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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 | |
19 | * Author: Allen M. Kay <allen.m.kay@intel.com> | |
20 | * Author: Weidong Han <weidong.han@intel.com> | |
21 | * Author: Ben-Ami Yassour <benami@il.ibm.com> | |
22 | */ | |
23 | ||
24 | #include <linux/list.h> | |
25 | #include <linux/kvm_host.h> | |
26 | #include <linux/pci.h> | |
27 | #include <linux/dmar.h> | |
19de40a8 | 28 | #include <linux/iommu.h> |
62c476c7 BAY |
29 | #include <linux/intel-iommu.h> |
30 | ||
31 | static int kvm_iommu_unmap_memslots(struct kvm *kvm); | |
32 | static void kvm_iommu_put_pages(struct kvm *kvm, | |
33 | gfn_t base_gfn, unsigned long npages); | |
34 | ||
35 | int kvm_iommu_map_pages(struct kvm *kvm, | |
36 | gfn_t base_gfn, unsigned long npages) | |
37 | { | |
38 | gfn_t gfn = base_gfn; | |
39 | pfn_t pfn; | |
e5fcfc82 | 40 | int i, r = 0; |
19de40a8 | 41 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
522c68c4 | 42 | int flags; |
62c476c7 BAY |
43 | |
44 | /* check if iommu exists and in use */ | |
45 | if (!domain) | |
46 | return 0; | |
47 | ||
522c68c4 SY |
48 | flags = IOMMU_READ | IOMMU_WRITE; |
49 | if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY) | |
50 | flags |= IOMMU_CACHE; | |
51 | ||
62c476c7 BAY |
52 | for (i = 0; i < npages; i++) { |
53 | /* check if already mapped */ | |
19de40a8 | 54 | if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) |
62c476c7 BAY |
55 | continue; |
56 | ||
57 | pfn = gfn_to_pfn(kvm, gfn); | |
19de40a8 JR |
58 | r = iommu_map_range(domain, |
59 | gfn_to_gpa(gfn), | |
60 | pfn_to_hpa(pfn), | |
522c68c4 | 61 | PAGE_SIZE, flags); |
e5fcfc82 | 62 | if (r) { |
260782bc | 63 | printk(KERN_ERR "kvm_iommu_map_address:" |
e5fcfc82 | 64 | "iommu failed to map pfn=%lx\n", pfn); |
62c476c7 BAY |
65 | goto unmap_pages; |
66 | } | |
67 | gfn++; | |
68 | } | |
69 | return 0; | |
70 | ||
71 | unmap_pages: | |
72 | kvm_iommu_put_pages(kvm, base_gfn, i); | |
73 | return r; | |
74 | } | |
75 | ||
76 | static int kvm_iommu_map_memslots(struct kvm *kvm) | |
77 | { | |
7398ca79 | 78 | int i, r = 0; |
62c476c7 | 79 | |
62c476c7 BAY |
80 | for (i = 0; i < kvm->nmemslots; i++) { |
81 | r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn, | |
82 | kvm->memslots[i].npages); | |
83 | if (r) | |
84 | break; | |
85 | } | |
682edb4c | 86 | |
62c476c7 BAY |
87 | return r; |
88 | } | |
89 | ||
260782bc WH |
90 | int kvm_assign_device(struct kvm *kvm, |
91 | struct kvm_assigned_dev_kernel *assigned_dev) | |
62c476c7 BAY |
92 | { |
93 | struct pci_dev *pdev = NULL; | |
19de40a8 | 94 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
522c68c4 | 95 | int r, last_flags; |
62c476c7 | 96 | |
260782bc WH |
97 | /* check if iommu exists and in use */ |
98 | if (!domain) | |
99 | return 0; | |
100 | ||
101 | pdev = assigned_dev->dev; | |
102 | if (pdev == NULL) | |
62c476c7 | 103 | return -ENODEV; |
260782bc | 104 | |
19de40a8 | 105 | r = iommu_attach_device(domain, &pdev->dev); |
260782bc WH |
106 | if (r) { |
107 | printk(KERN_ERR "assign device %x:%x.%x failed", | |
108 | pdev->bus->number, | |
109 | PCI_SLOT(pdev->devfn), | |
110 | PCI_FUNC(pdev->devfn)); | |
111 | return r; | |
62c476c7 BAY |
112 | } |
113 | ||
522c68c4 SY |
114 | last_flags = kvm->arch.iommu_flags; |
115 | if (iommu_domain_has_cap(kvm->arch.iommu_domain, | |
116 | IOMMU_CAP_CACHE_COHERENCY)) | |
117 | kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY; | |
118 | ||
119 | /* Check if need to update IOMMU page table for guest memory */ | |
120 | if ((last_flags ^ kvm->arch.iommu_flags) == | |
121 | KVM_IOMMU_CACHE_COHERENCY) { | |
122 | kvm_iommu_unmap_memslots(kvm); | |
123 | r = kvm_iommu_map_memslots(kvm); | |
124 | if (r) | |
125 | goto out_unmap; | |
126 | } | |
127 | ||
260782bc WH |
128 | printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n", |
129 | assigned_dev->host_busnr, | |
130 | PCI_SLOT(assigned_dev->host_devfn), | |
131 | PCI_FUNC(assigned_dev->host_devfn)); | |
62c476c7 | 132 | |
260782bc | 133 | return 0; |
522c68c4 SY |
134 | out_unmap: |
135 | kvm_iommu_unmap_memslots(kvm); | |
136 | return r; | |
260782bc | 137 | } |
62c476c7 | 138 | |
0a920356 WH |
139 | int kvm_deassign_device(struct kvm *kvm, |
140 | struct kvm_assigned_dev_kernel *assigned_dev) | |
141 | { | |
19de40a8 | 142 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
0a920356 WH |
143 | struct pci_dev *pdev = NULL; |
144 | ||
145 | /* check if iommu exists and in use */ | |
146 | if (!domain) | |
147 | return 0; | |
148 | ||
149 | pdev = assigned_dev->dev; | |
150 | if (pdev == NULL) | |
151 | return -ENODEV; | |
152 | ||
19de40a8 | 153 | iommu_detach_device(domain, &pdev->dev); |
0a920356 WH |
154 | |
155 | printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n", | |
156 | assigned_dev->host_busnr, | |
157 | PCI_SLOT(assigned_dev->host_devfn), | |
158 | PCI_FUNC(assigned_dev->host_devfn)); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
260782bc WH |
163 | int kvm_iommu_map_guest(struct kvm *kvm) |
164 | { | |
165 | int r; | |
166 | ||
19de40a8 JR |
167 | if (!iommu_found()) { |
168 | printk(KERN_ERR "%s: iommu not found\n", __func__); | |
62c476c7 BAY |
169 | return -ENODEV; |
170 | } | |
171 | ||
19de40a8 JR |
172 | kvm->arch.iommu_domain = iommu_domain_alloc(); |
173 | if (!kvm->arch.iommu_domain) | |
260782bc | 174 | return -ENOMEM; |
62c476c7 BAY |
175 | |
176 | r = kvm_iommu_map_memslots(kvm); | |
177 | if (r) | |
178 | goto out_unmap; | |
179 | ||
62c476c7 BAY |
180 | return 0; |
181 | ||
182 | out_unmap: | |
183 | kvm_iommu_unmap_memslots(kvm); | |
184 | return r; | |
185 | } | |
186 | ||
187 | static void kvm_iommu_put_pages(struct kvm *kvm, | |
260782bc | 188 | gfn_t base_gfn, unsigned long npages) |
62c476c7 BAY |
189 | { |
190 | gfn_t gfn = base_gfn; | |
191 | pfn_t pfn; | |
19de40a8 | 192 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
260782bc WH |
193 | unsigned long i; |
194 | u64 phys; | |
195 | ||
196 | /* check if iommu exists and in use */ | |
197 | if (!domain) | |
198 | return; | |
62c476c7 BAY |
199 | |
200 | for (i = 0; i < npages; i++) { | |
19de40a8 | 201 | phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); |
260782bc | 202 | pfn = phys >> PAGE_SHIFT; |
62c476c7 BAY |
203 | kvm_release_pfn_clean(pfn); |
204 | gfn++; | |
205 | } | |
260782bc | 206 | |
19de40a8 | 207 | iommu_unmap_range(domain, gfn_to_gpa(base_gfn), PAGE_SIZE * npages); |
62c476c7 BAY |
208 | } |
209 | ||
210 | static int kvm_iommu_unmap_memslots(struct kvm *kvm) | |
211 | { | |
212 | int i; | |
682edb4c | 213 | |
62c476c7 BAY |
214 | for (i = 0; i < kvm->nmemslots; i++) { |
215 | kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn, | |
216 | kvm->memslots[i].npages); | |
217 | } | |
62c476c7 BAY |
218 | |
219 | return 0; | |
220 | } | |
221 | ||
222 | int kvm_iommu_unmap_guest(struct kvm *kvm) | |
223 | { | |
19de40a8 | 224 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
62c476c7 BAY |
225 | |
226 | /* check if iommu exists and in use */ | |
227 | if (!domain) | |
228 | return 0; | |
229 | ||
62c476c7 | 230 | kvm_iommu_unmap_memslots(kvm); |
19de40a8 | 231 | iommu_domain_free(domain); |
62c476c7 BAY |
232 | return 0; |
233 | } |