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 * Author: Allen M. Kay <allen.m.kay@intel.com>
20 * Author: Weidong Han <weidong.han@intel.com>
21 * Author: Ben-Ami Yassour <benami@il.ibm.com>
24 #include <linux/list.h>
25 #include <linux/kvm_host.h>
26 #include <linux/pci.h>
27 #include <linux/dmar.h>
28 #include <linux/iommu.h>
29 #include <linux/intel-iommu.h>
31 static int kvm_iommu_unmap_memslots(struct kvm *kvm);
32 static void kvm_iommu_put_pages(struct kvm *kvm,
33 gfn_t base_gfn, unsigned long npages);
35 int kvm_iommu_map_pages(struct kvm *kvm,
36 gfn_t base_gfn, unsigned long npages)
41 struct iommu_domain *domain = kvm->arch.iommu_domain;
43 /* check if iommu exists and in use */
47 for (i = 0; i < npages; i++) {
48 /* check if already mapped */
49 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn)))
52 pfn = gfn_to_pfn(kvm, gfn);
53 r = iommu_map_range(domain,
57 IOMMU_READ | IOMMU_WRITE);
59 printk(KERN_ERR "kvm_iommu_map_address:"
60 "iommu failed to map pfn=%lx\n", pfn);
68 kvm_iommu_put_pages(kvm, base_gfn, i);
72 static int kvm_iommu_map_memslots(struct kvm *kvm)
76 for (i = 0; i < kvm->nmemslots; i++) {
77 r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
78 kvm->memslots[i].npages);
86 int kvm_assign_device(struct kvm *kvm,
87 struct kvm_assigned_dev_kernel *assigned_dev)
89 struct pci_dev *pdev = NULL;
90 struct iommu_domain *domain = kvm->arch.iommu_domain;
93 /* check if iommu exists and in use */
97 pdev = assigned_dev->dev;
101 r = iommu_attach_device(domain, &pdev->dev);
103 printk(KERN_ERR "assign device %x:%x.%x failed",
105 PCI_SLOT(pdev->devfn),
106 PCI_FUNC(pdev->devfn));
110 printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n",
111 assigned_dev->host_busnr,
112 PCI_SLOT(assigned_dev->host_devfn),
113 PCI_FUNC(assigned_dev->host_devfn));
118 int kvm_deassign_device(struct kvm *kvm,
119 struct kvm_assigned_dev_kernel *assigned_dev)
121 struct iommu_domain *domain = kvm->arch.iommu_domain;
122 struct pci_dev *pdev = NULL;
124 /* check if iommu exists and in use */
128 pdev = assigned_dev->dev;
132 iommu_detach_device(domain, &pdev->dev);
134 printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n",
135 assigned_dev->host_busnr,
136 PCI_SLOT(assigned_dev->host_devfn),
137 PCI_FUNC(assigned_dev->host_devfn));
142 int kvm_iommu_map_guest(struct kvm *kvm)
146 if (!iommu_found()) {
147 printk(KERN_ERR "%s: iommu not found\n", __func__);
151 kvm->arch.iommu_domain = iommu_domain_alloc();
152 if (!kvm->arch.iommu_domain)
155 r = kvm_iommu_map_memslots(kvm);
162 kvm_iommu_unmap_memslots(kvm);
166 static void kvm_iommu_put_pages(struct kvm *kvm,
167 gfn_t base_gfn, unsigned long npages)
169 gfn_t gfn = base_gfn;
171 struct iommu_domain *domain = kvm->arch.iommu_domain;
175 /* check if iommu exists and in use */
179 for (i = 0; i < npages; i++) {
180 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
181 pfn = phys >> PAGE_SHIFT;
182 kvm_release_pfn_clean(pfn);
186 iommu_unmap_range(domain, gfn_to_gpa(base_gfn), PAGE_SIZE * npages);
189 static int kvm_iommu_unmap_memslots(struct kvm *kvm)
193 for (i = 0; i < kvm->nmemslots; i++) {
194 kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
195 kvm->memslots[i].npages);
201 int kvm_iommu_unmap_guest(struct kvm *kvm)
203 struct iommu_domain *domain = kvm->arch.iommu_domain;
205 /* check if iommu exists and in use */
209 kvm_iommu_unmap_memslots(kvm);
210 iommu_domain_free(domain);