotes_features XEN_ELFNOTE_FEATURES
     32  *
     33  * The list of all the features the guest supports. They are set by
     34  * parsing the XEN_ELFNOTE_FEATURES and XEN_ELFNOTE_SUPPORTED_FEATURES
     35  * string. The format is the  feature names (as given here without the
     36  * "XENFEAT_" prefix) separated by '|' characters.
     37  * If a feature is required for the kernel to function then the feature name
     38  * must be preceded by a '!' character.
     39  *
     40  * Note that if XEN_ELFNOTE_SUPPORTED_FEATURES is used, then in the
     41  * XENFEAT_dom0 MUST be set if the guest is to be booted as dom0,
     42  */
     43 
     44 /*
     45  * If set, the guest does not need to write-protect its pagetables, and can
     46  * update them via direct writes.
     47  */
     48 #define XENFEAT_writable_page_tables       0
     49 
     50 /*
     51  * If set, the guest does not need to write-protect its segment descriptor
     52  * tables, and can update them via direct writes.
     53  */
     54 #define XENFEAT_writable_descriptor_tables 1
     55 
     56 /*
     57  * If set, translation between the guest's 'pseudo-physical' address space
     58  * and the host's machine address space are handled by the hypervisor. In this
     59  * mode the guest does not need to perform phys-to/from-machine translations
     60  * when performing page table operations.
     61  */
     62 #define XENFEAT_auto_translated_physmap    2
     63 
     64 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
     65 #define XENFEAT_supervisor_mode_kernel     3
     66 
     67 /*
     68  * If set, the guest does not need to allocate x86 PAE page directories
     69  * below 4GB. This flag is usually implied by auto_translated_physmap.
     70  */
     71 #define XENFEAT_pae_pgdir_above_4gb        4
     72 
     73 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
     74 #define XENFEAT_mmu_pt_update_preserve_ad  5
     75 
     76 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */
     77 #define XENFEAT_highmem_assist             6
     78 
     79 /*
     80  * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
     81  * available pte bits.
     82  */
     83 #define XENFEAT_gnttab_map_avail_bits      7
     84 
     85 /* x86: Does this Xen host support the HVM callback vector type? */
     86 #define XENFEAT_hvm_callback_vector        8
     87 
     88 /* x86: pvclock algorithm is safe to use on HVM */
     89 #define XENFEAT_hvm_safe_pvclock           9
     90 
     91 /* x86: pirq can be used by HVM guests */
     92 #define XENFEAT_hvm_pirqs                 10
     93 
     94 /* operation as Dom0 is supported */
     95 #define XENFEAT_dom0                      11
     96 
     97 /* Xen also maps grant references at pfn = mfn.
     98  * This feature flag is deprecated and should not be used.
     99 #define XENFEAT_grant_map_identity        12
    100  */
    101 
    102 /* Guest can use XENMEMF_vnode to specify virtual node for memory op. */
    103 #define XENFEAT_memory_op_vnode_supported 13
    104 
    105 /* arm: Hypervisor supports ARM SMC calling convention. */
    106 #define XENFEAT_ARM_SMCCC_supported       14
    107 
    108 /*
    109  * x86/PVH: If set, ACPI RSDP can be placed at any address. Otherwise RSDP
    110  * must be located in lower 1MB, as required by ACPI Specification for IA-PC
    111  * systems.
    112  * This feature flag is only consulted if XEN_ELFNOTE_GUEST_OS contains
    113  * the "linux" string.
    114  */
    115 #define XENFEAT_linux_rsdp_unrestricted   15
    116 
    117 #define XENFEAT_NR_SUBMAPS 1
    118 
    119 #endif /* __XEN_PUBLIC_FEATURES_H__ */
    120 
    121 /*
    122  * Local variables:
    123  * mode: C
    124  * c-file-style: "BSD"
    125  * c-basic-offset: 4
    126  * tab-width: 4
    127  * indent-tabs-mode: nil
    128  * End:
    129  */
    130