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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
33static int kvm_iommu_unmap_memslots(struct kvm *kvm);
34static void kvm_iommu_put_pages(struct kvm *kvm,
35 gfn_t base_gfn, unsigned long npages);
36
Joerg Roedelfcd95802010-01-11 16:38:18 +010037static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
38 gfn_t gfn, unsigned long size)
39{
40 gfn_t end_gfn;
41 pfn_t pfn;
42
43 pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
44 end_gfn = gfn + (size >> PAGE_SHIFT);
45 gfn += 1;
46
47 if (is_error_pfn(pfn))
48 return pfn;
49
50 while (gfn < end_gfn)
51 gfn_to_pfn_memslot(kvm, slot, gfn++);
52
53 return pfn;
54}
55
Marcelo Tosatti3ad26d82009-12-23 14:35:20 -020056int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030057{
Joerg Roedelfcd95802010-01-11 16:38:18 +010058 gfn_t gfn, end_gfn;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030059 pfn_t pfn;
Joerg Roedelfcd95802010-01-11 16:38:18 +010060 int r = 0;
Joerg Roedel19de40a2008-12-03 14:43:34 +010061 struct iommu_domain *domain = kvm->arch.iommu_domain;
Sheng Yang522c68c2009-04-27 20:35:43 +080062 int flags;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030063
64 /* check if iommu exists and in use */
65 if (!domain)
66 return 0;
67
Joerg Roedelfcd95802010-01-11 16:38:18 +010068 gfn = slot->base_gfn;
69 end_gfn = gfn + slot->npages;
70
Sheng Yang522c68c2009-04-27 20:35:43 +080071 flags = IOMMU_READ | IOMMU_WRITE;
72 if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
73 flags |= IOMMU_CACHE;
74
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030075
Joerg Roedelfcd95802010-01-11 16:38:18 +010076 while (gfn < end_gfn) {
77 unsigned long page_size;
78
79 /* Check if already mapped */
80 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
81 gfn += 1;
82 continue;
83 }
84
85 /* Get the page size we could use to map */
86 page_size = kvm_host_page_size(kvm, gfn);
87
88 /* Make sure the page_size does not exceed the memslot */
89 while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
90 page_size >>= 1;
91
92 /* Make sure gfn is aligned to the page size we want to map */
93 while ((gfn << PAGE_SHIFT) & (page_size - 1))
94 page_size >>= 1;
95
96 /*
97 * Pin all pages we are about to map in memory. This is
98 * important because we unmap and unpin in 4kb steps later.
99 */
100 pfn = kvm_pin_pages(kvm, slot, gfn, page_size);
101 if (is_error_pfn(pfn)) {
102 gfn += 1;
103 continue;
104 }
105
106 /* Map into IO address space */
107 r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
108 get_order(page_size), flags);
Weidong Hane5fcfc82008-09-25 23:32:02 +0800109 if (r) {
Weidong Han260782b2008-12-02 21:03:39 +0800110 printk(KERN_ERR "kvm_iommu_map_address:"
Joerg Roedel5689cc52010-07-01 16:00:12 +0200111 "iommu failed to map pfn=%llx\n", pfn);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300112 goto unmap_pages;
113 }
Joerg Roedelfcd95802010-01-11 16:38:18 +0100114
115 gfn += page_size >> PAGE_SHIFT;
116
117
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300118 }
Joerg Roedelfcd95802010-01-11 16:38:18 +0100119
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300120 return 0;
121
122unmap_pages:
Joerg Roedelfcd95802010-01-11 16:38:18 +0100123 kvm_iommu_put_pages(kvm, slot->base_gfn, gfn);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300124 return r;
125}
126
127static int kvm_iommu_map_memslots(struct kvm *kvm)
128{
Sheng Yang95c87e22010-07-01 15:00:50 +0800129 int i, idx, r = 0;
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200130 struct kvm_memslots *slots;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300131
Sheng Yang95c87e22010-07-01 15:00:50 +0800132 idx = srcu_read_lock(&kvm->srcu);
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800133 slots = kvm_memslots(kvm);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200134
135 for (i = 0; i < slots->nmemslots; i++) {
Marcelo Tosatti3ad26d82009-12-23 14:35:20 -0200136 r = kvm_iommu_map_pages(kvm, &slots->memslots[i]);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300137 if (r)
138 break;
139 }
Sheng Yang95c87e22010-07-01 15:00:50 +0800140 srcu_read_unlock(&kvm->srcu, idx);
Mark McLoughlin682edb42009-02-05 18:23:46 +0000141
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300142 return r;
143}
144
Weidong Han260782b2008-12-02 21:03:39 +0800145int kvm_assign_device(struct kvm *kvm,
146 struct kvm_assigned_dev_kernel *assigned_dev)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300147{
148 struct pci_dev *pdev = NULL;
Joerg Roedel19de40a2008-12-03 14:43:34 +0100149 struct iommu_domain *domain = kvm->arch.iommu_domain;
Sheng Yang522c68c2009-04-27 20:35:43 +0800150 int r, last_flags;
Weidong Han260782b2008-12-02 21:03:39 +0800151
152 /* check if iommu exists and in use */
153 if (!domain)
154 return 0;
155
156 pdev = assigned_dev->dev;
157 if (pdev == NULL)
158 return -ENODEV;
159
Joerg Roedel19de40a2008-12-03 14:43:34 +0100160 r = iommu_attach_device(domain, &pdev->dev);
Weidong Han260782b2008-12-02 21:03:39 +0800161 if (r) {
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800162 printk(KERN_ERR "assign device %x:%x:%x.%x failed",
163 pci_domain_nr(pdev->bus),
Weidong Han260782b2008-12-02 21:03:39 +0800164 pdev->bus->number,
165 PCI_SLOT(pdev->devfn),
166 PCI_FUNC(pdev->devfn));
167 return r;
168 }
169
Sheng Yang522c68c2009-04-27 20:35:43 +0800170 last_flags = kvm->arch.iommu_flags;
171 if (iommu_domain_has_cap(kvm->arch.iommu_domain,
172 IOMMU_CAP_CACHE_COHERENCY))
173 kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
174
175 /* Check if need to update IOMMU page table for guest memory */
176 if ((last_flags ^ kvm->arch.iommu_flags) ==
177 KVM_IOMMU_CACHE_COHERENCY) {
178 kvm_iommu_unmap_memslots(kvm);
179 r = kvm_iommu_map_memslots(kvm);
180 if (r)
181 goto out_unmap;
182 }
183
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800184 printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
185 assigned_dev->host_segnr,
Weidong Han260782b2008-12-02 21:03:39 +0800186 assigned_dev->host_busnr,
187 PCI_SLOT(assigned_dev->host_devfn),
188 PCI_FUNC(assigned_dev->host_devfn));
189
190 return 0;
Sheng Yang522c68c2009-04-27 20:35:43 +0800191out_unmap:
192 kvm_iommu_unmap_memslots(kvm);
193 return r;
Weidong Han260782b2008-12-02 21:03:39 +0800194}
195
Weidong Han0a920352008-12-02 21:24:23 +0800196int kvm_deassign_device(struct kvm *kvm,
197 struct kvm_assigned_dev_kernel *assigned_dev)
198{
Joerg Roedel19de40a2008-12-03 14:43:34 +0100199 struct iommu_domain *domain = kvm->arch.iommu_domain;
Weidong Han0a920352008-12-02 21:24:23 +0800200 struct pci_dev *pdev = NULL;
201
202 /* check if iommu exists and in use */
203 if (!domain)
204 return 0;
205
206 pdev = assigned_dev->dev;
207 if (pdev == NULL)
208 return -ENODEV;
209
Joerg Roedel19de40a2008-12-03 14:43:34 +0100210 iommu_detach_device(domain, &pdev->dev);
Weidong Han0a920352008-12-02 21:24:23 +0800211
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800212 printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
213 assigned_dev->host_segnr,
Weidong Han0a920352008-12-02 21:24:23 +0800214 assigned_dev->host_busnr,
215 PCI_SLOT(assigned_dev->host_devfn),
216 PCI_FUNC(assigned_dev->host_devfn));
217
218 return 0;
219}
220
Weidong Han260782b2008-12-02 21:03:39 +0800221int kvm_iommu_map_guest(struct kvm *kvm)
222{
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300223 int r;
224
Joerg Roedel19de40a2008-12-03 14:43:34 +0100225 if (!iommu_found()) {
226 printk(KERN_ERR "%s: iommu not found\n", __func__);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300227 return -ENODEV;
228 }
229
Joerg Roedel19de40a2008-12-03 14:43:34 +0100230 kvm->arch.iommu_domain = iommu_domain_alloc();
231 if (!kvm->arch.iommu_domain)
Weidong Han260782b2008-12-02 21:03:39 +0800232 return -ENOMEM;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300233
234 r = kvm_iommu_map_memslots(kvm);
235 if (r)
236 goto out_unmap;
237
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300238 return 0;
239
240out_unmap:
241 kvm_iommu_unmap_memslots(kvm);
242 return r;
243}
244
Joerg Roedelfcd95802010-01-11 16:38:18 +0100245static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
246{
247 unsigned long i;
248
249 for (i = 0; i < npages; ++i)
250 kvm_release_pfn_clean(pfn + i);
251}
252
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300253static void kvm_iommu_put_pages(struct kvm *kvm,
Weidong Han260782b2008-12-02 21:03:39 +0800254 gfn_t base_gfn, unsigned long npages)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300255{
Joerg Roedelfcd95802010-01-11 16:38:18 +0100256 struct iommu_domain *domain;
257 gfn_t end_gfn, gfn;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300258 pfn_t pfn;
Weidong Han260782b2008-12-02 21:03:39 +0800259 u64 phys;
260
Joerg Roedelfcd95802010-01-11 16:38:18 +0100261 domain = kvm->arch.iommu_domain;
262 end_gfn = base_gfn + npages;
263 gfn = base_gfn;
264
Weidong Han260782b2008-12-02 21:03:39 +0800265 /* check if iommu exists and in use */
266 if (!domain)
267 return;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300268
Joerg Roedelfcd95802010-01-11 16:38:18 +0100269 while (gfn < end_gfn) {
270 unsigned long unmap_pages;
271 int order;
Weidong Han260782b2008-12-02 21:03:39 +0800272
Joerg Roedelfcd95802010-01-11 16:38:18 +0100273 /* Get physical address */
274 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
275 pfn = phys >> PAGE_SHIFT;
276
277 /* Unmap address from IO address space */
Jan Kiszka05b782a2010-05-26 21:36:33 +0200278 order = iommu_unmap(domain, gfn_to_gpa(gfn), 0);
Joerg Roedelfcd95802010-01-11 16:38:18 +0100279 unmap_pages = 1ULL << order;
280
281 /* Unpin all pages we just unmapped to not leak any memory */
282 kvm_unpin_pages(kvm, pfn, unmap_pages);
283
284 gfn += unmap_pages;
285 }
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300286}
287
288static int kvm_iommu_unmap_memslots(struct kvm *kvm)
289{
Sheng Yang95c87e22010-07-01 15:00:50 +0800290 int i, idx;
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200291 struct kvm_memslots *slots;
Mark McLoughlin682edb42009-02-05 18:23:46 +0000292
Sheng Yang95c87e22010-07-01 15:00:50 +0800293 idx = srcu_read_lock(&kvm->srcu);
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800294 slots = kvm_memslots(kvm);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200295
296 for (i = 0; i < slots->nmemslots; i++) {
297 kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn,
298 slots->memslots[i].npages);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300299 }
Sheng Yang95c87e22010-07-01 15:00:50 +0800300 srcu_read_unlock(&kvm->srcu, idx);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300301
302 return 0;
303}
304
305int kvm_iommu_unmap_guest(struct kvm *kvm)
306{
Joerg Roedel19de40a2008-12-03 14:43:34 +0100307 struct iommu_domain *domain = kvm->arch.iommu_domain;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300308
309 /* check if iommu exists and in use */
310 if (!domain)
311 return 0;
312
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300313 kvm_iommu_unmap_memslots(kvm);
Joerg Roedel19de40a2008-12-03 14:43:34 +0100314 iommu_domain_free(domain);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300315 return 0;
316}