tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
31static int kvm_iommu_unmap_memslots(struct kvm *kvm);
32static void kvm_iommu_put_pages(struct kvm *kvm,
33 gfn_t base_gfn, unsigned long npages);
34
35int 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;
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(kvm, 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
71unmap_pages:
72 kvm_iommu_put_pages(kvm, base_gfn, i);
73 return r;
74}
75
76static int kvm_iommu_map_memslots(struct kvm *kvm)
77{
78 int i, r = 0;
79
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 }
86
87 return r;
88}
89
90int kvm_assign_device(struct kvm *kvm,
91 struct kvm_assigned_dev_kernel *assigned_dev)
92{
93 struct pci_dev *pdev = NULL;
94 struct iommu_domain *domain = kvm->arch.iommu_domain;
95 int r, last_flags;
96
97 /* check if iommu exists and in use */
98 if (!domain)
99 return 0;
100
101 pdev = assigned_dev->dev;
102 if (pdev == NULL)
103 return -ENODEV;
104
105 r = iommu_attach_device(domain, &pdev->dev);
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;
112 }
113
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
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));
132
133 return 0;
134out_unmap:
135 kvm_iommu_unmap_memslots(kvm);
136 return r;
137}
138
139int kvm_deassign_device(struct kvm *kvm,
140 struct kvm_assigned_dev_kernel *assigned_dev)
141{
142 struct iommu_domain *domain = kvm->arch.iommu_domain;
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
153 iommu_detach_device(domain, &pdev->dev);
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
163int kvm_iommu_map_guest(struct kvm *kvm)
164{
165 int r;
166
167 if (!iommu_found()) {
168 printk(KERN_ERR "%s: iommu not found\n", __func__);
169 return -ENODEV;
170 }
171
172 kvm->arch.iommu_domain = iommu_domain_alloc();
173 if (!kvm->arch.iommu_domain)
174 return -ENOMEM;
175
176 r = kvm_iommu_map_memslots(kvm);
177 if (r)
178 goto out_unmap;
179
180 return 0;
181
182out_unmap:
183 kvm_iommu_unmap_memslots(kvm);
184 return r;
185}
186
187static void kvm_iommu_put_pages(struct kvm *kvm,
188 gfn_t base_gfn, unsigned long npages)
189{
190 gfn_t gfn = base_gfn;
191 pfn_t pfn;
192 struct iommu_domain *domain = kvm->arch.iommu_domain;
193 unsigned long i;
194 u64 phys;
195
196 /* check if iommu exists and in use */
197 if (!domain)
198 return;
199
200 for (i = 0; i < npages; i++) {
201 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
202 pfn = phys >> PAGE_SHIFT;
203 kvm_release_pfn_clean(pfn);
204 gfn++;
205 }
206
207 iommu_unmap_range(domain, gfn_to_gpa(base_gfn), PAGE_SIZE * npages);
208}
209
210static int kvm_iommu_unmap_memslots(struct kvm *kvm)
211{
212 int i;
213
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 }
218
219 return 0;
220}
221
222int kvm_iommu_unmap_guest(struct kvm *kvm)
223{
224 struct iommu_domain *domain = kvm->arch.iommu_domain;
225
226 /* check if iommu exists and in use */
227 if (!domain)
228 return 0;
229
230 kvm_iommu_unmap_memslots(kvm);
231 iommu_domain_free(domain);
232 return 0;
233}