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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 |
19 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
20 | * |
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> |
28 | #include <linux/module.h> |
29 | #include <linux/pci.h> |
30 | #include <linux/stat.h> |
31 | #include <linux/dmar.h> |
32 | #include <linux/iommu.h> |
33 | #include <linux/intel-iommu.h> |
34 | |
35 | static bool allow_unsafe_assigned_interrupts; |
36 | module_param_named(allow_unsafe_assigned_interrupts, |
37 | allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR); |
38 | MODULE_PARM_DESC(allow_unsafe_assigned_interrupts, |
39 | "Enable device assignment on platforms without interrupt remapping support."); |
40 | |
41 | static int kvm_iommu_unmap_memslots(struct kvm *kvm); |
42 | static void kvm_iommu_put_pages(struct kvm *kvm, |
43 | gfn_t base_gfn, unsigned long npages); |
44 | |
45 | static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn, |
46 | unsigned long size) |
47 | { |
48 | gfn_t end_gfn; |
49 | pfn_t pfn; |
50 | |
51 | pfn = gfn_to_pfn_memslot(slot, gfn); |
52 | end_gfn = gfn + (size >> PAGE_SHIFT); |
53 | gfn += 1; |
54 | |
55 | if (is_error_noslot_pfn(pfn)) |
56 | return pfn; |
57 | |
58 | while (gfn < end_gfn) |
59 | gfn_to_pfn_memslot(slot, gfn++); |
60 | |
61 | return pfn; |
62 | } |
63 | |
64 | int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot) |
65 | { |
66 | gfn_t gfn, end_gfn; |
67 | pfn_t pfn; |
68 | int r = 0; |
69 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
70 | int flags; |
71 | |
72 | /* check if iommu exists and in use */ |
73 | if (!domain) |
74 | return 0; |
75 | |
76 | gfn = slot->base_gfn; |
77 | end_gfn = gfn + slot->npages; |
78 | |
79 | flags = IOMMU_READ; |
80 | if (!(slot->flags & KVM_MEM_READONLY)) |
81 | flags |= IOMMU_WRITE; |
82 | if (!kvm->arch.iommu_noncoherent) |
83 | flags |= IOMMU_CACHE; |
84 | |
85 | |
86 | while (gfn < end_gfn) { |
87 | unsigned long page_size; |
88 | |
89 | /* Check if already mapped */ |
90 | if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) { |
91 | gfn += 1; |
92 | continue; |
93 | } |
94 | |
95 | /* Get the page size we could use to map */ |
96 | page_size = kvm_host_page_size(kvm, gfn); |
97 | |
98 | /* Make sure the page_size does not exceed the memslot */ |
99 | while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn) |
100 | page_size >>= 1; |
101 | |
102 | /* Make sure gfn is aligned to the page size we want to map */ |
103 | while ((gfn << PAGE_SHIFT) & (page_size - 1)) |
104 | page_size >>= 1; |
105 | |
106 | /* Make sure hva is aligned to the page size we want to map */ |
107 | while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1)) |
108 | page_size >>= 1; |
109 | |
110 | /* |
111 | * Pin all pages we are about to map in memory. This is |
112 | * important because we unmap and unpin in 4kb steps later. |
113 | */ |
114 | pfn = kvm_pin_pages(slot, gfn, page_size); |
115 | if (is_error_noslot_pfn(pfn)) { |
116 | gfn += 1; |
117 | continue; |
118 | } |
119 | |
120 | /* Map into IO address space */ |
121 | r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn), |
122 | page_size, flags); |
123 | if (r) { |
124 | printk(KERN_ERR "kvm_iommu_map_address:" |
125 | "iommu failed to map pfn=%llx\n", pfn); |
126 | goto unmap_pages; |
127 | } |
128 | |
129 | gfn += page_size >> PAGE_SHIFT; |
130 | |
131 | |
132 | } |
133 | |
134 | return 0; |
135 | |
136 | unmap_pages: |
137 | kvm_iommu_put_pages(kvm, slot->base_gfn, gfn); |
138 | return r; |
139 | } |
140 | |
141 | static int kvm_iommu_map_memslots(struct kvm *kvm) |
142 | { |
143 | int idx, r = 0; |
144 | struct kvm_memslots *slots; |
145 | struct kvm_memory_slot *memslot; |
146 | |
147 | if (kvm->arch.iommu_noncoherent) |
148 | kvm_arch_register_noncoherent_dma(kvm); |
149 | |
150 | idx = srcu_read_lock(&kvm->srcu); |
151 | slots = kvm_memslots(kvm); |
152 | |
153 | kvm_for_each_memslot(memslot, slots) { |
154 | r = kvm_iommu_map_pages(kvm, memslot); |
155 | if (r) |
156 | break; |
157 | } |
158 | srcu_read_unlock(&kvm->srcu, idx); |
159 | |
160 | return r; |
161 | } |
162 | |
163 | int kvm_assign_device(struct kvm *kvm, |
164 | struct kvm_assigned_dev_kernel *assigned_dev) |
165 | { |
166 | struct pci_dev *pdev = NULL; |
167 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
168 | int r; |
169 | bool noncoherent; |
170 | |
171 | /* check if iommu exists and in use */ |
172 | if (!domain) |
173 | return 0; |
174 | |
175 | pdev = assigned_dev->dev; |
176 | if (pdev == NULL) |
177 | return -ENODEV; |
178 | |
179 | r = iommu_attach_device(domain, &pdev->dev); |
180 | if (r) { |
181 | dev_err(&pdev->dev, "kvm assign device failed ret %d", r); |
182 | return r; |
183 | } |
184 | |
185 | noncoherent = !iommu_domain_has_cap(kvm->arch.iommu_domain, |
186 | IOMMU_CAP_CACHE_COHERENCY); |
187 | |
188 | /* Check if need to update IOMMU page table for guest memory */ |
189 | if (noncoherent != kvm->arch.iommu_noncoherent) { |
190 | kvm_iommu_unmap_memslots(kvm); |
191 | kvm->arch.iommu_noncoherent = noncoherent; |
192 | r = kvm_iommu_map_memslots(kvm); |
193 | if (r) |
194 | goto out_unmap; |
195 | } |
196 | |
197 | pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED; |
198 | |
199 | dev_info(&pdev->dev, "kvm assign device\n"); |
200 | |
201 | return 0; |
202 | out_unmap: |
203 | kvm_iommu_unmap_memslots(kvm); |
204 | return r; |
205 | } |
206 | |
207 | int kvm_deassign_device(struct kvm *kvm, |
208 | struct kvm_assigned_dev_kernel *assigned_dev) |
209 | { |
210 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
211 | struct pci_dev *pdev = NULL; |
212 | |
213 | /* check if iommu exists and in use */ |
214 | if (!domain) |
215 | return 0; |
216 | |
217 | pdev = assigned_dev->dev; |
218 | if (pdev == NULL) |
219 | return -ENODEV; |
220 | |
221 | iommu_detach_device(domain, &pdev->dev); |
222 | |
223 | pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; |
224 | |
225 | dev_info(&pdev->dev, "kvm deassign device\n"); |
226 | |
227 | return 0; |
228 | } |
229 | |
230 | int kvm_iommu_map_guest(struct kvm *kvm) |
231 | { |
232 | int r; |
233 | |
234 | if (!iommu_present(&pci_bus_type)) { |
235 | printk(KERN_ERR "%s: iommu not found\n", __func__); |
236 | return -ENODEV; |
237 | } |
238 | |
239 | mutex_lock(&kvm->slots_lock); |
240 | |
241 | kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type); |
242 | if (!kvm->arch.iommu_domain) { |
243 | r = -ENOMEM; |
244 | goto out_unlock; |
245 | } |
246 | |
247 | if (!allow_unsafe_assigned_interrupts && |
248 | !iommu_domain_has_cap(kvm->arch.iommu_domain, |
249 | IOMMU_CAP_INTR_REMAP)) { |
250 | printk(KERN_WARNING "%s: No interrupt remapping support," |
251 | " disallowing device assignment." |
252 | " Re-enble with \"allow_unsafe_assigned_interrupts=1\"" |
253 | " module option.\n", __func__); |
254 | iommu_domain_free(kvm->arch.iommu_domain); |
255 | kvm->arch.iommu_domain = NULL; |
256 | r = -EPERM; |
257 | goto out_unlock; |
258 | } |
259 | |
260 | r = kvm_iommu_map_memslots(kvm); |
261 | if (r) |
262 | kvm_iommu_unmap_memslots(kvm); |
263 | |
264 | out_unlock: |
265 | mutex_unlock(&kvm->slots_lock); |
266 | return r; |
267 | } |
268 | |
269 | static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages) |
270 | { |
271 | unsigned long i; |
272 | |
273 | for (i = 0; i < npages; ++i) |
274 | kvm_release_pfn_clean(pfn + i); |
275 | } |
276 | |
277 | static void kvm_iommu_put_pages(struct kvm *kvm, |
278 | gfn_t base_gfn, unsigned long npages) |
279 | { |
280 | struct iommu_domain *domain; |
281 | gfn_t end_gfn, gfn; |
282 | pfn_t pfn; |
283 | u64 phys; |
284 | |
285 | domain = kvm->arch.iommu_domain; |
286 | end_gfn = base_gfn + npages; |
287 | gfn = base_gfn; |
288 | |
289 | /* check if iommu exists and in use */ |
290 | if (!domain) |
291 | return; |
292 | |
293 | while (gfn < end_gfn) { |
294 | unsigned long unmap_pages; |
295 | size_t size; |
296 | |
297 | /* Get physical address */ |
298 | phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); |
299 | |
300 | if (!phys) { |
301 | gfn++; |
302 | continue; |
303 | } |
304 | |
305 | pfn = phys >> PAGE_SHIFT; |
306 | |
307 | /* Unmap address from IO address space */ |
308 | size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE); |
309 | unmap_pages = 1ULL << get_order(size); |
310 | |
311 | /* Unpin all pages we just unmapped to not leak any memory */ |
312 | kvm_unpin_pages(kvm, pfn, unmap_pages); |
313 | |
314 | gfn += unmap_pages; |
315 | } |
316 | } |
317 | |
318 | void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot) |
319 | { |
320 | kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages); |
321 | } |
322 | |
323 | static int kvm_iommu_unmap_memslots(struct kvm *kvm) |
324 | { |
325 | int idx; |
326 | struct kvm_memslots *slots; |
327 | struct kvm_memory_slot *memslot; |
328 | |
329 | idx = srcu_read_lock(&kvm->srcu); |
330 | slots = kvm_memslots(kvm); |
331 | |
332 | kvm_for_each_memslot(memslot, slots) |
333 | kvm_iommu_unmap_pages(kvm, memslot); |
334 | |
335 | srcu_read_unlock(&kvm->srcu, idx); |
336 | |
337 | if (kvm->arch.iommu_noncoherent) |
338 | kvm_arch_unregister_noncoherent_dma(kvm); |
339 | |
340 | return 0; |
341 | } |
342 | |
343 | int kvm_iommu_unmap_guest(struct kvm *kvm) |
344 | { |
345 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
346 | |
347 | /* check if iommu exists and in use */ |
348 | if (!domain) |
349 | return 0; |
350 | |
351 | mutex_lock(&kvm->slots_lock); |
352 | kvm_iommu_unmap_memslots(kvm); |
353 | kvm->arch.iommu_domain = NULL; |
354 | kvm->arch.iommu_noncoherent = false; |
355 | mutex_unlock(&kvm->slots_lock); |
356 | |
357 | iommu_domain_free(domain); |
358 | return 0; |
359 | } |
360 |
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