features.h revision 251767 
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/* x86: Does this Xen host support the HVM callback vector type? */
72#define XENFEAT_hvm_callback_vector        8
73
74/* x86: pvclock algorithm is safe to use on HVM */
75#define XENFEAT_hvm_safe_pvclock           9
76
77/* x86: pirq can be used by HVM guests */
78#define XENFEAT_hvm_pirqs                 10
79
80/* operation as Dom0 is supported */
81#define XENFEAT_dom0                      11
82
83#define XENFEAT_NR_SUBMAPS 1
84
85#endif /* __XEN_PUBLIC_FEATURES_H__ */
86
87/*
88 * Local variables:
89 * mode: C
90 * c-set-style: "BSD"
91 * c-basic-offset: 4
92 * tab-width: 4
93 * indent-tabs-mode: nil
94 * End:
95 */
96