usr/src/uts/common/xen/public/features.h

   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  * If set, the guest does not need to write-protect its pagetables, and can
  32  * update them via direct writes.
  33  */
  34 #define XENFEAT_writable_page_tables       0
  35
  36 /*
  37  * If set, the guest does not need to write-protect its segment descriptor
  38  * tables, and can update them via direct writes.
  39  */
  40 #define XENFEAT_writable_descriptor_tables 1
  41
  42 /*
  43  * If set, translation between the guest's 'pseudo-physical' address space
  44  * and the host's machine address space are handled by the hypervisor. In this
  45  * mode the guest does not need to perform phys-to/from-machine translations
  46  * when performing page table operations.
  47  */
  48 #define XENFEAT_auto_translated_physmap    2
  49
  50 /* If set, the guest is running in supervisor mode (e.g., x86 ring 0). */
  51 #define XENFEAT_supervisor_mode_kernel     3
  52
  53 /*
  54  * If set, the guest does not need to allocate x86 PAE page directories
  55  * below 4GB. This flag is usually implied by auto_translated_physmap.
  56  */
  57 #define XENFEAT_pae_pgdir_above_4gb        4
  58
  59 /* x86: Does this Xen host support the MMU_PT_UPDATE_PRESERVE_AD hypercall? */
  60 #define XENFEAT_mmu_pt_update_preserve_ad  5
  61
  62 /* x86: Does this Xen host support the MMU_{CLEAR,COPY}_PAGE hypercall? */
  63 #define XENFEAT_highmem_assist             6
  64
  65 /*
  66  * If set, GNTTABOP_map_grant_ref honors flags to be placed into guest kernel
  67  * available pte bits.
  68  */
  69 #define XENFEAT_gnttab_map_avail_bits      7
  70
  71 #define XENFEAT_NR_SUBMAPS 1
  72
  73 #endif /* __XEN_PUBLIC_FEATURES_H__ */
  74
  75 /*
  76  * Local variables:
  77  * mode: C
  78  * c-set-style: "BSD"
  79  * c-basic-offset: 4
  80  * tab-width: 4
  81  * indent-tabs-mode: nil
  82  * End:
  83  */