The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/features.h

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    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@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 #define XENFEAT_NR_SUBMAPS 1
  106 
  107 #endif /* __XEN_PUBLIC_FEATURES_H__ */
  108 
  109 /*
  110  * Local variables:
  111  * mode: C
  112  * c-file-style: "BSD"
  113  * c-basic-offset: 4
  114  * tab-width: 4
  115  * indent-tabs-mode: nil
  116  * End:
  117  */

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