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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; |
62c476c7 BAY |
42 | |
43 | /* check if iommu exists and in use */ | |
44 | if (!domain) | |
45 | return 0; | |
46 | ||
62c476c7 BAY |
47 | for (i = 0; i < npages; i++) { |
48 | /* check if already mapped */ | |
19de40a8 | 49 | if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) |
62c476c7 BAY |
50 | continue; |
51 | ||
52 | pfn = gfn_to_pfn(kvm, gfn); | |
19de40a8 JR |
53 | r = iommu_map_range(domain, |
54 | gfn_to_gpa(gfn), | |
55 | pfn_to_hpa(pfn), | |
56 | PAGE_SIZE, | |
57 | IOMMU_READ | IOMMU_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 | { | |
7398ca79 | 74 | int i, r = 0; |
62c476c7 | 75 | |
62c476c7 BAY |
76 | for (i = 0; i < kvm->nmemslots; i++) { |
77 | r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn, | |
78 | kvm->memslots[i].npages); | |
79 | if (r) | |
80 | break; | |
81 | } | |
682edb4c | 82 | |
62c476c7 BAY |
83 | return r; |
84 | } | |
85 | ||
260782bc WH |
86 | int kvm_assign_device(struct kvm *kvm, |
87 | struct kvm_assigned_dev_kernel *assigned_dev) | |
62c476c7 BAY |
88 | { |
89 | struct pci_dev *pdev = NULL; | |
19de40a8 | 90 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
62c476c7 BAY |
91 | int r; |
92 | ||
260782bc WH |
93 | /* check if iommu exists and in use */ |
94 | if (!domain) | |
95 | return 0; | |
96 | ||
97 | pdev = assigned_dev->dev; | |
98 | if (pdev == NULL) | |
62c476c7 | 99 | return -ENODEV; |
260782bc | 100 | |
19de40a8 | 101 | r = iommu_attach_device(domain, &pdev->dev); |
260782bc WH |
102 | if (r) { |
103 | printk(KERN_ERR "assign device %x:%x.%x failed", | |
104 | pdev->bus->number, | |
105 | PCI_SLOT(pdev->devfn), | |
106 | PCI_FUNC(pdev->devfn)); | |
107 | return r; | |
62c476c7 BAY |
108 | } |
109 | ||
260782bc WH |
110 | printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n", |
111 | assigned_dev->host_busnr, | |
112 | PCI_SLOT(assigned_dev->host_devfn), | |
113 | PCI_FUNC(assigned_dev->host_devfn)); | |
62c476c7 | 114 | |
260782bc WH |
115 | return 0; |
116 | } | |
62c476c7 | 117 | |
0a920356 WH |
118 | int kvm_deassign_device(struct kvm *kvm, |
119 | struct kvm_assigned_dev_kernel *assigned_dev) | |
120 | { | |
19de40a8 | 121 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
0a920356 WH |
122 | struct pci_dev *pdev = NULL; |
123 | ||
124 | /* check if iommu exists and in use */ | |
125 | if (!domain) | |
126 | return 0; | |
127 | ||
128 | pdev = assigned_dev->dev; | |
129 | if (pdev == NULL) | |
130 | return -ENODEV; | |
131 | ||
19de40a8 | 132 | iommu_detach_device(domain, &pdev->dev); |
0a920356 WH |
133 | |
134 | printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n", | |
135 | assigned_dev->host_busnr, | |
136 | PCI_SLOT(assigned_dev->host_devfn), | |
137 | PCI_FUNC(assigned_dev->host_devfn)); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
260782bc WH |
142 | int kvm_iommu_map_guest(struct kvm *kvm) |
143 | { | |
144 | int r; | |
145 | ||
19de40a8 JR |
146 | if (!iommu_found()) { |
147 | printk(KERN_ERR "%s: iommu not found\n", __func__); | |
62c476c7 BAY |
148 | return -ENODEV; |
149 | } | |
150 | ||
19de40a8 JR |
151 | kvm->arch.iommu_domain = iommu_domain_alloc(); |
152 | if (!kvm->arch.iommu_domain) | |
260782bc | 153 | return -ENOMEM; |
62c476c7 BAY |
154 | |
155 | r = kvm_iommu_map_memslots(kvm); | |
156 | if (r) | |
157 | goto out_unmap; | |
158 | ||
62c476c7 BAY |
159 | return 0; |
160 | ||
161 | out_unmap: | |
162 | kvm_iommu_unmap_memslots(kvm); | |
163 | return r; | |
164 | } | |
165 | ||
166 | static void kvm_iommu_put_pages(struct kvm *kvm, | |
260782bc | 167 | gfn_t base_gfn, unsigned long npages) |
62c476c7 BAY |
168 | { |
169 | gfn_t gfn = base_gfn; | |
170 | pfn_t pfn; | |
19de40a8 | 171 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
260782bc WH |
172 | unsigned long i; |
173 | u64 phys; | |
174 | ||
175 | /* check if iommu exists and in use */ | |
176 | if (!domain) | |
177 | return; | |
62c476c7 BAY |
178 | |
179 | for (i = 0; i < npages; i++) { | |
19de40a8 | 180 | phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); |
260782bc | 181 | pfn = phys >> PAGE_SHIFT; |
62c476c7 BAY |
182 | kvm_release_pfn_clean(pfn); |
183 | gfn++; | |
184 | } | |
260782bc | 185 | |
19de40a8 | 186 | iommu_unmap_range(domain, gfn_to_gpa(base_gfn), PAGE_SIZE * npages); |
62c476c7 BAY |
187 | } |
188 | ||
189 | static int kvm_iommu_unmap_memslots(struct kvm *kvm) | |
190 | { | |
191 | int i; | |
682edb4c | 192 | |
62c476c7 BAY |
193 | for (i = 0; i < kvm->nmemslots; i++) { |
194 | kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn, | |
195 | kvm->memslots[i].npages); | |
196 | } | |
62c476c7 BAY |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
201 | int kvm_iommu_unmap_guest(struct kvm *kvm) | |
202 | { | |
19de40a8 | 203 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
62c476c7 BAY |
204 | |
205 | /* check if iommu exists and in use */ | |
206 | if (!domain) | |
207 | return 0; | |
208 | ||
62c476c7 | 209 | kvm_iommu_unmap_memslots(kvm); |
19de40a8 | 210 | iommu_domain_free(domain); |
62c476c7 BAY |
211 | return 0; |
212 | } |