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/pci.h>
29 #include <linux/dmar.h>
30 #include <linux/iommu.h>
31 #include <linux/intel-iommu.h>
33 static int kvm_iommu_unmap_memslots(struct kvm *kvm);
34 static void kvm_iommu_put_pages(struct kvm *kvm,
35 gfn_t base_gfn, unsigned long npages);
37 static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
38 gfn_t gfn, unsigned long size)
43 pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
44 end_gfn = gfn + (size >> PAGE_SHIFT);
47 if (is_error_pfn(pfn))
51 gfn_to_pfn_memslot(kvm, slot, gfn++);
56 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
61 struct iommu_domain *domain = kvm->arch.iommu_domain;
64 /* check if iommu exists and in use */
69 end_gfn = gfn + slot->npages;
71 flags = IOMMU_READ | IOMMU_WRITE;
72 if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
76 while (gfn < end_gfn) {
77 unsigned long page_size;
79 /* Check if already mapped */
80 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
85 /* Get the page size we could use to map */
86 page_size = kvm_host_page_size(kvm, gfn);
88 /* Make sure the page_size does not exceed the memslot */
89 while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
92 /* Make sure gfn is aligned to the page size we want to map */
93 while ((gfn << PAGE_SHIFT) & (page_size - 1))
97 * Pin all pages we are about to map in memory. This is
98 * important because we unmap and unpin in 4kb steps later.
100 pfn = kvm_pin_pages(kvm, slot, gfn, page_size);
101 if (is_error_pfn(pfn)) {
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);
110 printk(KERN_ERR "kvm_iommu_map_address:"
111 "iommu failed to map pfn=%lx\n", pfn);
115 gfn += page_size >> PAGE_SHIFT;
123 kvm_iommu_put_pages(kvm, slot->base_gfn, gfn);
127 static int kvm_iommu_map_memslots(struct kvm *kvm)
130 struct kvm_memslots *slots;
132 slots = kvm_memslots(kvm);
134 for (i = 0; i < slots->nmemslots; i++) {
135 r = kvm_iommu_map_pages(kvm, &slots->memslots[i]);
143 int kvm_assign_device(struct kvm *kvm,
144 struct kvm_assigned_dev_kernel *assigned_dev)
146 struct pci_dev *pdev = NULL;
147 struct iommu_domain *domain = kvm->arch.iommu_domain;
150 /* check if iommu exists and in use */
154 pdev = assigned_dev->dev;
158 r = iommu_attach_device(domain, &pdev->dev);
160 printk(KERN_ERR "assign device %x:%x:%x.%x failed",
161 pci_domain_nr(pdev->bus),
163 PCI_SLOT(pdev->devfn),
164 PCI_FUNC(pdev->devfn));
168 last_flags = kvm->arch.iommu_flags;
169 if (iommu_domain_has_cap(kvm->arch.iommu_domain,
170 IOMMU_CAP_CACHE_COHERENCY))
171 kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
173 /* Check if need to update IOMMU page table for guest memory */
174 if ((last_flags ^ kvm->arch.iommu_flags) ==
175 KVM_IOMMU_CACHE_COHERENCY) {
176 kvm_iommu_unmap_memslots(kvm);
177 r = kvm_iommu_map_memslots(kvm);
182 printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
183 assigned_dev->host_segnr,
184 assigned_dev->host_busnr,
185 PCI_SLOT(assigned_dev->host_devfn),
186 PCI_FUNC(assigned_dev->host_devfn));
190 kvm_iommu_unmap_memslots(kvm);
194 int kvm_deassign_device(struct kvm *kvm,
195 struct kvm_assigned_dev_kernel *assigned_dev)
197 struct iommu_domain *domain = kvm->arch.iommu_domain;
198 struct pci_dev *pdev = NULL;
200 /* check if iommu exists and in use */
204 pdev = assigned_dev->dev;
208 iommu_detach_device(domain, &pdev->dev);
210 printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
211 assigned_dev->host_segnr,
212 assigned_dev->host_busnr,
213 PCI_SLOT(assigned_dev->host_devfn),
214 PCI_FUNC(assigned_dev->host_devfn));
219 int kvm_iommu_map_guest(struct kvm *kvm)
223 if (!iommu_found()) {
224 printk(KERN_ERR "%s: iommu not found\n", __func__);
228 kvm->arch.iommu_domain = iommu_domain_alloc();
229 if (!kvm->arch.iommu_domain)
232 r = kvm_iommu_map_memslots(kvm);
239 kvm_iommu_unmap_memslots(kvm);
243 static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
247 for (i = 0; i < npages; ++i)
248 kvm_release_pfn_clean(pfn + i);
251 static void kvm_iommu_put_pages(struct kvm *kvm,
252 gfn_t base_gfn, unsigned long npages)
254 struct iommu_domain *domain;
259 domain = kvm->arch.iommu_domain;
260 end_gfn = base_gfn + npages;
263 /* check if iommu exists and in use */
267 while (gfn < end_gfn) {
268 unsigned long unmap_pages;
271 /* Get physical address */
272 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
273 pfn = phys >> PAGE_SHIFT;
275 /* Unmap address from IO address space */
276 order = iommu_unmap(domain, gfn_to_gpa(gfn), 0);
277 unmap_pages = 1ULL << order;
279 /* Unpin all pages we just unmapped to not leak any memory */
280 kvm_unpin_pages(kvm, pfn, unmap_pages);
286 static int kvm_iommu_unmap_memslots(struct kvm *kvm)
289 struct kvm_memslots *slots;
291 slots = kvm_memslots(kvm);
293 for (i = 0; i < slots->nmemslots; i++) {
294 kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn,
295 slots->memslots[i].npages);
301 int kvm_iommu_unmap_guest(struct kvm *kvm)
303 struct iommu_domain *domain = kvm->arch.iommu_domain;
305 /* check if iommu exists and in use */
309 kvm_iommu_unmap_memslots(kvm);
310 iommu_domain_free(domain);