2 * Copyright (c) 2006, Intel Corporation.
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.
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
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.
17 * Copyright (C) 2006-2008 Intel Corporation
18 * Copyright IBM Corporation, 2008
19 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
21 * 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>
26 #include <linux/list.h>
27 #include <linux/kvm_host.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30 #include <linux/stat.h>
31 #include <linux/dmar.h>
32 #include <linux/iommu.h>
33 #include <linux/intel-iommu.h>
35 static int allow_unsafe_assigned_interrupts;
36 module_param_named(allow_unsafe_assigned_interrupts,
37 allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
38 MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
39 "Enable device assignment on platforms without interrupt remapping support.");
41 static int kvm_iommu_unmap_memslots(struct kvm *kvm);
42 static void kvm_iommu_put_pages(struct kvm *kvm,
43 gfn_t base_gfn, unsigned long npages);
45 static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
46 gfn_t gfn, unsigned long npages)
51 pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
52 end_gfn = gfn + npages;
55 if (is_error_pfn(pfn))
59 gfn_to_pfn_memslot(kvm, slot, gfn++);
64 static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
68 for (i = 0; i < npages; ++i)
69 kvm_release_pfn_clean(pfn + i);
72 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
77 struct iommu_domain *domain = kvm->arch.iommu_domain;
80 /* check if iommu exists and in use */
85 end_gfn = gfn + slot->npages;
87 flags = IOMMU_READ | IOMMU_WRITE;
88 if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
92 while (gfn < end_gfn) {
93 unsigned long page_size;
95 /* Check if already mapped */
96 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
101 /* Get the page size we could use to map */
102 page_size = kvm_host_page_size(kvm, gfn);
104 /* Make sure the page_size does not exceed the memslot */
105 while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
108 /* Make sure gfn is aligned to the page size we want to map */
109 while ((gfn << PAGE_SHIFT) & (page_size - 1))
112 /* Make sure hva is aligned to the page size we want to map */
113 while (gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
117 * Pin all pages we are about to map in memory. This is
118 * important because we unmap and unpin in 4kb steps later.
120 pfn = kvm_pin_pages(kvm, slot, gfn, page_size >> PAGE_SHIFT);
121 if (is_error_pfn(pfn)) {
126 /* Map into IO address space */
127 r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
128 get_order(page_size), flags);
130 printk(KERN_ERR "kvm_iommu_map_address:"
131 "iommu failed to map pfn=%llx\n", pfn);
132 kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT);
136 gfn += page_size >> PAGE_SHIFT;
144 kvm_iommu_put_pages(kvm, slot->base_gfn, gfn - slot->base_gfn);
148 static int kvm_iommu_map_memslots(struct kvm *kvm)
151 struct kvm_memslots *slots;
153 idx = srcu_read_lock(&kvm->srcu);
154 slots = kvm_memslots(kvm);
156 for (i = 0; i < slots->nmemslots; i++) {
157 r = kvm_iommu_map_pages(kvm, &slots->memslots[i]);
161 srcu_read_unlock(&kvm->srcu, idx);
166 int kvm_assign_device(struct kvm *kvm,
167 struct kvm_assigned_dev_kernel *assigned_dev)
169 struct pci_dev *pdev = NULL;
170 struct iommu_domain *domain = kvm->arch.iommu_domain;
173 /* check if iommu exists and in use */
177 pdev = assigned_dev->dev;
181 r = iommu_attach_device(domain, &pdev->dev);
183 printk(KERN_ERR "assign device %x:%x:%x.%x failed",
184 pci_domain_nr(pdev->bus),
186 PCI_SLOT(pdev->devfn),
187 PCI_FUNC(pdev->devfn));
191 last_flags = kvm->arch.iommu_flags;
192 if (iommu_domain_has_cap(kvm->arch.iommu_domain,
193 IOMMU_CAP_CACHE_COHERENCY))
194 kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
196 /* Check if need to update IOMMU page table for guest memory */
197 if ((last_flags ^ kvm->arch.iommu_flags) ==
198 KVM_IOMMU_CACHE_COHERENCY) {
199 kvm_iommu_unmap_memslots(kvm);
200 r = kvm_iommu_map_memslots(kvm);
205 pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
207 printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
208 assigned_dev->host_segnr,
209 assigned_dev->host_busnr,
210 PCI_SLOT(assigned_dev->host_devfn),
211 PCI_FUNC(assigned_dev->host_devfn));
215 kvm_iommu_unmap_memslots(kvm);
219 int kvm_deassign_device(struct kvm *kvm,
220 struct kvm_assigned_dev_kernel *assigned_dev)
222 struct iommu_domain *domain = kvm->arch.iommu_domain;
223 struct pci_dev *pdev = NULL;
225 /* check if iommu exists and in use */
229 pdev = assigned_dev->dev;
233 iommu_detach_device(domain, &pdev->dev);
235 pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
237 printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
238 assigned_dev->host_segnr,
239 assigned_dev->host_busnr,
240 PCI_SLOT(assigned_dev->host_devfn),
241 PCI_FUNC(assigned_dev->host_devfn));
246 int kvm_iommu_map_guest(struct kvm *kvm)
250 if (!iommu_present(&pci_bus_type)) {
251 printk(KERN_ERR "%s: iommu not found\n", __func__);
255 mutex_lock(&kvm->slots_lock);
257 kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
258 if (!kvm->arch.iommu_domain) {
263 if (!allow_unsafe_assigned_interrupts &&
264 !iommu_domain_has_cap(kvm->arch.iommu_domain,
265 IOMMU_CAP_INTR_REMAP)) {
266 printk(KERN_WARNING "%s: No interrupt remapping support,"
267 " disallowing device assignment."
268 " Re-enble with \"allow_unsafe_assigned_interrupts=1\""
269 " module option.\n", __func__);
270 iommu_domain_free(kvm->arch.iommu_domain);
271 kvm->arch.iommu_domain = NULL;
276 r = kvm_iommu_map_memslots(kvm);
278 kvm_iommu_unmap_memslots(kvm);
281 mutex_unlock(&kvm->slots_lock);
285 static void kvm_iommu_put_pages(struct kvm *kvm,
286 gfn_t base_gfn, unsigned long npages)
288 struct iommu_domain *domain;
293 domain = kvm->arch.iommu_domain;
294 end_gfn = base_gfn + npages;
297 /* check if iommu exists and in use */
301 while (gfn < end_gfn) {
302 unsigned long unmap_pages;
305 /* Get physical address */
306 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
307 pfn = phys >> PAGE_SHIFT;
309 /* Unmap address from IO address space */
310 order = iommu_unmap(domain, gfn_to_gpa(gfn), 0);
311 unmap_pages = 1ULL << order;
313 /* Unpin all pages we just unmapped to not leak any memory */
314 kvm_unpin_pages(kvm, pfn, unmap_pages);
320 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
322 kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
325 static int kvm_iommu_unmap_memslots(struct kvm *kvm)
328 struct kvm_memslots *slots;
330 idx = srcu_read_lock(&kvm->srcu);
331 slots = kvm_memslots(kvm);
333 for (i = 0; i < slots->nmemslots; i++)
334 kvm_iommu_unmap_pages(kvm, &slots->memslots[i]);
336 srcu_read_unlock(&kvm->srcu, idx);
341 int kvm_iommu_unmap_guest(struct kvm *kvm)
343 struct iommu_domain *domain = kvm->arch.iommu_domain;
345 /* check if iommu exists and in use */
349 mutex_lock(&kvm->slots_lock);
350 kvm_iommu_unmap_memslots(kvm);
351 kvm->arch.iommu_domain = NULL;
352 mutex_unlock(&kvm->slots_lock);
354 iommu_domain_free(domain);