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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 | * 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/iommu.h> |
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, struct kvm_memory_slot *slot) |
36 | { |
37 | gfn_t gfn = slot->base_gfn; |
38 | unsigned long npages = slot->npages; |
39 | pfn_t pfn; |
40 | int i, r = 0; |
41 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
42 | int flags; |
43 | |
44 | /* check if iommu exists and in use */ |
45 | if (!domain) |
46 | return 0; |
47 | |
48 | flags = IOMMU_READ | IOMMU_WRITE; |
49 | if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY) |
50 | flags |= IOMMU_CACHE; |
51 | |
52 | for (i = 0; i < npages; i++) { |
53 | /* check if already mapped */ |
54 | if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) |
55 | continue; |
56 | |
57 | pfn = gfn_to_pfn_memslot(kvm, slot, gfn); |
58 | r = iommu_map_range(domain, |
59 | gfn_to_gpa(gfn), |
60 | pfn_to_hpa(pfn), |
61 | PAGE_SIZE, flags); |
62 | if (r) { |
63 | printk(KERN_ERR "kvm_iommu_map_address:" |
64 | "iommu failed to map pfn=%lx\n", pfn); |
65 | goto unmap_pages; |
66 | } |
67 | gfn++; |
68 | } |
69 | return 0; |
70 | |
71 | unmap_pages: |
72 | kvm_iommu_put_pages(kvm, slot->base_gfn, i); |
73 | return r; |
74 | } |
75 | |
76 | static int kvm_iommu_map_memslots(struct kvm *kvm) |
77 | { |
78 | int i, r = 0; |
79 | struct kvm_memslots *slots; |
80 | |
81 | slots = rcu_dereference(kvm->memslots); |
82 | |
83 | for (i = 0; i < slots->nmemslots; i++) { |
84 | r = kvm_iommu_map_pages(kvm, &slots->memslots[i]); |
85 | if (r) |
86 | break; |
87 | } |
88 | |
89 | return r; |
90 | } |
91 | |
92 | int kvm_assign_device(struct kvm *kvm, |
93 | struct kvm_assigned_dev_kernel *assigned_dev) |
94 | { |
95 | struct pci_dev *pdev = NULL; |
96 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
97 | int r, last_flags; |
98 | |
99 | /* check if iommu exists and in use */ |
100 | if (!domain) |
101 | return 0; |
102 | |
103 | pdev = assigned_dev->dev; |
104 | if (pdev == NULL) |
105 | return -ENODEV; |
106 | |
107 | r = iommu_attach_device(domain, &pdev->dev); |
108 | if (r) { |
109 | printk(KERN_ERR "assign device %x:%x:%x.%x failed", |
110 | pci_domain_nr(pdev->bus), |
111 | pdev->bus->number, |
112 | PCI_SLOT(pdev->devfn), |
113 | PCI_FUNC(pdev->devfn)); |
114 | return r; |
115 | } |
116 | |
117 | last_flags = kvm->arch.iommu_flags; |
118 | if (iommu_domain_has_cap(kvm->arch.iommu_domain, |
119 | IOMMU_CAP_CACHE_COHERENCY)) |
120 | kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY; |
121 | |
122 | /* Check if need to update IOMMU page table for guest memory */ |
123 | if ((last_flags ^ kvm->arch.iommu_flags) == |
124 | KVM_IOMMU_CACHE_COHERENCY) { |
125 | kvm_iommu_unmap_memslots(kvm); |
126 | r = kvm_iommu_map_memslots(kvm); |
127 | if (r) |
128 | goto out_unmap; |
129 | } |
130 | |
131 | printk(KERN_DEBUG "assign device %x:%x:%x.%x\n", |
132 | assigned_dev->host_segnr, |
133 | assigned_dev->host_busnr, |
134 | PCI_SLOT(assigned_dev->host_devfn), |
135 | PCI_FUNC(assigned_dev->host_devfn)); |
136 | |
137 | return 0; |
138 | out_unmap: |
139 | kvm_iommu_unmap_memslots(kvm); |
140 | return r; |
141 | } |
142 | |
143 | int kvm_deassign_device(struct kvm *kvm, |
144 | struct kvm_assigned_dev_kernel *assigned_dev) |
145 | { |
146 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
147 | struct pci_dev *pdev = NULL; |
148 | |
149 | /* check if iommu exists and in use */ |
150 | if (!domain) |
151 | return 0; |
152 | |
153 | pdev = assigned_dev->dev; |
154 | if (pdev == NULL) |
155 | return -ENODEV; |
156 | |
157 | iommu_detach_device(domain, &pdev->dev); |
158 | |
159 | printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n", |
160 | assigned_dev->host_segnr, |
161 | assigned_dev->host_busnr, |
162 | PCI_SLOT(assigned_dev->host_devfn), |
163 | PCI_FUNC(assigned_dev->host_devfn)); |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | int kvm_iommu_map_guest(struct kvm *kvm) |
169 | { |
170 | int r; |
171 | |
172 | if (!iommu_found()) { |
173 | printk(KERN_ERR "%s: iommu not found\n", __func__); |
174 | return -ENODEV; |
175 | } |
176 | |
177 | kvm->arch.iommu_domain = iommu_domain_alloc(); |
178 | if (!kvm->arch.iommu_domain) |
179 | return -ENOMEM; |
180 | |
181 | r = kvm_iommu_map_memslots(kvm); |
182 | if (r) |
183 | goto out_unmap; |
184 | |
185 | return 0; |
186 | |
187 | out_unmap: |
188 | kvm_iommu_unmap_memslots(kvm); |
189 | return r; |
190 | } |
191 | |
192 | static void kvm_iommu_put_pages(struct kvm *kvm, |
193 | gfn_t base_gfn, unsigned long npages) |
194 | { |
195 | gfn_t gfn = base_gfn; |
196 | pfn_t pfn; |
197 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
198 | unsigned long i; |
199 | u64 phys; |
200 | |
201 | /* check if iommu exists and in use */ |
202 | if (!domain) |
203 | return; |
204 | |
205 | for (i = 0; i < npages; i++) { |
206 | phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn)); |
207 | pfn = phys >> PAGE_SHIFT; |
208 | kvm_release_pfn_clean(pfn); |
209 | gfn++; |
210 | } |
211 | |
212 | iommu_unmap_range(domain, gfn_to_gpa(base_gfn), PAGE_SIZE * npages); |
213 | } |
214 | |
215 | static int kvm_iommu_unmap_memslots(struct kvm *kvm) |
216 | { |
217 | int i; |
218 | struct kvm_memslots *slots; |
219 | |
220 | slots = rcu_dereference(kvm->memslots); |
221 | |
222 | for (i = 0; i < slots->nmemslots; i++) { |
223 | kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn, |
224 | slots->memslots[i].npages); |
225 | } |
226 | |
227 | return 0; |
228 | } |
229 | |
230 | int kvm_iommu_unmap_guest(struct kvm *kvm) |
231 | { |
232 | struct iommu_domain *domain = kvm->arch.iommu_domain; |
233 | |
234 | /* check if iommu exists and in use */ |
235 | if (!domain) |
236 | return 0; |
237 | |
238 | kvm_iommu_unmap_memslots(kvm); |
239 | iommu_domain_free(domain); |
240 | return 0; |
241 | } |
242 |
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