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Ben-Ami Yassour62c476c2008-09-14 03:48:28 +03001/*
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
Avi Kivity221d0592010-05-23 18:37:00 +030019 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
20 *
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030021 * Author: Allen M. Kay <allen.m.kay@intel.com>
22 * Author: Weidong Han <weidong.han@intel.com>
23 * Author: Ben-Ami Yassour <benami@il.ibm.com>
24 */
25
26#include <linux/list.h>
27#include <linux/kvm_host.h>
28#include <linux/pci.h>
29#include <linux/dmar.h>
Joerg Roedel19de40a2008-12-03 14:43:34 +010030#include <linux/iommu.h>
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030031#include <linux/intel-iommu.h>
32
Alex Williamson3f68b032011-07-14 13:27:03 -060033static int allow_unsafe_assigned_interrupts;
34module_param_named(allow_unsafe_assigned_interrupts,
35 allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
36MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
37 "Enable device assignment on platforms without interrupt remapping support.");
38
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030039static int kvm_iommu_unmap_memslots(struct kvm *kvm);
40static void kvm_iommu_put_pages(struct kvm *kvm,
41 gfn_t base_gfn, unsigned long npages);
42
Joerg Roedelfcd95802010-01-11 16:38:18 +010043static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
44 gfn_t gfn, unsigned long size)
45{
46 gfn_t end_gfn;
47 pfn_t pfn;
48
49 pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
50 end_gfn = gfn + (size >> PAGE_SHIFT);
51 gfn += 1;
52
53 if (is_error_pfn(pfn))
54 return pfn;
55
56 while (gfn < end_gfn)
57 gfn_to_pfn_memslot(kvm, slot, gfn++);
58
59 return pfn;
60}
61
Marcelo Tosatti3ad26d82009-12-23 14:35:20 -020062int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030063{
Joerg Roedelfcd95802010-01-11 16:38:18 +010064 gfn_t gfn, end_gfn;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030065 pfn_t pfn;
Joerg Roedelfcd95802010-01-11 16:38:18 +010066 int r = 0;
Joerg Roedel19de40a2008-12-03 14:43:34 +010067 struct iommu_domain *domain = kvm->arch.iommu_domain;
Sheng Yang522c68c2009-04-27 20:35:43 +080068 int flags;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030069
70 /* check if iommu exists and in use */
71 if (!domain)
72 return 0;
73
Joerg Roedelfcd95802010-01-11 16:38:18 +010074 gfn = slot->base_gfn;
75 end_gfn = gfn + slot->npages;
76
Sheng Yang522c68c2009-04-27 20:35:43 +080077 flags = IOMMU_READ | IOMMU_WRITE;
78 if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
79 flags |= IOMMU_CACHE;
80
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030081
Joerg Roedelfcd95802010-01-11 16:38:18 +010082 while (gfn < end_gfn) {
83 unsigned long page_size;
84
85 /* Check if already mapped */
86 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
87 gfn += 1;
88 continue;
89 }
90
91 /* Get the page size we could use to map */
92 page_size = kvm_host_page_size(kvm, gfn);
93
94 /* Make sure the page_size does not exceed the memslot */
95 while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
96 page_size >>= 1;
97
98 /* Make sure gfn is aligned to the page size we want to map */
99 while ((gfn << PAGE_SHIFT) & (page_size - 1))
100 page_size >>= 1;
101
102 /*
103 * Pin all pages we are about to map in memory. This is
104 * important because we unmap and unpin in 4kb steps later.
105 */
106 pfn = kvm_pin_pages(kvm, slot, gfn, page_size);
107 if (is_error_pfn(pfn)) {
108 gfn += 1;
109 continue;
110 }
111
112 /* Map into IO address space */
113 r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
114 get_order(page_size), flags);
Weidong Hane5fcfc82008-09-25 23:32:02 +0800115 if (r) {
Weidong Han260782b2008-12-02 21:03:39 +0800116 printk(KERN_ERR "kvm_iommu_map_address:"
Joerg Roedel5689cc52010-07-01 16:00:12 +0200117 "iommu failed to map pfn=%llx\n", pfn);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300118 goto unmap_pages;
119 }
Joerg Roedelfcd95802010-01-11 16:38:18 +0100120
121 gfn += page_size >> PAGE_SHIFT;
122
123
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300124 }
Joerg Roedelfcd95802010-01-11 16:38:18 +0100125
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300126 return 0;
127
128unmap_pages:
Joerg Roedelfcd95802010-01-11 16:38:18 +0100129 kvm_iommu_put_pages(kvm, slot->base_gfn, gfn);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300130 return r;
131}
132
133static int kvm_iommu_map_memslots(struct kvm *kvm)
134{
Sheng Yang95c87e22010-07-01 15:00:50 +0800135 int i, idx, r = 0;
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200136 struct kvm_memslots *slots;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300137
Sheng Yang95c87e22010-07-01 15:00:50 +0800138 idx = srcu_read_lock(&kvm->srcu);
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800139 slots = kvm_memslots(kvm);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200140
141 for (i = 0; i < slots->nmemslots; i++) {
Marcelo Tosatti3ad26d82009-12-23 14:35:20 -0200142 r = kvm_iommu_map_pages(kvm, &slots->memslots[i]);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300143 if (r)
144 break;
145 }
Sheng Yang95c87e22010-07-01 15:00:50 +0800146 srcu_read_unlock(&kvm->srcu, idx);
Mark McLoughlin682edb42009-02-05 18:23:46 +0000147
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300148 return r;
149}
150
Weidong Han260782b2008-12-02 21:03:39 +0800151int kvm_assign_device(struct kvm *kvm,
152 struct kvm_assigned_dev_kernel *assigned_dev)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300153{
154 struct pci_dev *pdev = NULL;
Joerg Roedel19de40a2008-12-03 14:43:34 +0100155 struct iommu_domain *domain = kvm->arch.iommu_domain;
Sheng Yang522c68c2009-04-27 20:35:43 +0800156 int r, last_flags;
Weidong Han260782b2008-12-02 21:03:39 +0800157
158 /* check if iommu exists and in use */
159 if (!domain)
160 return 0;
161
162 pdev = assigned_dev->dev;
163 if (pdev == NULL)
164 return -ENODEV;
165
Joerg Roedel19de40a2008-12-03 14:43:34 +0100166 r = iommu_attach_device(domain, &pdev->dev);
Weidong Han260782b2008-12-02 21:03:39 +0800167 if (r) {
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800168 printk(KERN_ERR "assign device %x:%x:%x.%x failed",
169 pci_domain_nr(pdev->bus),
Weidong Han260782b2008-12-02 21:03:39 +0800170 pdev->bus->number,
171 PCI_SLOT(pdev->devfn),
172 PCI_FUNC(pdev->devfn));
173 return r;
174 }
175
Sheng Yang522c68c2009-04-27 20:35:43 +0800176 last_flags = kvm->arch.iommu_flags;
177 if (iommu_domain_has_cap(kvm->arch.iommu_domain,
178 IOMMU_CAP_CACHE_COHERENCY))
179 kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
180
181 /* Check if need to update IOMMU page table for guest memory */
182 if ((last_flags ^ kvm->arch.iommu_flags) ==
183 KVM_IOMMU_CACHE_COHERENCY) {
184 kvm_iommu_unmap_memslots(kvm);
185 r = kvm_iommu_map_memslots(kvm);
186 if (r)
187 goto out_unmap;
188 }
189
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800190 printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
191 assigned_dev->host_segnr,
Weidong Han260782b2008-12-02 21:03:39 +0800192 assigned_dev->host_busnr,
193 PCI_SLOT(assigned_dev->host_devfn),
194 PCI_FUNC(assigned_dev->host_devfn));
195
196 return 0;
Sheng Yang522c68c2009-04-27 20:35:43 +0800197out_unmap:
198 kvm_iommu_unmap_memslots(kvm);
199 return r;
Weidong Han260782b2008-12-02 21:03:39 +0800200}
201
Weidong Han0a920352008-12-02 21:24:23 +0800202int kvm_deassign_device(struct kvm *kvm,
203 struct kvm_assigned_dev_kernel *assigned_dev)
204{
Joerg Roedel19de40a2008-12-03 14:43:34 +0100205 struct iommu_domain *domain = kvm->arch.iommu_domain;
Weidong Han0a920352008-12-02 21:24:23 +0800206 struct pci_dev *pdev = NULL;
207
208 /* check if iommu exists and in use */
209 if (!domain)
210 return 0;
211
212 pdev = assigned_dev->dev;
213 if (pdev == NULL)
214 return -ENODEV;
215
Joerg Roedel19de40a2008-12-03 14:43:34 +0100216 iommu_detach_device(domain, &pdev->dev);
Weidong Han0a920352008-12-02 21:24:23 +0800217
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800218 printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
219 assigned_dev->host_segnr,
Weidong Han0a920352008-12-02 21:24:23 +0800220 assigned_dev->host_busnr,
221 PCI_SLOT(assigned_dev->host_devfn),
222 PCI_FUNC(assigned_dev->host_devfn));
223
224 return 0;
225}
226
Weidong Han260782b2008-12-02 21:03:39 +0800227int kvm_iommu_map_guest(struct kvm *kvm)
228{
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300229 int r;
230
Joerg Roedel19de40a2008-12-03 14:43:34 +0100231 if (!iommu_found()) {
232 printk(KERN_ERR "%s: iommu not found\n", __func__);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300233 return -ENODEV;
234 }
235
Joerg Roedel19de40a2008-12-03 14:43:34 +0100236 kvm->arch.iommu_domain = iommu_domain_alloc();
237 if (!kvm->arch.iommu_domain)
Weidong Han260782b2008-12-02 21:03:39 +0800238 return -ENOMEM;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300239
Alex Williamson3f68b032011-07-14 13:27:03 -0600240 if (!allow_unsafe_assigned_interrupts &&
241 !iommu_domain_has_cap(kvm->arch.iommu_domain,
242 IOMMU_CAP_INTR_REMAP)) {
243 printk(KERN_WARNING "%s: No interrupt remapping support,"
244 " disallowing device assignment."
245 " Re-enble with \"allow_unsafe_assigned_interrupts=1\""
246 " module option.\n", __func__);
247 iommu_domain_free(kvm->arch.iommu_domain);
248 kvm->arch.iommu_domain = NULL;
249 return -EPERM;
250 }
251
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300252 r = kvm_iommu_map_memslots(kvm);
253 if (r)
254 goto out_unmap;
255
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300256 return 0;
257
258out_unmap:
259 kvm_iommu_unmap_memslots(kvm);
260 return r;
261}
262
Joerg Roedelfcd95802010-01-11 16:38:18 +0100263static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
264{
265 unsigned long i;
266
267 for (i = 0; i < npages; ++i)
268 kvm_release_pfn_clean(pfn + i);
269}
270
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300271static void kvm_iommu_put_pages(struct kvm *kvm,
Weidong Han260782b2008-12-02 21:03:39 +0800272 gfn_t base_gfn, unsigned long npages)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300273{
Joerg Roedelfcd95802010-01-11 16:38:18 +0100274 struct iommu_domain *domain;
275 gfn_t end_gfn, gfn;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300276 pfn_t pfn;
Weidong Han260782b2008-12-02 21:03:39 +0800277 u64 phys;
278
Joerg Roedelfcd95802010-01-11 16:38:18 +0100279 domain = kvm->arch.iommu_domain;
280 end_gfn = base_gfn + npages;
281 gfn = base_gfn;
282
Weidong Han260782b2008-12-02 21:03:39 +0800283 /* check if iommu exists and in use */
284 if (!domain)
285 return;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300286
Joerg Roedelfcd95802010-01-11 16:38:18 +0100287 while (gfn < end_gfn) {
288 unsigned long unmap_pages;
289 int order;
Weidong Han260782b2008-12-02 21:03:39 +0800290
Joerg Roedelfcd95802010-01-11 16:38:18 +0100291 /* Get physical address */
292 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
293 pfn = phys >> PAGE_SHIFT;
294
295 /* Unmap address from IO address space */
Jan Kiszka05b782a2010-05-26 21:36:33 +0200296 order = iommu_unmap(domain, gfn_to_gpa(gfn), 0);
Joerg Roedelfcd95802010-01-11 16:38:18 +0100297 unmap_pages = 1ULL << order;
298
299 /* Unpin all pages we just unmapped to not leak any memory */
300 kvm_unpin_pages(kvm, pfn, unmap_pages);
301
302 gfn += unmap_pages;
303 }
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300304}
305
306static int kvm_iommu_unmap_memslots(struct kvm *kvm)
307{
Sheng Yang95c87e22010-07-01 15:00:50 +0800308 int i, idx;
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200309 struct kvm_memslots *slots;
Mark McLoughlin682edb42009-02-05 18:23:46 +0000310
Sheng Yang95c87e22010-07-01 15:00:50 +0800311 idx = srcu_read_lock(&kvm->srcu);
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800312 slots = kvm_memslots(kvm);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200313
314 for (i = 0; i < slots->nmemslots; i++) {
315 kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn,
316 slots->memslots[i].npages);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300317 }
Sheng Yang95c87e22010-07-01 15:00:50 +0800318 srcu_read_unlock(&kvm->srcu, idx);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300319
320 return 0;
321}
322
323int kvm_iommu_unmap_guest(struct kvm *kvm)
324{
Joerg Roedel19de40a2008-12-03 14:43:34 +0100325 struct iommu_domain *domain = kvm->arch.iommu_domain;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300326
327 /* check if iommu exists and in use */
328 if (!domain)
329 return 0;
330
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300331 kvm_iommu_unmap_memslots(kvm);
Joerg Roedel19de40a2008-12-03 14:43:34 +0100332 iommu_domain_free(domain);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300333 return 0;
334}