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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>
Paul Gortmaker51441d42011-07-27 21:25:05 -040028#include <linux/module.h>
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030029#include <linux/pci.h>
Paul Gortmaker799fd8b2011-07-27 21:17:59 -040030#include <linux/stat.h>
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030031#include <linux/dmar.h>
Joerg Roedel19de40a2008-12-03 14:43:34 +010032#include <linux/iommu.h>
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030033#include <linux/intel-iommu.h>
34
Alex Williamson3f68b0312011-07-14 13:27:03 -060035static int allow_unsafe_assigned_interrupts;
36module_param_named(allow_unsafe_assigned_interrupts,
37 allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
38MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
39 "Enable device assignment on platforms without interrupt remapping support.");
40
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030041static int kvm_iommu_unmap_memslots(struct kvm *kvm);
42static void kvm_iommu_put_pages(struct kvm *kvm,
43 gfn_t base_gfn, unsigned long npages);
44
Joerg Roedelfcd95802010-01-11 16:38:18 +010045static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
46 gfn_t gfn, unsigned long size)
47{
48 gfn_t end_gfn;
49 pfn_t pfn;
50
51 pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
52 end_gfn = gfn + (size >> PAGE_SHIFT);
53 gfn += 1;
54
55 if (is_error_pfn(pfn))
56 return pfn;
57
58 while (gfn < end_gfn)
59 gfn_to_pfn_memslot(kvm, slot, gfn++);
60
61 return pfn;
62}
63
Marcelo Tosatti3ad26d82009-12-23 14:35:20 -020064int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030065{
Joerg Roedelfcd95802010-01-11 16:38:18 +010066 gfn_t gfn, end_gfn;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030067 pfn_t pfn;
Joerg Roedelfcd95802010-01-11 16:38:18 +010068 int r = 0;
Joerg Roedel19de40a2008-12-03 14:43:34 +010069 struct iommu_domain *domain = kvm->arch.iommu_domain;
Sheng Yang522c68c2009-04-27 20:35:43 +080070 int flags;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030071
72 /* check if iommu exists and in use */
73 if (!domain)
74 return 0;
75
Joerg Roedelfcd95802010-01-11 16:38:18 +010076 gfn = slot->base_gfn;
77 end_gfn = gfn + slot->npages;
78
Sheng Yang522c68c2009-04-27 20:35:43 +080079 flags = IOMMU_READ | IOMMU_WRITE;
80 if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
81 flags |= IOMMU_CACHE;
82
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +030083
Joerg Roedelfcd95802010-01-11 16:38:18 +010084 while (gfn < end_gfn) {
85 unsigned long page_size;
86
87 /* Check if already mapped */
88 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
89 gfn += 1;
90 continue;
91 }
92
93 /* Get the page size we could use to map */
94 page_size = kvm_host_page_size(kvm, gfn);
95
96 /* Make sure the page_size does not exceed the memslot */
97 while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
98 page_size >>= 1;
99
100 /* Make sure gfn is aligned to the page size we want to map */
101 while ((gfn << PAGE_SHIFT) & (page_size - 1))
102 page_size >>= 1;
103
104 /*
105 * Pin all pages we are about to map in memory. This is
106 * important because we unmap and unpin in 4kb steps later.
107 */
108 pfn = kvm_pin_pages(kvm, slot, gfn, page_size);
109 if (is_error_pfn(pfn)) {
110 gfn += 1;
111 continue;
112 }
113
114 /* Map into IO address space */
115 r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +0200116 page_size, flags);
Weidong Hane5fcfc82008-09-25 23:32:02 +0800117 if (r) {
Weidong Han260782b2008-12-02 21:03:39 +0800118 printk(KERN_ERR "kvm_iommu_map_address:"
Joerg Roedel5689cc52010-07-01 16:00:12 +0200119 "iommu failed to map pfn=%llx\n", pfn);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300120 goto unmap_pages;
121 }
Joerg Roedelfcd95802010-01-11 16:38:18 +0100122
123 gfn += page_size >> PAGE_SHIFT;
124
125
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300126 }
Joerg Roedelfcd95802010-01-11 16:38:18 +0100127
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300128 return 0;
129
130unmap_pages:
Joerg Roedelfcd95802010-01-11 16:38:18 +0100131 kvm_iommu_put_pages(kvm, slot->base_gfn, gfn);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300132 return r;
133}
134
135static int kvm_iommu_map_memslots(struct kvm *kvm)
136{
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800137 int idx, r = 0;
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200138 struct kvm_memslots *slots;
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800139 struct kvm_memory_slot *memslot;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300140
Sheng Yang95c87e22010-07-01 15:00:50 +0800141 idx = srcu_read_lock(&kvm->srcu);
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800142 slots = kvm_memslots(kvm);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200143
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800144 kvm_for_each_memslot(memslot, slots) {
145 r = kvm_iommu_map_pages(kvm, memslot);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300146 if (r)
147 break;
148 }
Sheng Yang95c87e22010-07-01 15:00:50 +0800149 srcu_read_unlock(&kvm->srcu, idx);
Mark McLoughlin682edb42009-02-05 18:23:46 +0000150
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300151 return r;
152}
153
Weidong Han260782b2008-12-02 21:03:39 +0800154int kvm_assign_device(struct kvm *kvm,
155 struct kvm_assigned_dev_kernel *assigned_dev)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300156{
157 struct pci_dev *pdev = NULL;
Joerg Roedel19de40a2008-12-03 14:43:34 +0100158 struct iommu_domain *domain = kvm->arch.iommu_domain;
Sheng Yang522c68c2009-04-27 20:35:43 +0800159 int r, last_flags;
Weidong Han260782b2008-12-02 21:03:39 +0800160
161 /* check if iommu exists and in use */
162 if (!domain)
163 return 0;
164
165 pdev = assigned_dev->dev;
166 if (pdev == NULL)
167 return -ENODEV;
168
Joerg Roedel19de40a2008-12-03 14:43:34 +0100169 r = iommu_attach_device(domain, &pdev->dev);
Weidong Han260782b2008-12-02 21:03:39 +0800170 if (r) {
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800171 printk(KERN_ERR "assign device %x:%x:%x.%x failed",
172 pci_domain_nr(pdev->bus),
Weidong Han260782b2008-12-02 21:03:39 +0800173 pdev->bus->number,
174 PCI_SLOT(pdev->devfn),
175 PCI_FUNC(pdev->devfn));
176 return r;
177 }
178
Sheng Yang522c68c2009-04-27 20:35:43 +0800179 last_flags = kvm->arch.iommu_flags;
180 if (iommu_domain_has_cap(kvm->arch.iommu_domain,
181 IOMMU_CAP_CACHE_COHERENCY))
182 kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
183
184 /* Check if need to update IOMMU page table for guest memory */
185 if ((last_flags ^ kvm->arch.iommu_flags) ==
186 KVM_IOMMU_CACHE_COHERENCY) {
187 kvm_iommu_unmap_memslots(kvm);
188 r = kvm_iommu_map_memslots(kvm);
189 if (r)
190 goto out_unmap;
191 }
192
Greg Rose67778292011-07-22 05:46:07 +0000193 pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
194
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800195 printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
196 assigned_dev->host_segnr,
Weidong Han260782b2008-12-02 21:03:39 +0800197 assigned_dev->host_busnr,
198 PCI_SLOT(assigned_dev->host_devfn),
199 PCI_FUNC(assigned_dev->host_devfn));
200
201 return 0;
Sheng Yang522c68c2009-04-27 20:35:43 +0800202out_unmap:
203 kvm_iommu_unmap_memslots(kvm);
204 return r;
Weidong Han260782b2008-12-02 21:03:39 +0800205}
206
Weidong Han0a920352008-12-02 21:24:23 +0800207int kvm_deassign_device(struct kvm *kvm,
208 struct kvm_assigned_dev_kernel *assigned_dev)
209{
Joerg Roedel19de40a2008-12-03 14:43:34 +0100210 struct iommu_domain *domain = kvm->arch.iommu_domain;
Weidong Han0a920352008-12-02 21:24:23 +0800211 struct pci_dev *pdev = NULL;
212
213 /* check if iommu exists and in use */
214 if (!domain)
215 return 0;
216
217 pdev = assigned_dev->dev;
218 if (pdev == NULL)
219 return -ENODEV;
220
Joerg Roedel19de40a2008-12-03 14:43:34 +0100221 iommu_detach_device(domain, &pdev->dev);
Weidong Han0a920352008-12-02 21:24:23 +0800222
Greg Rose67778292011-07-22 05:46:07 +0000223 pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
224
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800225 printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
226 assigned_dev->host_segnr,
Weidong Han0a920352008-12-02 21:24:23 +0800227 assigned_dev->host_busnr,
228 PCI_SLOT(assigned_dev->host_devfn),
229 PCI_FUNC(assigned_dev->host_devfn));
230
231 return 0;
232}
233
Weidong Han260782b2008-12-02 21:03:39 +0800234int kvm_iommu_map_guest(struct kvm *kvm)
235{
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300236 int r;
237
Joerg Roedela1b60c12011-09-06 18:46:34 +0200238 if (!iommu_present(&pci_bus_type)) {
Joerg Roedel19de40a2008-12-03 14:43:34 +0100239 printk(KERN_ERR "%s: iommu not found\n", __func__);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300240 return -ENODEV;
241 }
242
Joerg Roedel905d66c2011-09-06 16:03:26 +0200243 kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
Joerg Roedel19de40a2008-12-03 14:43:34 +0100244 if (!kvm->arch.iommu_domain)
Weidong Han260782b2008-12-02 21:03:39 +0800245 return -ENOMEM;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300246
Alex Williamson3f68b0312011-07-14 13:27:03 -0600247 if (!allow_unsafe_assigned_interrupts &&
248 !iommu_domain_has_cap(kvm->arch.iommu_domain,
249 IOMMU_CAP_INTR_REMAP)) {
250 printk(KERN_WARNING "%s: No interrupt remapping support,"
251 " disallowing device assignment."
252 " Re-enble with \"allow_unsafe_assigned_interrupts=1\""
253 " module option.\n", __func__);
254 iommu_domain_free(kvm->arch.iommu_domain);
255 kvm->arch.iommu_domain = NULL;
256 return -EPERM;
257 }
258
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300259 r = kvm_iommu_map_memslots(kvm);
260 if (r)
261 goto out_unmap;
262
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300263 return 0;
264
265out_unmap:
266 kvm_iommu_unmap_memslots(kvm);
267 return r;
268}
269
Joerg Roedelfcd95802010-01-11 16:38:18 +0100270static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
271{
272 unsigned long i;
273
274 for (i = 0; i < npages; ++i)
275 kvm_release_pfn_clean(pfn + i);
276}
277
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300278static void kvm_iommu_put_pages(struct kvm *kvm,
Weidong Han260782b2008-12-02 21:03:39 +0800279 gfn_t base_gfn, unsigned long npages)
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300280{
Joerg Roedelfcd95802010-01-11 16:38:18 +0100281 struct iommu_domain *domain;
282 gfn_t end_gfn, gfn;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300283 pfn_t pfn;
Weidong Han260782b2008-12-02 21:03:39 +0800284 u64 phys;
285
Joerg Roedelfcd95802010-01-11 16:38:18 +0100286 domain = kvm->arch.iommu_domain;
287 end_gfn = base_gfn + npages;
288 gfn = base_gfn;
289
Weidong Han260782b2008-12-02 21:03:39 +0800290 /* check if iommu exists and in use */
291 if (!domain)
292 return;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300293
Joerg Roedelfcd95802010-01-11 16:38:18 +0100294 while (gfn < end_gfn) {
295 unsigned long unmap_pages;
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +0200296 size_t size;
Weidong Han260782b2008-12-02 21:03:39 +0800297
Joerg Roedelfcd95802010-01-11 16:38:18 +0100298 /* Get physical address */
299 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
300 pfn = phys >> PAGE_SHIFT;
301
302 /* Unmap address from IO address space */
Ohad Ben-Cohen7d3002c2011-11-10 11:32:26 +0200303 size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
304 unmap_pages = 1ULL << get_order(size);
Joerg Roedelfcd95802010-01-11 16:38:18 +0100305
306 /* Unpin all pages we just unmapped to not leak any memory */
307 kvm_unpin_pages(kvm, pfn, unmap_pages);
308
309 gfn += unmap_pages;
310 }
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300311}
312
313static int kvm_iommu_unmap_memslots(struct kvm *kvm)
314{
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800315 int idx;
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200316 struct kvm_memslots *slots;
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800317 struct kvm_memory_slot *memslot;
Mark McLoughlin682edb42009-02-05 18:23:46 +0000318
Sheng Yang95c87e22010-07-01 15:00:50 +0800319 idx = srcu_read_lock(&kvm->srcu);
Lai Jiangshan90d83dc2010-04-19 17:41:23 +0800320 slots = kvm_memslots(kvm);
Marcelo Tosatti46a26bf2009-12-23 14:35:16 -0200321
Xiao Guangrongbe6ba0f2011-11-24 17:39:18 +0800322 kvm_for_each_memslot(memslot, slots)
323 kvm_iommu_put_pages(kvm, memslot->base_gfn, memslot->npages);
324
Sheng Yang95c87e22010-07-01 15:00:50 +0800325 srcu_read_unlock(&kvm->srcu, idx);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300326
327 return 0;
328}
329
330int kvm_iommu_unmap_guest(struct kvm *kvm)
331{
Joerg Roedel19de40a2008-12-03 14:43:34 +0100332 struct iommu_domain *domain = kvm->arch.iommu_domain;
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300333
334 /* check if iommu exists and in use */
335 if (!domain)
336 return 0;
337
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300338 kvm_iommu_unmap_memslots(kvm);
Joerg Roedel19de40a2008-12-03 14:43:34 +0100339 iommu_domain_free(domain);
Ben-Ami Yassour62c476c2008-09-14 03:48:28 +0300340 return 0;
341}