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
|
/******************************************************************************
* arch/ia64/xen/grant-table.c
*
* Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
#include <xen/grant_table.h>
#include <asm/xen/hypervisor.h>
struct vm_struct *xen_alloc_vm_area(unsigned long size)
{
int order;
unsigned long virt;
unsigned long nr_pages;
struct vm_struct *area;
order = get_order(size);
virt = __get_free_pages(GFP_KERNEL, order);
if (virt == 0)
goto err0;
nr_pages = 1 << order;
scrub_pages(virt, nr_pages);
area = kmalloc(sizeof(*area), GFP_KERNEL);
if (area == NULL)
goto err1;
area->flags = VM_IOREMAP;
area->addr = (void *)virt;
area->size = size;
area->pages = NULL;
area->nr_pages = nr_pages;
area->phys_addr = 0; /* xenbus_map_ring_valloc uses this field! */
return area;
err1:
free_pages(virt, order);
err0:
return NULL;
}
EXPORT_SYMBOL_GPL(xen_alloc_vm_area);
void xen_free_vm_area(struct vm_struct *area)
{
unsigned int order = get_order(area->size);
unsigned long i;
unsigned long phys_addr = __pa(area->addr);
/* This area is used for foreign page mappping.
* So underlying machine page may not be assigned. */
for (i = 0; i < (1 << order); i++) {
unsigned long ret;
unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
struct xen_memory_reservation reservation = {
.nr_extents = 1,
.address_bits = 0,
.extent_order = 0,
.domid = DOMID_SELF
};
set_xen_guest_handle(reservation.extent_start, &gpfn);
ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
&reservation);
BUG_ON(ret != 1);
}
free_pages((unsigned long)area->addr, order);
kfree(area);
}
EXPORT_SYMBOL_GPL(xen_free_vm_area);
/****************************************************************************
* grant table hack
* cmd: GNTTABOP_xxx
*/
int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
unsigned long max_nr_gframes,
struct grant_entry **__shared)
{
*__shared = __va(frames[0] << PAGE_SHIFT);
return 0;
}
void arch_gnttab_unmap_shared(struct grant_entry *shared,
unsigned long nr_gframes)
{
/* nothing */
}
static void
gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
{
uint32_t flags;
flags = uop->flags;
if (flags & GNTMAP_host_map) {
if (flags & GNTMAP_application_map) {
printk(KERN_DEBUG
"GNTMAP_application_map is not supported yet: "
"flags 0x%x\n", flags);
BUG();
}
if (flags & GNTMAP_contains_pte) {
printk(KERN_DEBUG
"GNTMAP_contains_pte is not supported yet: "
"flags 0x%x\n", flags);
BUG();
}
} else if (flags & GNTMAP_device_map) {
printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
BUG(); /* not yet. actually this flag is not used. */
} else {
BUG();
}
}
int
HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
{
if (cmd == GNTTABOP_map_grant_ref) {
unsigned int i;
for (i = 0; i < count; i++) {
gnttab_map_grant_ref_pre(
(struct gnttab_map_grant_ref *)uop + i);
}
}
return xencomm_hypercall_grant_table_op(cmd, uop, count);
}
EXPORT_SYMBOL(HYPERVISOR_grant_table_op);
|
