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>
34 #include "assigned-dev.h"
36 static bool allow_unsafe_assigned_interrupts;
37 module_param_named(allow_unsafe_assigned_interrupts,
38 allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
39 MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
40 "Enable device assignment on platforms without interrupt remapping support.");
42 static int kvm_iommu_unmap_memslots(struct kvm *kvm);
43 static void kvm_iommu_put_pages(struct kvm *kvm,
44 gfn_t base_gfn, unsigned long npages);
46 static kvm_pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
52 pfn = gfn_to_pfn_memslot(slot, gfn);
53 end_gfn = gfn + npages;
56 if (is_error_noslot_pfn(pfn))
60 gfn_to_pfn_memslot(slot, gfn++);
65 static void kvm_unpin_pages(struct kvm *kvm, kvm_pfn_t pfn,
70 for (i = 0; i < npages; ++i)
71 kvm_release_pfn_clean(pfn + i);
74 int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
79 struct iommu_domain *domain = kvm->arch.iommu_domain;
82 /* check if iommu exists and in use */
87 end_gfn = gfn + slot->npages;
90 if (!(slot->flags & KVM_MEM_READONLY))
92 if (!kvm->arch.iommu_noncoherent)
96 while (gfn < end_gfn) {
97 unsigned long page_size;
99 /* Check if already mapped */
100 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
105 /* Get the page size we could use to map */
106 page_size = kvm_host_page_size(kvm, gfn);
108 /* Make sure the page_size does not exceed the memslot */
109 while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
112 /* Make sure gfn is aligned to the page size we want to map */
113 while ((gfn << PAGE_SHIFT) & (page_size - 1))
116 /* Make sure hva is aligned to the page size we want to map */
117 while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
121 * Pin all pages we are about to map in memory. This is
122 * important because we unmap and unpin in 4kb steps later.
124 pfn = kvm_pin_pages(slot, gfn, page_size >> PAGE_SHIFT);
125 if (is_error_noslot_pfn(pfn)) {
130 /* Map into IO address space */
131 r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
134 printk(KERN_ERR "kvm_iommu_map_address:"
135 "iommu failed to map pfn=%llx\n", pfn);
136 kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT);
140 gfn += page_size >> PAGE_SHIFT;
148 kvm_iommu_put_pages(kvm, slot->base_gfn, gfn - slot->base_gfn);
152 static int kvm_iommu_map_memslots(struct kvm *kvm)
155 struct kvm_memslots *slots;
156 struct kvm_memory_slot *memslot;
158 if (kvm->arch.iommu_noncoherent)
159 kvm_arch_register_noncoherent_dma(kvm);
161 idx = srcu_read_lock(&kvm->srcu);
162 slots = kvm_memslots(kvm);
164 kvm_for_each_memslot(memslot, slots) {
165 r = kvm_iommu_map_pages(kvm, memslot);
169 srcu_read_unlock(&kvm->srcu, idx);
174 int kvm_assign_device(struct kvm *kvm, struct pci_dev *pdev)
176 struct iommu_domain *domain = kvm->arch.iommu_domain;
180 /* check if iommu exists and in use */
187 r = iommu_attach_device(domain, &pdev->dev);
189 dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
193 noncoherent = !iommu_capable(&pci_bus_type, IOMMU_CAP_CACHE_COHERENCY);
195 /* Check if need to update IOMMU page table for guest memory */
196 if (noncoherent != kvm->arch.iommu_noncoherent) {
197 kvm_iommu_unmap_memslots(kvm);
198 kvm->arch.iommu_noncoherent = noncoherent;
199 r = kvm_iommu_map_memslots(kvm);
204 kvm_arch_start_assignment(kvm);
205 pci_set_dev_assigned(pdev);
207 dev_info(&pdev->dev, "kvm assign device\n");
211 kvm_iommu_unmap_memslots(kvm);
215 int kvm_deassign_device(struct kvm *kvm, struct pci_dev *pdev)
217 struct iommu_domain *domain = kvm->arch.iommu_domain;
219 /* check if iommu exists and in use */
226 iommu_detach_device(domain, &pdev->dev);
228 pci_clear_dev_assigned(pdev);
229 kvm_arch_end_assignment(kvm);
231 dev_info(&pdev->dev, "kvm deassign device\n");
236 int kvm_iommu_map_guest(struct kvm *kvm)
240 if (!iommu_present(&pci_bus_type)) {
241 printk(KERN_ERR "%s: iommu not found\n", __func__);
245 mutex_lock(&kvm->slots_lock);
247 kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
248 if (!kvm->arch.iommu_domain) {
253 if (!allow_unsafe_assigned_interrupts &&
254 !iommu_capable(&pci_bus_type, IOMMU_CAP_INTR_REMAP)) {
255 printk(KERN_WARNING "%s: No interrupt remapping support,"
256 " disallowing device assignment."
257 " Re-enble with \"allow_unsafe_assigned_interrupts=1\""
258 " module option.\n", __func__);
259 iommu_domain_free(kvm->arch.iommu_domain);
260 kvm->arch.iommu_domain = NULL;
265 r = kvm_iommu_map_memslots(kvm);
267 kvm_iommu_unmap_memslots(kvm);
270 mutex_unlock(&kvm->slots_lock);
274 static void kvm_iommu_put_pages(struct kvm *kvm,
275 gfn_t base_gfn, unsigned long npages)
277 struct iommu_domain *domain;
282 domain = kvm->arch.iommu_domain;
283 end_gfn = base_gfn + npages;
286 /* check if iommu exists and in use */
290 while (gfn < end_gfn) {
291 unsigned long unmap_pages;
294 /* Get physical address */
295 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
302 pfn = phys >> PAGE_SHIFT;
304 /* Unmap address from IO address space */
305 size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
306 unmap_pages = 1ULL << get_order(size);
308 /* Unpin all pages we just unmapped to not leak any memory */
309 kvm_unpin_pages(kvm, pfn, unmap_pages);
317 void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
319 kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
322 static int kvm_iommu_unmap_memslots(struct kvm *kvm)
325 struct kvm_memslots *slots;
326 struct kvm_memory_slot *memslot;
328 idx = srcu_read_lock(&kvm->srcu);
329 slots = kvm_memslots(kvm);
331 kvm_for_each_memslot(memslot, slots)
332 kvm_iommu_unmap_pages(kvm, memslot);
334 srcu_read_unlock(&kvm->srcu, idx);
336 if (kvm->arch.iommu_noncoherent)
337 kvm_arch_unregister_noncoherent_dma(kvm);
342 int kvm_iommu_unmap_guest(struct kvm *kvm)
344 struct iommu_domain *domain = kvm->arch.iommu_domain;
346 /* check if iommu exists and in use */
350 mutex_lock(&kvm->slots_lock);
351 kvm_iommu_unmap_memslots(kvm);
352 kvm->arch.iommu_domain = NULL;
353 kvm->arch.iommu_noncoherent = false;
354 mutex_unlock(&kvm->slots_lock);
356 iommu_domain_free(domain);