xref: /titanic_41/usr/src/uts/common/xen/public/features.h (revision e4d060fb4c00d44cd578713eb9a921f594b733b8)
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  */
84