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8d3d2106 IY |
1 | /****************************************************************************** |
2 | * grant_table.c | |
3 | * x86 specific part | |
4 | * | |
5 | * Granting foreign access to our memory reservation. | |
6 | * | |
7 | * Copyright (c) 2005-2006, Christopher Clark | |
8 | * Copyright (c) 2004-2005, K A Fraser | |
9 | * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp> | |
10 | * VA Linux Systems Japan. Split out x86 specific part. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License version 2 | |
14 | * as published by the Free Software Foundation; or, when distributed | |
15 | * separately from the Linux kernel or incorporated into other | |
16 | * software packages, subject to the following license: | |
17 | * | |
18 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
19 | * of this source file (the "Software"), to deal in the Software without | |
20 | * restriction, including without limitation the rights to use, copy, modify, | |
21 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
22 | * and to permit persons to whom the Software is furnished to do so, subject to | |
23 | * the following conditions: | |
24 | * | |
25 | * The above copyright notice and this permission notice shall be included in | |
26 | * all copies or substantial portions of the Software. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
29 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
30 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
31 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
32 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
33 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
34 | * IN THE SOFTWARE. | |
35 | */ | |
36 | ||
37 | #include <linux/sched.h> | |
38 | #include <linux/mm.h> | |
162e3717 | 39 | #include <linux/slab.h> |
8d3d2106 IY |
40 | #include <linux/vmalloc.h> |
41 | ||
42 | #include <xen/interface/xen.h> | |
43 | #include <xen/page.h> | |
44 | #include <xen/grant_table.h> | |
162e3717 | 45 | #include <xen/xen.h> |
8d3d2106 IY |
46 | |
47 | #include <asm/pgtable.h> | |
48 | ||
162e3717 DV |
49 | static struct gnttab_vm_area { |
50 | struct vm_struct *area; | |
51 | pte_t **ptes; | |
438b33c7 | 52 | } gnttab_shared_vm_area; |
162e3717 DV |
53 | |
54 | int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes, | |
55 | unsigned long max_nr_gframes, | |
56 | void **__shared) | |
8d3d2106 | 57 | { |
162e3717 DV |
58 | void *shared = *__shared; |
59 | unsigned long addr; | |
60 | unsigned long i; | |
8d3d2106 | 61 | |
162e3717 DV |
62 | if (shared == NULL) |
63 | *__shared = shared = gnttab_shared_vm_area.area->addr; | |
8d3d2106 | 64 | |
162e3717 DV |
65 | addr = (unsigned long)shared; |
66 | ||
67 | for (i = 0; i < nr_gframes; i++) { | |
68 | set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i], | |
69 | mfn_pte(frames[i], PAGE_KERNEL)); | |
70 | addr += PAGE_SIZE; | |
71 | } | |
85ff6acb | 72 | |
85ff6acb AL |
73 | return 0; |
74 | } | |
75 | ||
162e3717 | 76 | void arch_gnttab_unmap(void *shared, unsigned long nr_gframes) |
8d3d2106 | 77 | { |
162e3717 DV |
78 | unsigned long addr; |
79 | unsigned long i; | |
8d3d2106 | 80 | |
162e3717 DV |
81 | addr = (unsigned long)shared; |
82 | ||
83 | for (i = 0; i < nr_gframes; i++) { | |
438b33c7 DV |
84 | set_pte_at(&init_mm, addr, gnttab_shared_vm_area.ptes[i], |
85 | __pte(0)); | |
162e3717 DV |
86 | addr += PAGE_SIZE; |
87 | } | |
8d3d2106 IY |
88 | } |
89 | ||
162e3717 | 90 | static int arch_gnttab_valloc(struct gnttab_vm_area *area, unsigned nr_frames) |
85ff6acb | 91 | { |
162e3717 DV |
92 | area->ptes = kmalloc(sizeof(pte_t *) * nr_frames, GFP_KERNEL); |
93 | if (area->ptes == NULL) | |
94 | return -ENOMEM; | |
85ff6acb | 95 | |
162e3717 DV |
96 | area->area = alloc_vm_area(PAGE_SIZE * nr_frames, area->ptes); |
97 | if (area->area == NULL) { | |
98 | kfree(area->ptes); | |
99 | return -ENOMEM; | |
85ff6acb AL |
100 | } |
101 | ||
162e3717 | 102 | return 0; |
85ff6acb AL |
103 | } |
104 | ||
438b33c7 | 105 | int arch_gnttab_init(unsigned long nr_shared) |
162e3717 | 106 | { |
162e3717 DV |
107 | if (!xen_pv_domain()) |
108 | return 0; | |
109 | ||
438b33c7 | 110 | return arch_gnttab_valloc(&gnttab_shared_vm_area, nr_shared); |
8d3d2106 | 111 | } |
162e3717 | 112 | |
6926f6d6 KRW |
113 | #ifdef CONFIG_XEN_PVH |
114 | #include <xen/balloon.h> | |
115 | #include <xen/events.h> | |
116 | #include <linux/slab.h> | |
117 | static int __init xlated_setup_gnttab_pages(void) | |
118 | { | |
119 | struct page **pages; | |
120 | xen_pfn_t *pfns; | |
7d951f3c | 121 | void *vaddr; |
6926f6d6 KRW |
122 | int rc; |
123 | unsigned int i; | |
124 | unsigned long nr_grant_frames = gnttab_max_grant_frames(); | |
125 | ||
126 | BUG_ON(nr_grant_frames == 0); | |
127 | pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL); | |
128 | if (!pages) | |
129 | return -ENOMEM; | |
130 | ||
131 | pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL); | |
132 | if (!pfns) { | |
133 | kfree(pages); | |
134 | return -ENOMEM; | |
135 | } | |
81b286e0 | 136 | rc = alloc_xenballooned_pages(nr_grant_frames, pages); |
6926f6d6 KRW |
137 | if (rc) { |
138 | pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__, | |
139 | nr_grant_frames, rc); | |
140 | kfree(pages); | |
141 | kfree(pfns); | |
142 | return rc; | |
143 | } | |
144 | for (i = 0; i < nr_grant_frames; i++) | |
145 | pfns[i] = page_to_pfn(pages[i]); | |
146 | ||
7d951f3c DV |
147 | vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL); |
148 | if (!vaddr) { | |
6926f6d6 KRW |
149 | pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__, |
150 | nr_grant_frames, rc); | |
151 | free_xenballooned_pages(nr_grant_frames, pages); | |
f93576e1 | 152 | kfree(pages); |
6926f6d6 | 153 | kfree(pfns); |
7d951f3c | 154 | return -ENOMEM; |
6926f6d6 | 155 | } |
f93576e1 | 156 | kfree(pages); |
6926f6d6 KRW |
157 | |
158 | xen_auto_xlat_grant_frames.pfn = pfns; | |
159 | xen_auto_xlat_grant_frames.count = nr_grant_frames; | |
7d951f3c | 160 | xen_auto_xlat_grant_frames.vaddr = vaddr; |
6926f6d6 KRW |
161 | |
162 | return 0; | |
163 | } | |
164 | ||
165 | static int __init xen_pvh_gnttab_setup(void) | |
166 | { | |
167 | if (!xen_pvh_domain()) | |
168 | return -ENODEV; | |
169 | ||
170 | return xlated_setup_gnttab_pages(); | |
171 | } | |
172 | /* Call it _before_ __gnttab_init as we need to initialize the | |
173 | * xen_auto_xlat_grant_frames first. */ | |
174 | core_initcall(xen_pvh_gnttab_setup); | |
175 | #endif |