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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> | |
51441d43 | 28 | #include <linux/module.h> |
62c476c7 | 29 | #include <linux/pci.h> |
799fd8b2 | 30 | #include <linux/stat.h> |
62c476c7 | 31 | #include <linux/dmar.h> |
19de40a8 | 32 | #include <linux/iommu.h> |
62c476c7 BAY |
33 | #include <linux/intel-iommu.h> |
34 | ||
90ab5ee9 | 35 | static bool allow_unsafe_assigned_interrupts; |
3f68b031 AW |
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 | ||
62c476c7 BAY |
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 | ||
fcd95807 JR |
45 | static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot, |
46 | gfn_t gfn, unsigned long size) | |
47 | { | |
48 | gfn_t end_gfn; | |
49 | pfn_t pfn; | |
50 | ||
51 | pfn = gfn_to_pfn_memslot(kvm, slot, gfn); | |
52 | end_gfn = gfn + (size >> PAGE_SHIFT); | |
53 | gfn += 1; | |
54 | ||
55 | if (is_error_pfn(pfn)) | |
56 | return pfn; | |
57 | ||
58 | while (gfn < end_gfn) | |
59 | gfn_to_pfn_memslot(kvm, slot, gfn++); | |
60 | ||
61 | return pfn; | |
62 | } | |
63 | ||
3ad26d81 | 64 | int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot) |
62c476c7 | 65 | { |
fcd95807 | 66 | gfn_t gfn, end_gfn; |
62c476c7 | 67 | pfn_t pfn; |
fcd95807 | 68 | int r = 0; |
19de40a8 | 69 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
522c68c4 | 70 | int flags; |
62c476c7 BAY |
71 | |
72 | /* check if iommu exists and in use */ | |
73 | if (!domain) | |
74 | return 0; | |
75 | ||
fcd95807 JR |
76 | gfn = slot->base_gfn; |
77 | end_gfn = gfn + slot->npages; | |
78 | ||
522c68c4 SY |
79 | flags = IOMMU_READ | IOMMU_WRITE; |
80 | if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY) | |
81 | flags |= IOMMU_CACHE; | |
82 | ||
fcd95807 JR |
83 | |
84 | while (gfn < end_gfn) { | |
85 | unsigned long page_size; | |
86 | ||
87 | /* Check if already mapped */ | |
88 | if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) { | |
89 | gfn += 1; | |
90 | continue; | |
91 | } | |
92 | ||
93 | /* Get the page size we could use to map */ | |
94 | page_size = kvm_host_page_size(kvm, gfn); | |
95 | ||
96 | /* Make sure the page_size does not exceed the memslot */ | |
97 | while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn) | |
98 | page_size >>= 1; | |
99 | ||
100 | /* Make sure gfn is aligned to the page size we want to map */ | |
101 | while ((gfn << PAGE_SHIFT) & (page_size - 1)) | |
102 | page_size >>= 1; | |
103 | ||
104 | /* | |
105 | * Pin all pages we are about to map in memory. This is | |
106 | * important because we unmap and unpin in 4kb steps later. | |
107 | */ | |
108 | pfn = kvm_pin_pages(kvm, slot, gfn, page_size); | |
109 | if (is_error_pfn(pfn)) { | |
110 | gfn += 1; | |
62c476c7 | 111 | continue; |
fcd95807 | 112 | } |
62c476c7 | 113 | |
fcd95807 JR |
114 | /* Map into IO address space */ |
115 | r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn), | |
7d3002cc | 116 | page_size, flags); |
e5fcfc82 | 117 | if (r) { |
260782bc | 118 | printk(KERN_ERR "kvm_iommu_map_address:" |
5689cc53 | 119 | "iommu failed to map pfn=%llx\n", pfn); |
62c476c7 BAY |
120 | goto unmap_pages; |
121 | } | |
fcd95807 JR |
122 | |
123 | gfn += page_size >> PAGE_SHIFT; | |
124 | ||
125 | ||
62c476c7 | 126 | } |
fcd95807 | 127 | |
62c476c7 BAY |
128 | return 0; |
129 | ||
130 | unmap_pages: | |
fcd95807 | 131 | kvm_iommu_put_pages(kvm, slot->base_gfn, gfn); |
62c476c7 BAY |
132 | return r; |
133 | } | |
134 | ||
135 | static int kvm_iommu_map_memslots(struct kvm *kvm) | |
136 | { | |
be6ba0f0 | 137 | int idx, r = 0; |
46a26bf5 | 138 | struct kvm_memslots *slots; |
be6ba0f0 | 139 | struct kvm_memory_slot *memslot; |
62c476c7 | 140 | |
95c87e2b | 141 | idx = srcu_read_lock(&kvm->srcu); |
90d83dc3 | 142 | slots = kvm_memslots(kvm); |
46a26bf5 | 143 | |
be6ba0f0 XG |
144 | kvm_for_each_memslot(memslot, slots) { |
145 | r = kvm_iommu_map_pages(kvm, memslot); | |
62c476c7 BAY |
146 | if (r) |
147 | break; | |
148 | } | |
95c87e2b | 149 | srcu_read_unlock(&kvm->srcu, idx); |
682edb4c | 150 | |
62c476c7 BAY |
151 | return r; |
152 | } | |
153 | ||
260782bc WH |
154 | int kvm_assign_device(struct kvm *kvm, |
155 | struct kvm_assigned_dev_kernel *assigned_dev) | |
62c476c7 BAY |
156 | { |
157 | struct pci_dev *pdev = NULL; | |
19de40a8 | 158 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
522c68c4 | 159 | int r, last_flags; |
62c476c7 | 160 | |
260782bc WH |
161 | /* check if iommu exists and in use */ |
162 | if (!domain) | |
163 | return 0; | |
164 | ||
165 | pdev = assigned_dev->dev; | |
166 | if (pdev == NULL) | |
62c476c7 | 167 | return -ENODEV; |
260782bc | 168 | |
19de40a8 | 169 | r = iommu_attach_device(domain, &pdev->dev); |
260782bc | 170 | if (r) { |
ab9f4ecb ZE |
171 | printk(KERN_ERR "assign device %x:%x:%x.%x failed", |
172 | pci_domain_nr(pdev->bus), | |
260782bc WH |
173 | pdev->bus->number, |
174 | PCI_SLOT(pdev->devfn), | |
175 | PCI_FUNC(pdev->devfn)); | |
176 | return r; | |
62c476c7 BAY |
177 | } |
178 | ||
522c68c4 SY |
179 | last_flags = kvm->arch.iommu_flags; |
180 | if (iommu_domain_has_cap(kvm->arch.iommu_domain, | |
181 | IOMMU_CAP_CACHE_COHERENCY)) | |
182 | kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY; | |
183 | ||
184 | /* Check if need to update IOMMU page table for guest memory */ | |
185 | if ((last_flags ^ kvm->arch.iommu_flags) == | |
186 | KVM_IOMMU_CACHE_COHERENCY) { | |
187 | kvm_iommu_unmap_memslots(kvm); | |
188 | r = kvm_iommu_map_memslots(kvm); | |
189 | if (r) | |
190 | goto out_unmap; | |
191 | } | |
192 | ||
6777829c GR |
193 | pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED; |
194 | ||
ab9f4ecb ZE |
195 | printk(KERN_DEBUG "assign device %x:%x:%x.%x\n", |
196 | assigned_dev->host_segnr, | |
260782bc WH |
197 | assigned_dev->host_busnr, |
198 | PCI_SLOT(assigned_dev->host_devfn), | |
199 | PCI_FUNC(assigned_dev->host_devfn)); | |
62c476c7 | 200 | |
260782bc | 201 | return 0; |
522c68c4 SY |
202 | out_unmap: |
203 | kvm_iommu_unmap_memslots(kvm); | |
204 | return r; | |
260782bc | 205 | } |
62c476c7 | 206 | |
0a920356 WH |
207 | int kvm_deassign_device(struct kvm *kvm, |
208 | struct kvm_assigned_dev_kernel *assigned_dev) | |
209 | { | |
19de40a8 | 210 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
0a920356 WH |
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 | ||
19de40a8 | 221 | iommu_detach_device(domain, &pdev->dev); |
0a920356 | 222 | |
6777829c GR |
223 | pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; |
224 | ||
ab9f4ecb ZE |
225 | printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n", |
226 | assigned_dev->host_segnr, | |
0a920356 WH |
227 | assigned_dev->host_busnr, |
228 | PCI_SLOT(assigned_dev->host_devfn), | |
229 | PCI_FUNC(assigned_dev->host_devfn)); | |
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 | ||
905d66c1 | 243 | kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type); |
19de40a8 | 244 | if (!kvm->arch.iommu_domain) |
260782bc | 245 | return -ENOMEM; |
62c476c7 | 246 | |
3f68b031 AW |
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 | return -EPERM; | |
257 | } | |
258 | ||
62c476c7 BAY |
259 | r = kvm_iommu_map_memslots(kvm); |
260 | if (r) | |
261 | goto out_unmap; | |
262 | ||
62c476c7 BAY |
263 | return 0; |
264 | ||
265 | out_unmap: | |
266 | kvm_iommu_unmap_memslots(kvm); | |
267 | return r; | |
268 | } | |
269 | ||
fcd95807 JR |
270 | static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages) |
271 | { | |
272 | unsigned long i; | |
273 | ||
274 | for (i = 0; i < npages; ++i) | |
275 | kvm_release_pfn_clean(pfn + i); | |
276 | } | |
277 | ||
62c476c7 | 278 | static void kvm_iommu_put_pages(struct kvm *kvm, |
260782bc | 279 | gfn_t base_gfn, unsigned long npages) |
62c476c7 | 280 | { |
fcd95807 JR |
281 | struct iommu_domain *domain; |
282 | gfn_t end_gfn, gfn; | |
62c476c7 | 283 | pfn_t pfn; |
260782bc WH |
284 | u64 phys; |
285 | ||
fcd95807 JR |
286 | domain = kvm->arch.iommu_domain; |
287 | end_gfn = base_gfn + npages; | |
288 | gfn = base_gfn; | |
289 | ||
260782bc WH |
290 | /* check if iommu exists and in use */ |
291 | if (!domain) | |
292 | return; | |
62c476c7 | 293 | |
fcd95807 JR |
294 | while (gfn < end_gfn) { |
295 | unsigned long unmap_pages; | |
7d3002cc | 296 | size_t size; |
fcd95807 JR |
297 | |
298 | /* Get physical address */ | |
19de40a8 | 299 | phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); |
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; | |
310 | } | |
62c476c7 BAY |
311 | } |
312 | ||
313 | static int kvm_iommu_unmap_memslots(struct kvm *kvm) | |
314 | { | |
be6ba0f0 | 315 | int idx; |
46a26bf5 | 316 | struct kvm_memslots *slots; |
be6ba0f0 | 317 | struct kvm_memory_slot *memslot; |
46a26bf5 | 318 | |
95c87e2b | 319 | idx = srcu_read_lock(&kvm->srcu); |
90d83dc3 | 320 | slots = kvm_memslots(kvm); |
682edb4c | 321 | |
be6ba0f0 XG |
322 | kvm_for_each_memslot(memslot, slots) |
323 | kvm_iommu_put_pages(kvm, memslot->base_gfn, memslot->npages); | |
324 | ||
95c87e2b | 325 | srcu_read_unlock(&kvm->srcu, idx); |
62c476c7 BAY |
326 | |
327 | return 0; | |
328 | } | |
329 | ||
330 | int kvm_iommu_unmap_guest(struct kvm *kvm) | |
331 | { | |
19de40a8 | 332 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
62c476c7 BAY |
333 | |
334 | /* check if iommu exists and in use */ | |
335 | if (!domain) | |
336 | return 0; | |
337 | ||
62c476c7 | 338 | kvm_iommu_unmap_memslots(kvm); |
19de40a8 | 339 | iommu_domain_free(domain); |
62c476c7 BAY |
340 | return 0; |
341 | } |