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   1 /*
   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
  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>
  22  */
  23
  24 #include <linux/list.h>
  25 #include <linux/kvm_host.h>
  26 #include <linux/pci.h>
  27 #include <linux/dmar.h>
  28 #include <linux/intel-iommu.h>
  29
  30 static int kvm_iommu_unmap_memslots(struct kvm *kvm);
  31 static void kvm_iommu_put_pages(struct kvm *kvm,
  32                                 gfn_t base_gfn, unsigned long npages);
  33
  34 int kvm_iommu_map_pages(struct kvm *kvm,
  35                         gfn_t base_gfn, unsigned long npages)
  36 {
  37         gfn_t gfn = base_gfn;
  38         pfn_t pfn;
  39         int i, r;
  40         struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
  41
  42         /* check if iommu exists and in use */
  43         if (!domain)
  44                 return 0;
  45
  46         r = -EINVAL;
  47         for (i = 0; i < npages; i++) {
  48                 /* check if already mapped */
  49                 pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
  50                                                      gfn_to_gpa(gfn));
  51                 if (pfn && !is_mmio_pfn(pfn))
  52                         continue;
  53
  54                 pfn = gfn_to_pfn(kvm, gfn);
  55                 if (!is_mmio_pfn(pfn)) {
  56                         r = intel_iommu_page_mapping(domain,
  57                                                      gfn_to_gpa(gfn),
  58                                                      pfn_to_hpa(pfn),
  59                                                      PAGE_SIZE,
  60                                                      DMA_PTE_READ |
  61                                                      DMA_PTE_WRITE);
  62                         if (r) {
  63                                 printk(KERN_DEBUG "kvm_iommu_map_pages:"
  64                                        "iommu failed to map pfn=%lx\n", pfn);
  65                                 goto unmap_pages;
  66                         }
  67                 } else {
  68                         printk(KERN_DEBUG "kvm_iommu_map_page:"
  69                                "invalid pfn=%lx\n", pfn);
  70                         goto unmap_pages;
  71                 }
  72                 gfn++;
  73         }
  74         return 0;
  75
  76 unmap_pages:
  77         kvm_iommu_put_pages(kvm, base_gfn, i);
  78         return r;
  79 }
  80
  81 static int kvm_iommu_map_memslots(struct kvm *kvm)
  82 {
  83         int i, r;
  84
  85         down_read(&kvm->slots_lock);
  86         for (i = 0; i < kvm->nmemslots; i++) {
  87                 r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
  88                                         kvm->memslots[i].npages);
  89                 if (r)
  90                         break;
  91         }
  92         up_read(&kvm->slots_lock);
  93         return r;
  94 }
  95
  96 int kvm_iommu_map_guest(struct kvm *kvm,
  97                         struct kvm_assigned_dev_kernel *assigned_dev)
  98 {
  99         struct pci_dev *pdev = NULL;
 100         int r;
 101
 102         if (!intel_iommu_found()) {
 103                 printk(KERN_ERR "%s: intel iommu not found\n", __func__);
 104                 return -ENODEV;
 105         }
 106
 107         printk(KERN_DEBUG "VT-d direct map: host bdf = %x:%x:%x\n",
 108                assigned_dev->host_busnr,
 109                PCI_SLOT(assigned_dev->host_devfn),
 110                PCI_FUNC(assigned_dev->host_devfn));
 111
 112         pdev = assigned_dev->dev;
 113
 114         if (pdev == NULL) {
 115                 if (kvm->arch.intel_iommu_domain) {
 116                         intel_iommu_domain_exit(kvm->arch.intel_iommu_domain);
 117                         kvm->arch.intel_iommu_domain = NULL;
 118                 }
 119                 return -ENODEV;
 120         }
 121
 122         kvm->arch.intel_iommu_domain = intel_iommu_domain_alloc(pdev);
 123         if (!kvm->arch.intel_iommu_domain)
 124                 return -ENODEV;
 125
 126         r = kvm_iommu_map_memslots(kvm);
 127         if (r)
 128                 goto out_unmap;
 129
 130         intel_iommu_detach_dev(kvm->arch.intel_iommu_domain,
 131                                pdev->bus->number, pdev->devfn);
 132
 133         r = intel_iommu_context_mapping(kvm->arch.intel_iommu_domain,
 134                                         pdev);
 135         if (r) {
 136                 printk(KERN_ERR "Domain context map for %s failed",
 137                        pci_name(pdev));
 138                 goto out_unmap;
 139         }
 140         return 0;
 141
 142 out_unmap:
 143         kvm_iommu_unmap_memslots(kvm);
 144         return r;
 145 }
 146
 147 static void kvm_iommu_put_pages(struct kvm *kvm,
 148                                gfn_t base_gfn, unsigned long npages)
 149 {
 150         gfn_t gfn = base_gfn;
 151         pfn_t pfn;
 152         struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
 153         int i;
 154
 155         for (i = 0; i < npages; i++) {
 156                 pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
 157                                                      gfn_to_gpa(gfn));
 158                 kvm_release_pfn_clean(pfn);
 159                 gfn++;
 160         }
 161 }
 162
 163 static int kvm_iommu_unmap_memslots(struct kvm *kvm)
 164 {
 165         int i;
 166         down_read(&kvm->slots_lock);
 167         for (i = 0; i < kvm->nmemslots; i++) {
 168                 kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
 169                                     kvm->memslots[i].npages);
 170         }
 171         up_read(&kvm->slots_lock);
 172
 173         return 0;
 174 }
 175
 176 int kvm_iommu_unmap_guest(struct kvm *kvm)
 177 {
 178         struct kvm_assigned_dev_kernel *entry;
 179         struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
 180
 181         /* check if iommu exists and in use */
 182         if (!domain)
 183                 return 0;
 184
 185         list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) {
 186                 printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
 187                        entry->host_busnr,
 188                        PCI_SLOT(entry->host_devfn),
 189                        PCI_FUNC(entry->host_devfn));
 190
 191                 /* detach kvm dmar domain */
 192                 intel_iommu_detach_dev(domain, entry->host_busnr,
 193                                        entry->host_devfn);
 194         }
 195         kvm_iommu_unmap_memslots(kvm);
 196         intel_iommu_domain_exit(domain);
 197         return 0;
 198 }