1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* Copyright (c) 2006, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Copyright (C) 2006-2008 Intel Corporation
* Copyright IBM Corporation, 2008
* Author: Allen M. Kay <allen.m.kay@intel.com>
* Author: Weidong Han <weidong.han@intel.com>
* Author: Ben-Ami Yassour <benami@il.ibm.com>
*/
#include <linux/list.h>
#include <linux/kvm_host.h>
#include <linux/pci.h>
#include <linux/dmar.h>
#include <linux/intel-iommu.h>
static int kvm_iommu_unmap_memslots(struct kvm *kvm);
static void kvm_iommu_put_pages(struct kvm *kvm,
gfn_t base_gfn, unsigned long npages);
int kvm_iommu_map_pages(struct kvm *kvm,
gfn_t base_gfn, unsigned long npages)
{
gfn_t gfn = base_gfn;
pfn_t pfn;
int i, r = 0;
struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
/* check if iommu exists and in use */
if (!domain)
return 0;
for (i = 0; i < npages; i++) {
/* check if already mapped */
if (intel_iommu_iova_to_phys(domain,
gfn_to_gpa(gfn)))
continue;
pfn = gfn_to_pfn(kvm, gfn);
r = intel_iommu_map_address(domain,
gfn_to_gpa(gfn),
pfn_to_hpa(pfn),
PAGE_SIZE,
DMA_PTE_READ | DMA_PTE_WRITE);
if (r) {
printk(KERN_ERR "kvm_iommu_map_address:"
"iommu failed to map pfn=%lx\n", pfn);
goto unmap_pages;
}
gfn++;
}
return 0;
unmap_pages:
kvm_iommu_put_pages(kvm, base_gfn, i);
return r;
}
static int kvm_iommu_map_memslots(struct kvm *kvm)
{
int i, r;
down_read(&kvm->slots_lock);
for (i = 0; i < kvm->nmemslots; i++) {
r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
kvm->memslots[i].npages);
if (r)
break;
}
up_read(&kvm->slots_lock);
return r;
}
int kvm_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
struct pci_dev *pdev = NULL;
struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
int r;
/* check if iommu exists and in use */
if (!domain)
return 0;
pdev = assigned_dev->dev;
if (pdev == NULL)
return -ENODEV;
r = intel_iommu_attach_device(domain, pdev);
if (r) {
printk(KERN_ERR "assign device %x:%x.%x failed",
pdev->bus->number,
PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn));
return r;
}
printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n",
assigned_dev->host_busnr,
PCI_SLOT(assigned_dev->host_devfn),
PCI_FUNC(assigned_dev->host_devfn));
return 0;
}
int kvm_iommu_map_guest(struct kvm *kvm)
{
int r;
if (!intel_iommu_found()) {
printk(KERN_ERR "%s: intel iommu not found\n", __func__);
return -ENODEV;
}
kvm->arch.intel_iommu_domain = intel_iommu_alloc_domain();
if (!kvm->arch.intel_iommu_domain)
return -ENOMEM;
r = kvm_iommu_map_memslots(kvm);
if (r)
goto out_unmap;
return 0;
out_unmap:
kvm_iommu_unmap_memslots(kvm);
return r;
}
static void kvm_iommu_put_pages(struct kvm *kvm,
gfn_t base_gfn, unsigned long npages)
{
gfn_t gfn = base_gfn;
pfn_t pfn;
struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
unsigned long i;
u64 phys;
/* check if iommu exists and in use */
if (!domain)
return;
for (i = 0; i < npages; i++) {
phys = intel_iommu_iova_to_phys(domain,
gfn_to_gpa(gfn));
pfn = phys >> PAGE_SHIFT;
kvm_release_pfn_clean(pfn);
gfn++;
}
intel_iommu_unmap_address(domain,
gfn_to_gpa(base_gfn),
PAGE_SIZE * npages);
}
static int kvm_iommu_unmap_memslots(struct kvm *kvm)
{
int i;
down_read(&kvm->slots_lock);
for (i = 0; i < kvm->nmemslots; i++) {
kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
kvm->memslots[i].npages);
}
up_read(&kvm->slots_lock);
return 0;
}
int kvm_iommu_unmap_guest(struct kvm *kvm)
{
struct kvm_assigned_dev_kernel *entry;
struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
/* check if iommu exists and in use */
if (!domain)
return 0;
list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) {
printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
entry->host_busnr,
PCI_SLOT(entry->host_devfn),
PCI_FUNC(entry->host_devfn));
/* detach kvm dmar domain */
intel_iommu_detach_device(domain, entry->dev);
}
kvm_iommu_unmap_memslots(kvm);
intel_iommu_free_domain(domain);
return 0;
}
|
