667bf3fb64bf36853497fd1795afe349f27567b6
[linux-2.6.git] / arch / x86 / kvm / vtd.c
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;
39         int i, r;
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
46         r = -EINVAL;
47         for (i = 0; i < npages; i++) {
48                 /* check if already mapped */
49                 pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
50                                                      gfn_to_gpa(gfn));
51                 if (pfn && !is_mmio_pfn(pfn))
52                         continue;
53
54                 pfn = gfn_to_pfn(kvm, gfn);
55                 if (!is_mmio_pfn(pfn)) {
56                         r = intel_iommu_page_mapping(domain,
57                                                      gfn_to_gpa(gfn),
58                                                      pfn_to_hpa(pfn),
59                                                      PAGE_SIZE,
60                                                      DMA_PTE_READ |
61                                                      DMA_PTE_WRITE);
62                         if (r) {
63                                 printk(KERN_DEBUG "kvm_iommu_map_pages:"
64                                        "iommu failed to map pfn=%lx\n", pfn);
65                                 goto unmap_pages;
66                         }
67                 } else {
68                         printk(KERN_DEBUG "kvm_iommu_map_page:"
69                                "invalid pfn=%lx\n", pfn);
70                         goto unmap_pages;
71                 }
72                 gfn++;
73         }
74         return 0;
75
76 unmap_pages:
77         kvm_iommu_put_pages(kvm, base_gfn, i);
78         return r;
79 }
80
81 static int kvm_iommu_map_memslots(struct kvm *kvm)
82 {
83         int i, r;
84
85         down_read(&kvm->slots_lock);
86         for (i = 0; i < kvm->nmemslots; i++) {
87                 r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
88                                         kvm->memslots[i].npages);
89                 if (r)
90                         break;
91         }
92         up_read(&kvm->slots_lock);
93         return r;
94 }
95
96 int kvm_iommu_map_guest(struct kvm *kvm,
97                         struct kvm_assigned_dev_kernel *assigned_dev)
98 {
99         struct pci_dev *pdev = NULL;
100         int r;
101
102         if (!intel_iommu_found()) {
103                 printk(KERN_ERR "%s: intel iommu not found\n", __func__);
104                 return -ENODEV;
105         }
106
107         printk(KERN_DEBUG "VT-d direct map: host bdf = %x:%x:%x\n",
108                assigned_dev->host_busnr,
109                PCI_SLOT(assigned_dev->host_devfn),
110                PCI_FUNC(assigned_dev->host_devfn));
111
112         pdev = assigned_dev->dev;
113
114         if (pdev == NULL) {
115                 if (kvm->arch.intel_iommu_domain) {
116                         intel_iommu_domain_exit(kvm->arch.intel_iommu_domain);
117                         kvm->arch.intel_iommu_domain = NULL;
118                 }
119                 return -ENODEV;
120         }
121
122         kvm->arch.intel_iommu_domain = intel_iommu_domain_alloc(pdev);
123         if (!kvm->arch.intel_iommu_domain)
124                 return -ENODEV;
125
126         r = kvm_iommu_map_memslots(kvm);
127         if (r)
128                 goto out_unmap;
129
130         intel_iommu_detach_dev(kvm->arch.intel_iommu_domain,
131                                pdev->bus->number, pdev->devfn);
132
133         r = intel_iommu_context_mapping(kvm->arch.intel_iommu_domain,
134                                         pdev);
135         if (r) {
136                 printk(KERN_ERR "Domain context map for %s failed",
137                        pci_name(pdev));
138                 goto out_unmap;
139         }
140         return 0;
141
142 out_unmap:
143         kvm_iommu_unmap_memslots(kvm);
144         return r;
145 }
146
147 static void kvm_iommu_put_pages(struct kvm *kvm,
148                                gfn_t base_gfn, unsigned long npages)
149 {
150         gfn_t gfn = base_gfn;
151         pfn_t pfn;
152         struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
153         int i;
154
155         for (i = 0; i < npages; i++) {
156                 pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
157                                                      gfn_to_gpa(gfn));
158                 kvm_release_pfn_clean(pfn);
159                 gfn++;
160         }
161 }
162
163 static int kvm_iommu_unmap_memslots(struct kvm *kvm)
164 {
165         int i;
166         down_read(&kvm->slots_lock);
167         for (i = 0; i < kvm->nmemslots; i++) {
168                 kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
169                                     kvm->memslots[i].npages);
170         }
171         up_read(&kvm->slots_lock);
172
173         return 0;
174 }
175
176 int kvm_iommu_unmap_guest(struct kvm *kvm)
177 {
178         struct kvm_assigned_dev_kernel *entry;
179         struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
180
181         /* check if iommu exists and in use */
182         if (!domain)
183                 return 0;
184
185         list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) {
186                 printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
187                        entry->host_busnr,
188                        PCI_SLOT(entry->host_devfn),
189                        PCI_FUNC(entry->host_devfn));
190
191                 /* detach kvm dmar domain */
192                 intel_iommu_detach_dev(domain, entry->host_busnr,
193                                        entry->host_devfn);
194         }
195         kvm_iommu_unmap_memslots(kvm);
196         intel_iommu_domain_exit(domain);
197         return 0;
198 }