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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> | |
28 | #include <linux/intel-iommu.h> | |
29 | ||
30 | static int kvm_iommu_unmap_memslots(struct kvm *kvm); | |
31 | static void kvm_iommu_put_pages(struct kvm *kvm, | |
32 | gfn_t base_gfn, unsigned long npages); | |
33 | ||
34 | int kvm_iommu_map_pages(struct kvm *kvm, | |
35 | gfn_t base_gfn, unsigned long npages) | |
36 | { | |
37 | gfn_t gfn = base_gfn; | |
38 | pfn_t pfn; | |
e5fcfc82 | 39 | int i, r = 0; |
62c476c7 BAY |
40 | struct dmar_domain *domain = kvm->arch.intel_iommu_domain; |
41 | ||
42 | /* check if iommu exists and in use */ | |
43 | if (!domain) | |
44 | return 0; | |
45 | ||
62c476c7 BAY |
46 | for (i = 0; i < npages; i++) { |
47 | /* check if already mapped */ | |
260782bc WH |
48 | if (intel_iommu_iova_to_phys(domain, |
49 | gfn_to_gpa(gfn))) | |
62c476c7 BAY |
50 | continue; |
51 | ||
52 | pfn = gfn_to_pfn(kvm, gfn); | |
260782bc WH |
53 | r = intel_iommu_map_address(domain, |
54 | gfn_to_gpa(gfn), | |
55 | pfn_to_hpa(pfn), | |
56 | PAGE_SIZE, | |
57 | DMA_PTE_READ | DMA_PTE_WRITE); | |
e5fcfc82 | 58 | if (r) { |
260782bc | 59 | printk(KERN_ERR "kvm_iommu_map_address:" |
e5fcfc82 | 60 | "iommu failed to map pfn=%lx\n", pfn); |
62c476c7 BAY |
61 | goto unmap_pages; |
62 | } | |
63 | gfn++; | |
64 | } | |
65 | return 0; | |
66 | ||
67 | unmap_pages: | |
68 | kvm_iommu_put_pages(kvm, base_gfn, i); | |
69 | return r; | |
70 | } | |
71 | ||
72 | static int kvm_iommu_map_memslots(struct kvm *kvm) | |
73 | { | |
74 | int i, r; | |
75 | ||
76 | down_read(&kvm->slots_lock); | |
77 | for (i = 0; i < kvm->nmemslots; i++) { | |
78 | r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn, | |
79 | kvm->memslots[i].npages); | |
80 | if (r) | |
81 | break; | |
82 | } | |
83 | up_read(&kvm->slots_lock); | |
84 | return r; | |
85 | } | |
86 | ||
260782bc WH |
87 | int kvm_assign_device(struct kvm *kvm, |
88 | struct kvm_assigned_dev_kernel *assigned_dev) | |
62c476c7 BAY |
89 | { |
90 | struct pci_dev *pdev = NULL; | |
260782bc | 91 | struct dmar_domain *domain = kvm->arch.intel_iommu_domain; |
62c476c7 BAY |
92 | int r; |
93 | ||
260782bc WH |
94 | /* check if iommu exists and in use */ |
95 | if (!domain) | |
96 | return 0; | |
97 | ||
98 | pdev = assigned_dev->dev; | |
99 | if (pdev == NULL) | |
62c476c7 | 100 | return -ENODEV; |
260782bc WH |
101 | |
102 | r = intel_iommu_attach_device(domain, pdev); | |
103 | if (r) { | |
104 | printk(KERN_ERR "assign device %x:%x.%x failed", | |
105 | pdev->bus->number, | |
106 | PCI_SLOT(pdev->devfn), | |
107 | PCI_FUNC(pdev->devfn)); | |
108 | return r; | |
62c476c7 BAY |
109 | } |
110 | ||
260782bc WH |
111 | printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n", |
112 | assigned_dev->host_busnr, | |
113 | PCI_SLOT(assigned_dev->host_devfn), | |
114 | PCI_FUNC(assigned_dev->host_devfn)); | |
62c476c7 | 115 | |
260782bc WH |
116 | return 0; |
117 | } | |
62c476c7 | 118 | |
0a920356 WH |
119 | int kvm_deassign_device(struct kvm *kvm, |
120 | struct kvm_assigned_dev_kernel *assigned_dev) | |
121 | { | |
122 | struct dmar_domain *domain = kvm->arch.intel_iommu_domain; | |
123 | struct pci_dev *pdev = NULL; | |
124 | ||
125 | /* check if iommu exists and in use */ | |
126 | if (!domain) | |
127 | return 0; | |
128 | ||
129 | pdev = assigned_dev->dev; | |
130 | if (pdev == NULL) | |
131 | return -ENODEV; | |
132 | ||
133 | intel_iommu_detach_device(domain, pdev); | |
134 | ||
135 | printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n", | |
136 | assigned_dev->host_busnr, | |
137 | PCI_SLOT(assigned_dev->host_devfn), | |
138 | PCI_FUNC(assigned_dev->host_devfn)); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
260782bc WH |
143 | int kvm_iommu_map_guest(struct kvm *kvm) |
144 | { | |
145 | int r; | |
146 | ||
147 | if (!intel_iommu_found()) { | |
148 | printk(KERN_ERR "%s: intel iommu not found\n", __func__); | |
62c476c7 BAY |
149 | return -ENODEV; |
150 | } | |
151 | ||
260782bc | 152 | kvm->arch.intel_iommu_domain = intel_iommu_alloc_domain(); |
62c476c7 | 153 | if (!kvm->arch.intel_iommu_domain) |
260782bc | 154 | return -ENOMEM; |
62c476c7 BAY |
155 | |
156 | r = kvm_iommu_map_memslots(kvm); | |
157 | if (r) | |
158 | goto out_unmap; | |
159 | ||
62c476c7 BAY |
160 | return 0; |
161 | ||
162 | out_unmap: | |
163 | kvm_iommu_unmap_memslots(kvm); | |
164 | return r; | |
165 | } | |
166 | ||
167 | static void kvm_iommu_put_pages(struct kvm *kvm, | |
260782bc | 168 | gfn_t base_gfn, unsigned long npages) |
62c476c7 BAY |
169 | { |
170 | gfn_t gfn = base_gfn; | |
171 | pfn_t pfn; | |
172 | struct dmar_domain *domain = kvm->arch.intel_iommu_domain; | |
260782bc WH |
173 | unsigned long i; |
174 | u64 phys; | |
175 | ||
176 | /* check if iommu exists and in use */ | |
177 | if (!domain) | |
178 | return; | |
62c476c7 BAY |
179 | |
180 | for (i = 0; i < npages; i++) { | |
260782bc WH |
181 | phys = intel_iommu_iova_to_phys(domain, |
182 | gfn_to_gpa(gfn)); | |
183 | pfn = phys >> PAGE_SHIFT; | |
62c476c7 BAY |
184 | kvm_release_pfn_clean(pfn); |
185 | gfn++; | |
186 | } | |
260782bc WH |
187 | |
188 | intel_iommu_unmap_address(domain, | |
189 | gfn_to_gpa(base_gfn), | |
190 | PAGE_SIZE * npages); | |
62c476c7 BAY |
191 | } |
192 | ||
193 | static int kvm_iommu_unmap_memslots(struct kvm *kvm) | |
194 | { | |
195 | int i; | |
196 | down_read(&kvm->slots_lock); | |
197 | for (i = 0; i < kvm->nmemslots; i++) { | |
198 | kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn, | |
199 | kvm->memslots[i].npages); | |
200 | } | |
201 | up_read(&kvm->slots_lock); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | int kvm_iommu_unmap_guest(struct kvm *kvm) | |
207 | { | |
208 | struct kvm_assigned_dev_kernel *entry; | |
209 | struct dmar_domain *domain = kvm->arch.intel_iommu_domain; | |
210 | ||
211 | /* check if iommu exists and in use */ | |
212 | if (!domain) | |
213 | return 0; | |
214 | ||
215 | list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) { | |
216 | printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n", | |
217 | entry->host_busnr, | |
218 | PCI_SLOT(entry->host_devfn), | |
219 | PCI_FUNC(entry->host_devfn)); | |
220 | ||
221 | /* detach kvm dmar domain */ | |
260782bc | 222 | intel_iommu_detach_device(domain, entry->dev); |
62c476c7 BAY |
223 | } |
224 | kvm_iommu_unmap_memslots(kvm); | |
260782bc | 225 | intel_iommu_free_domain(domain); |
62c476c7 BAY |
226 | return 0; |
227 | } |