1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/******************************************************************************
* gnttab.h
*
* Two sets of functionality:
* 1. Granting foreign access to our memory reservation.
* 2. Accessing others' memory reservations via grant references.
* (i.e., mechanisms for both sender and recipient of grant references)
*
* Copyright (c) 2004-2005, K A Fraser
* Copyright (c) 2005, Christopher Clark
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __ASM_GNTTAB_H__
#include <xen/xen-os.h>
#include <xen/hypervisor.h>
#include <xen/features.h>
#include <xen/interface/grant_table.h>
#define GNTTAB_LIST_END GRANT_REF_INVALID
struct gnttab_free_callback {
struct gnttab_free_callback *next;
void (*fn)(void *);
void *arg;
uint16_t count;
};
int gnttab_init(void);
/*
* Allocate a grant table reference and return it in *result. Returns
* zero on success or errno on error.
*/
int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
int flags, grant_ref_t *result);
/*
* End access through the given grant reference, iff the grant entry is no
* longer in use. Return 1 if the grant entry was freed, 0 if it is still in
* use.
*/
int gnttab_end_foreign_access_ref(grant_ref_t ref);
/*
* Eventually end access through the given grant reference, and once that
* access has been ended, free the given page too. Access will be ended
* immediately iff the grant entry is not in use, otherwise it will happen
* some time later. page may be 0, in which case no freeing will occur.
*/
void gnttab_end_foreign_access(grant_ref_t ref, void *page);
/*
* Eventually end access through the given array of grant references.
* Access will be ended immediately iff the grant entry is not in use,
* otherwise it will happen some time later
*/
void gnttab_end_foreign_access_references(u_int count, grant_ref_t *refs);
int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn, grant_ref_t *result);
unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
int gnttab_query_foreign_access(grant_ref_t ref);
/*
* operations on reserved batches of grant references
*/
int gnttab_alloc_grant_references(uint16_t count, grant_ref_t *pprivate_head);
void gnttab_free_grant_reference(grant_ref_t ref);
void gnttab_free_grant_references(grant_ref_t head);
int gnttab_empty_grant_references(const grant_ref_t *pprivate_head);
int gnttab_claim_grant_reference(grant_ref_t *pprivate_head);
void gnttab_release_grant_reference(grant_ref_t *private_head,
grant_ref_t release);
void gnttab_request_free_callback(struct gnttab_free_callback *callback,
void (*fn)(void *), void *arg, uint16_t count);
void gnttab_cancel_free_callback(struct gnttab_free_callback *callback);
void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int flags);
void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
unsigned long pfn);
int gnttab_suspend(void);
int gnttab_resume(void);
#if 0
#include <xen/features.h>
static inline void
gnttab_set_map_op(struct gnttab_map_grant_ref *map, vm_paddr_t addr,
uint32_t flags, grant_ref_t ref, domid_t domid)
{
if (flags & GNTMAP_contains_pte)
map->host_addr = addr;
else if (xen_feature(XENFEAT_auto_translated_physmap))
map->host_addr = vtophys(addr);
else
map->host_addr = addr;
map->flags = flags;
map->ref = ref;
map->dom = domid;
}
static inline void
gnttab_set_unmap_op(struct gnttab_unmap_grant_ref *unmap, vm_paddr_t addr,
uint32_t flags, grant_handle_t handle)
{
if (flags & GNTMAP_contains_pte)
unmap->host_addr = addr;
else if (xen_feature(XENFEAT_auto_translated_physmap))
unmap->host_addr = vtophys(addr);
else
unmap->host_addr = addr;
unmap->handle = handle;
unmap->dev_bus_addr = 0;
}
static inline void
gnttab_set_replace_op(struct gnttab_unmap_and_replace *unmap, vm_paddr_t addr,
vm_paddr_t new_addr, grant_handle_t handle)
{
if (xen_feature(XENFEAT_auto_translated_physmap)) {
unmap->host_addr = vtophys(addr);
unmap->new_addr = vtophys(new_addr);
} else {
unmap->host_addr = addr;
unmap->new_addr = new_addr;
}
unmap->handle = handle;
}
#endif
#endif /* __ASM_GNTTAB_H__ */
|
