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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/******************************************************************************
*
* Copyright (c) 2007-2008, D G Murray <Derek.Murray@cl.cam.ac.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xc_private.h"
#include <errno.h>
int xc_gnttab_op(xc_interface *xch, int cmd, void * op, int op_size, int count)
{
int ret = 0;
DECLARE_HYPERCALL;
DECLARE_HYPERCALL_BOUNCE(op, count * op_size, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
if ( xc_hypercall_bounce_pre(xch, op) )
{
PERROR("Could not bounce buffer for grant table op hypercall");
goto out1;
}
hypercall.op = __HYPERVISOR_grant_table_op;
hypercall.arg[0] = cmd;
hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(op);
hypercall.arg[2] = count;
ret = do_xen_hypercall(xch, &hypercall);
xc_hypercall_bounce_post(xch, op);
out1:
return ret;
}
int xc_gnttab_get_version(xc_interface *xch, int domid)
{
struct gnttab_get_version query;
int rc;
query.dom = domid;
rc = xc_gnttab_op(xch, GNTTABOP_get_version, &query, sizeof(query),
1);
if ( rc < 0 )
return rc;
else
return query.version;
}
static void *_gnttab_map_table(xc_interface *xch, int domid, int *gnt_num)
{
int rc, i;
struct gnttab_query_size query;
struct gnttab_setup_table setup;
DECLARE_HYPERCALL_BUFFER(unsigned long, frame_list);
xen_pfn_t *pfn_list = NULL;
grant_entry_v1_t *gnt = NULL;
if ( !gnt_num )
return NULL;
query.dom = domid;
rc = xc_gnttab_op(xch, GNTTABOP_query_size, &query, sizeof(query), 1);
if ( rc || (query.status != GNTST_okay) )
{
ERROR("Could not query dom's grant size\n", domid);
return NULL;
}
*gnt_num = query.nr_frames * (PAGE_SIZE / sizeof(grant_entry_v1_t) );
frame_list = xc_hypercall_buffer_alloc(xch, frame_list, query.nr_frames * sizeof(unsigned long));
if ( !frame_list )
{
ERROR("Could not allocate frame_list in xc_gnttab_map_table\n");
return NULL;
}
pfn_list = malloc(query.nr_frames * sizeof(xen_pfn_t));
if ( !pfn_list )
{
ERROR("Could not allocate pfn_list in xc_gnttab_map_table\n");
goto err;
}
setup.dom = domid;
setup.nr_frames = query.nr_frames;
set_xen_guest_handle(setup.frame_list, frame_list);
/* XXX Any race with other setup_table hypercall? */
rc = xc_gnttab_op(xch, GNTTABOP_setup_table, &setup, sizeof(setup),
1);
if ( rc || (setup.status != GNTST_okay) )
{
ERROR("Could not get grant table frame list\n");
goto err;
}
for ( i = 0; i < setup.nr_frames; i++ )
pfn_list[i] = frame_list[i];
gnt = xc_map_foreign_pages(xch, domid, PROT_READ, pfn_list,
setup.nr_frames);
if ( !gnt )
{
ERROR("Could not map grant table\n");
goto err;
}
err:
if ( frame_list )
xc_hypercall_buffer_free(xch, frame_list);
if ( pfn_list )
free(pfn_list);
return gnt;
}
grant_entry_v1_t *xc_gnttab_map_table_v1(xc_interface *xch, int domid,
int *gnt_num)
{
if (xc_gnttab_get_version(xch, domid) == 2)
return NULL;
return _gnttab_map_table(xch, domid, gnt_num);
}
grant_entry_v2_t *xc_gnttab_map_table_v2(xc_interface *xch, int domid,
int *gnt_num)
{
if (xc_gnttab_get_version(xch, domid) != 2)
return NULL;
return _gnttab_map_table(xch, domid, gnt_num);
}
void *xc_gnttab_map_grant_ref(xc_gnttab *xcg,
uint32_t domid,
uint32_t ref,
int prot)
{
return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, 1, 0, prot,
&domid, &ref, -1, -1);
}
void *xc_gnttab_map_grant_refs(xc_gnttab *xcg,
uint32_t count,
uint32_t *domids,
uint32_t *refs,
int prot)
{
return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, count, 0,
prot, domids, refs, -1, -1);
}
void *xc_gnttab_map_domain_grant_refs(xc_gnttab *xcg,
uint32_t count,
uint32_t domid,
uint32_t *refs,
int prot)
{
return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, count,
XC_GRANT_MAP_SINGLE_DOMAIN,
prot, &domid, refs, -1, -1);
}
void *xc_gnttab_map_grant_ref_notify(xc_gnttab *xcg,
uint32_t domid,
uint32_t ref,
int prot,
uint32_t notify_offset,
evtchn_port_t notify_port)
{
return xcg->ops->u.gnttab.grant_map(xcg, xcg->ops_handle, 1, 0, prot,
&domid, &ref, notify_offset, notify_port);
}
int xc_gnttab_munmap(xc_gnttab *xcg,
void *start_address,
uint32_t count)
{
return xcg->ops->u.gnttab.munmap(xcg, xcg->ops_handle,
start_address, count);
}
int xc_gnttab_set_max_grants(xc_gnttab *xcg, uint32_t count)
{
if (!xcg->ops->u.gnttab.set_max_grants)
return 0;
return xcg->ops->u.gnttab.set_max_grants(xcg, xcg->ops_handle, count);
}
void *xc_gntshr_share_pages(xc_gntshr *xcg, uint32_t domid,
int count, uint32_t *refs, int writable)
{
return xcg->ops->u.gntshr.share_pages(xcg, xcg->ops_handle, domid,
count, refs, writable, -1, -1);
}
void *xc_gntshr_share_page_notify(xc_gntshr *xcg, uint32_t domid,
uint32_t *ref, int writable,
uint32_t notify_offset,
evtchn_port_t notify_port)
{
return xcg->ops->u.gntshr.share_pages(xcg, xcg->ops_handle,
domid, 1, ref, writable, notify_offset, notify_port);
}
/*
* Unmaps the @count pages starting at @start_address, which were mapped by a
* call to xc_gntshr_share_*. Never logs.
*/
int xc_gntshr_munmap(xc_gntshr *xcg, void *start_address, uint32_t count)
{
return xcg->ops->u.gntshr.munmap(xcg, xcg->ops_handle,
start_address, count);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
