Commit | Line | Data |
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62c476c7 BAY |
1 | /* |
2 | * Copyright (c) 2006, Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Copyright (C) 2006-2008 Intel Corporation | |
18 | * Copyright IBM Corporation, 2008 | |
221d059d AK |
19 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
20 | * | |
62c476c7 BAY |
21 | * Author: Allen M. Kay <allen.m.kay@intel.com> |
22 | * Author: Weidong Han <weidong.han@intel.com> | |
23 | * Author: Ben-Ami Yassour <benami@il.ibm.com> | |
24 | */ | |
25 | ||
26 | #include <linux/list.h> | |
27 | #include <linux/kvm_host.h> | |
1767e931 | 28 | #include <linux/moduleparam.h> |
62c476c7 | 29 | #include <linux/pci.h> |
799fd8b2 | 30 | #include <linux/stat.h> |
19de40a8 | 31 | #include <linux/iommu.h> |
c9eab58f | 32 | #include "assigned-dev.h" |
62c476c7 | 33 | |
90ab5ee9 | 34 | static bool allow_unsafe_assigned_interrupts; |
3f68b031 AW |
35 | module_param_named(allow_unsafe_assigned_interrupts, |
36 | allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR); | |
37 | MODULE_PARM_DESC(allow_unsafe_assigned_interrupts, | |
38 | "Enable device assignment on platforms without interrupt remapping support."); | |
39 | ||
62c476c7 BAY |
40 | static int kvm_iommu_unmap_memslots(struct kvm *kvm); |
41 | static void kvm_iommu_put_pages(struct kvm *kvm, | |
42 | gfn_t base_gfn, unsigned long npages); | |
43 | ||
ba049e93 | 44 | static kvm_pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn, |
3d32e4db | 45 | unsigned long npages) |
fcd95807 JR |
46 | { |
47 | gfn_t end_gfn; | |
ba049e93 | 48 | kvm_pfn_t pfn; |
fcd95807 | 49 | |
d5661048 | 50 | pfn = gfn_to_pfn_memslot(slot, gfn); |
3d32e4db | 51 | end_gfn = gfn + npages; |
fcd95807 JR |
52 | gfn += 1; |
53 | ||
81c52c56 | 54 | if (is_error_noslot_pfn(pfn)) |
fcd95807 JR |
55 | return pfn; |
56 | ||
57 | while (gfn < end_gfn) | |
d5661048 | 58 | gfn_to_pfn_memslot(slot, gfn++); |
fcd95807 JR |
59 | |
60 | return pfn; | |
61 | } | |
62 | ||
ba049e93 DW |
63 | static void kvm_unpin_pages(struct kvm *kvm, kvm_pfn_t pfn, |
64 | unsigned long npages) | |
350b8bdd MT |
65 | { |
66 | unsigned long i; | |
67 | ||
68 | for (i = 0; i < npages; ++i) | |
69 | kvm_release_pfn_clean(pfn + i); | |
70 | } | |
71 | ||
3ad26d81 | 72 | int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot) |
62c476c7 | 73 | { |
fcd95807 | 74 | gfn_t gfn, end_gfn; |
ba049e93 | 75 | kvm_pfn_t pfn; |
fcd95807 | 76 | int r = 0; |
19de40a8 | 77 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
522c68c4 | 78 | int flags; |
62c476c7 BAY |
79 | |
80 | /* check if iommu exists and in use */ | |
81 | if (!domain) | |
82 | return 0; | |
83 | ||
fcd95807 JR |
84 | gfn = slot->base_gfn; |
85 | end_gfn = gfn + slot->npages; | |
86 | ||
d47510e2 AW |
87 | flags = IOMMU_READ; |
88 | if (!(slot->flags & KVM_MEM_READONLY)) | |
89 | flags |= IOMMU_WRITE; | |
d96eb2c6 | 90 | if (!kvm->arch.iommu_noncoherent) |
522c68c4 SY |
91 | flags |= IOMMU_CACHE; |
92 | ||
fcd95807 JR |
93 | |
94 | while (gfn < end_gfn) { | |
95 | unsigned long page_size; | |
96 | ||
97 | /* Check if already mapped */ | |
98 | if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) { | |
99 | gfn += 1; | |
100 | continue; | |
101 | } | |
102 | ||
103 | /* Get the page size we could use to map */ | |
104 | page_size = kvm_host_page_size(kvm, gfn); | |
105 | ||
106 | /* Make sure the page_size does not exceed the memslot */ | |
107 | while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn) | |
108 | page_size >>= 1; | |
109 | ||
110 | /* Make sure gfn is aligned to the page size we want to map */ | |
111 | while ((gfn << PAGE_SHIFT) & (page_size - 1)) | |
112 | page_size >>= 1; | |
113 | ||
27ef63c7 GE |
114 | /* Make sure hva is aligned to the page size we want to map */ |
115 | while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1)) | |
116 | page_size >>= 1; | |
117 | ||
fcd95807 JR |
118 | /* |
119 | * Pin all pages we are about to map in memory. This is | |
120 | * important because we unmap and unpin in 4kb steps later. | |
121 | */ | |
3d32e4db | 122 | pfn = kvm_pin_pages(slot, gfn, page_size >> PAGE_SHIFT); |
81c52c56 | 123 | if (is_error_noslot_pfn(pfn)) { |
fcd95807 | 124 | gfn += 1; |
62c476c7 | 125 | continue; |
fcd95807 | 126 | } |
62c476c7 | 127 | |
fcd95807 JR |
128 | /* Map into IO address space */ |
129 | r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn), | |
7d3002cc | 130 | page_size, flags); |
e5fcfc82 | 131 | if (r) { |
260782bc | 132 | printk(KERN_ERR "kvm_iommu_map_address:" |
5689cc53 | 133 | "iommu failed to map pfn=%llx\n", pfn); |
3d32e4db | 134 | kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT); |
62c476c7 BAY |
135 | goto unmap_pages; |
136 | } | |
fcd95807 JR |
137 | |
138 | gfn += page_size >> PAGE_SHIFT; | |
139 | ||
128ca093 | 140 | cond_resched(); |
62c476c7 | 141 | } |
fcd95807 | 142 | |
62c476c7 BAY |
143 | return 0; |
144 | ||
145 | unmap_pages: | |
350b8bdd | 146 | kvm_iommu_put_pages(kvm, slot->base_gfn, gfn - slot->base_gfn); |
62c476c7 BAY |
147 | return r; |
148 | } | |
149 | ||
150 | static int kvm_iommu_map_memslots(struct kvm *kvm) | |
151 | { | |
be6ba0f0 | 152 | int idx, r = 0; |
46a26bf5 | 153 | struct kvm_memslots *slots; |
be6ba0f0 | 154 | struct kvm_memory_slot *memslot; |
62c476c7 | 155 | |
e0f0bbc5 AW |
156 | if (kvm->arch.iommu_noncoherent) |
157 | kvm_arch_register_noncoherent_dma(kvm); | |
158 | ||
95c87e2b | 159 | idx = srcu_read_lock(&kvm->srcu); |
90d83dc3 | 160 | slots = kvm_memslots(kvm); |
46a26bf5 | 161 | |
be6ba0f0 XG |
162 | kvm_for_each_memslot(memslot, slots) { |
163 | r = kvm_iommu_map_pages(kvm, memslot); | |
62c476c7 BAY |
164 | if (r) |
165 | break; | |
166 | } | |
95c87e2b | 167 | srcu_read_unlock(&kvm->srcu, idx); |
682edb4c | 168 | |
62c476c7 BAY |
169 | return r; |
170 | } | |
171 | ||
c9eab58f | 172 | int kvm_assign_device(struct kvm *kvm, struct pci_dev *pdev) |
62c476c7 | 173 | { |
19de40a8 | 174 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
d96eb2c6 AW |
175 | int r; |
176 | bool noncoherent; | |
62c476c7 | 177 | |
260782bc WH |
178 | /* check if iommu exists and in use */ |
179 | if (!domain) | |
180 | return 0; | |
181 | ||
260782bc | 182 | if (pdev == NULL) |
62c476c7 | 183 | return -ENODEV; |
260782bc | 184 | |
19de40a8 | 185 | r = iommu_attach_device(domain, &pdev->dev); |
260782bc | 186 | if (r) { |
d151f63f | 187 | dev_err(&pdev->dev, "kvm assign device failed ret %d", r); |
260782bc | 188 | return r; |
62c476c7 BAY |
189 | } |
190 | ||
ee5ba30f | 191 | noncoherent = !iommu_capable(&pci_bus_type, IOMMU_CAP_CACHE_COHERENCY); |
522c68c4 SY |
192 | |
193 | /* Check if need to update IOMMU page table for guest memory */ | |
d96eb2c6 | 194 | if (noncoherent != kvm->arch.iommu_noncoherent) { |
522c68c4 | 195 | kvm_iommu_unmap_memslots(kvm); |
d96eb2c6 | 196 | kvm->arch.iommu_noncoherent = noncoherent; |
522c68c4 SY |
197 | r = kvm_iommu_map_memslots(kvm); |
198 | if (r) | |
199 | goto out_unmap; | |
200 | } | |
201 | ||
5544eb9b | 202 | kvm_arch_start_assignment(kvm); |
ad0d217c | 203 | pci_set_dev_assigned(pdev); |
6777829c | 204 | |
29242cb5 | 205 | dev_info(&pdev->dev, "kvm assign device\n"); |
62c476c7 | 206 | |
260782bc | 207 | return 0; |
522c68c4 SY |
208 | out_unmap: |
209 | kvm_iommu_unmap_memslots(kvm); | |
210 | return r; | |
260782bc | 211 | } |
62c476c7 | 212 | |
c9eab58f | 213 | int kvm_deassign_device(struct kvm *kvm, struct pci_dev *pdev) |
0a920356 | 214 | { |
19de40a8 | 215 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
0a920356 WH |
216 | |
217 | /* check if iommu exists and in use */ | |
218 | if (!domain) | |
219 | return 0; | |
220 | ||
0a920356 WH |
221 | if (pdev == NULL) |
222 | return -ENODEV; | |
223 | ||
19de40a8 | 224 | iommu_detach_device(domain, &pdev->dev); |
0a920356 | 225 | |
ad0d217c | 226 | pci_clear_dev_assigned(pdev); |
5544eb9b | 227 | kvm_arch_end_assignment(kvm); |
6777829c | 228 | |
29242cb5 | 229 | dev_info(&pdev->dev, "kvm deassign device\n"); |
0a920356 WH |
230 | |
231 | return 0; | |
232 | } | |
233 | ||
260782bc WH |
234 | int kvm_iommu_map_guest(struct kvm *kvm) |
235 | { | |
236 | int r; | |
237 | ||
a1b60c1c | 238 | if (!iommu_present(&pci_bus_type)) { |
19de40a8 | 239 | printk(KERN_ERR "%s: iommu not found\n", __func__); |
62c476c7 BAY |
240 | return -ENODEV; |
241 | } | |
242 | ||
21a1416a AW |
243 | mutex_lock(&kvm->slots_lock); |
244 | ||
905d66c1 | 245 | kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type); |
21a1416a AW |
246 | if (!kvm->arch.iommu_domain) { |
247 | r = -ENOMEM; | |
248 | goto out_unlock; | |
249 | } | |
62c476c7 | 250 | |
3f68b031 | 251 | if (!allow_unsafe_assigned_interrupts && |
ee5ba30f | 252 | !iommu_capable(&pci_bus_type, IOMMU_CAP_INTR_REMAP)) { |
3f68b031 AW |
253 | printk(KERN_WARNING "%s: No interrupt remapping support," |
254 | " disallowing device assignment." | |
c19ca6cb | 255 | " Re-enable with \"allow_unsafe_assigned_interrupts=1\"" |
3f68b031 AW |
256 | " module option.\n", __func__); |
257 | iommu_domain_free(kvm->arch.iommu_domain); | |
258 | kvm->arch.iommu_domain = NULL; | |
21a1416a AW |
259 | r = -EPERM; |
260 | goto out_unlock; | |
3f68b031 AW |
261 | } |
262 | ||
62c476c7 BAY |
263 | r = kvm_iommu_map_memslots(kvm); |
264 | if (r) | |
21a1416a | 265 | kvm_iommu_unmap_memslots(kvm); |
62c476c7 | 266 | |
21a1416a AW |
267 | out_unlock: |
268 | mutex_unlock(&kvm->slots_lock); | |
62c476c7 BAY |
269 | return r; |
270 | } | |
271 | ||
272 | static void kvm_iommu_put_pages(struct kvm *kvm, | |
260782bc | 273 | gfn_t base_gfn, unsigned long npages) |
62c476c7 | 274 | { |
fcd95807 JR |
275 | struct iommu_domain *domain; |
276 | gfn_t end_gfn, gfn; | |
ba049e93 | 277 | kvm_pfn_t pfn; |
260782bc WH |
278 | u64 phys; |
279 | ||
fcd95807 JR |
280 | domain = kvm->arch.iommu_domain; |
281 | end_gfn = base_gfn + npages; | |
282 | gfn = base_gfn; | |
283 | ||
260782bc WH |
284 | /* check if iommu exists and in use */ |
285 | if (!domain) | |
286 | return; | |
62c476c7 | 287 | |
fcd95807 JR |
288 | while (gfn < end_gfn) { |
289 | unsigned long unmap_pages; | |
7d3002cc | 290 | size_t size; |
fcd95807 JR |
291 | |
292 | /* Get physical address */ | |
19de40a8 | 293 | phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); |
16b854c8 XG |
294 | |
295 | if (!phys) { | |
296 | gfn++; | |
297 | continue; | |
298 | } | |
299 | ||
fcd95807 JR |
300 | pfn = phys >> PAGE_SHIFT; |
301 | ||
302 | /* Unmap address from IO address space */ | |
7d3002cc OBC |
303 | size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE); |
304 | unmap_pages = 1ULL << get_order(size); | |
260782bc | 305 | |
fcd95807 JR |
306 | /* Unpin all pages we just unmapped to not leak any memory */ |
307 | kvm_unpin_pages(kvm, pfn, unmap_pages); | |
308 | ||
309 | gfn += unmap_pages; | |
128ca093 JR |
310 | |
311 | cond_resched(); | |
fcd95807 | 312 | } |
62c476c7 BAY |
313 | } |
314 | ||
32f6daad AW |
315 | void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot) |
316 | { | |
317 | kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages); | |
318 | } | |
319 | ||
62c476c7 BAY |
320 | static int kvm_iommu_unmap_memslots(struct kvm *kvm) |
321 | { | |
be6ba0f0 | 322 | int idx; |
46a26bf5 | 323 | struct kvm_memslots *slots; |
be6ba0f0 | 324 | struct kvm_memory_slot *memslot; |
46a26bf5 | 325 | |
95c87e2b | 326 | idx = srcu_read_lock(&kvm->srcu); |
90d83dc3 | 327 | slots = kvm_memslots(kvm); |
682edb4c | 328 | |
be6ba0f0 | 329 | kvm_for_each_memslot(memslot, slots) |
32f6daad | 330 | kvm_iommu_unmap_pages(kvm, memslot); |
be6ba0f0 | 331 | |
95c87e2b | 332 | srcu_read_unlock(&kvm->srcu, idx); |
62c476c7 | 333 | |
e0f0bbc5 AW |
334 | if (kvm->arch.iommu_noncoherent) |
335 | kvm_arch_unregister_noncoherent_dma(kvm); | |
336 | ||
62c476c7 BAY |
337 | return 0; |
338 | } | |
339 | ||
340 | int kvm_iommu_unmap_guest(struct kvm *kvm) | |
341 | { | |
19de40a8 | 342 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
62c476c7 BAY |
343 | |
344 | /* check if iommu exists and in use */ | |
345 | if (!domain) | |
346 | return 0; | |
347 | ||
21a1416a | 348 | mutex_lock(&kvm->slots_lock); |
62c476c7 | 349 | kvm_iommu_unmap_memslots(kvm); |
21a1416a | 350 | kvm->arch.iommu_domain = NULL; |
d96eb2c6 | 351 | kvm->arch.iommu_noncoherent = false; |
21a1416a AW |
352 | mutex_unlock(&kvm->slots_lock); |
353 | ||
19de40a8 | 354 | iommu_domain_free(domain); |
62c476c7 BAY |
355 | return 0; |
356 | } |