2 * Kernel-based Virtual Machine - device assignment support
4 * Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
6 * This work is licensed under the terms of the GNU GPL, version 2. See
7 * the COPYING file in the top-level directory.
11 #include <linux/kvm_host.h>
12 #include <linux/kvm.h>
13 #include <linux/uaccess.h>
14 #include <linux/vmalloc.h>
15 #include <linux/errno.h>
16 #include <linux/spinlock.h>
17 #include <linux/pci.h>
18 #include <linux/interrupt.h>
19 #include <linux/slab.h>
20 #include <linux/namei.h>
24 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
27 struct list_head *ptr;
28 struct kvm_assigned_dev_kernel *match;
30 list_for_each(ptr, head) {
31 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
32 if (match->assigned_dev_id == assigned_dev_id)
38 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
39 *assigned_dev, int irq)
42 struct msix_entry *host_msix_entries;
44 host_msix_entries = assigned_dev->host_msix_entries;
47 for (i = 0; i < assigned_dev->entries_nr; i++)
48 if (irq == host_msix_entries[i].vector) {
53 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
58 static irqreturn_t kvm_assigned_dev_intx(int irq, void *dev_id)
60 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
63 spin_lock(&assigned_dev->intx_lock);
64 if (pci_check_and_mask_intx(assigned_dev->dev)) {
65 assigned_dev->host_irq_disabled = true;
66 ret = IRQ_WAKE_THREAD;
69 spin_unlock(&assigned_dev->intx_lock);
75 kvm_assigned_dev_raise_guest_irq(struct kvm_assigned_dev_kernel *assigned_dev,
78 if (unlikely(assigned_dev->irq_requested_type &
79 KVM_DEV_IRQ_GUEST_INTX)) {
80 spin_lock(&assigned_dev->intx_mask_lock);
81 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
82 kvm_set_irq(assigned_dev->kvm,
83 assigned_dev->irq_source_id, vector, 1);
84 spin_unlock(&assigned_dev->intx_mask_lock);
86 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
90 static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id)
92 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
94 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
95 spin_lock_irq(&assigned_dev->intx_lock);
96 disable_irq_nosync(irq);
97 assigned_dev->host_irq_disabled = true;
98 spin_unlock_irq(&assigned_dev->intx_lock);
101 kvm_assigned_dev_raise_guest_irq(assigned_dev,
102 assigned_dev->guest_irq);
107 #ifdef __KVM_HAVE_MSI
108 static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id)
110 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
112 kvm_assigned_dev_raise_guest_irq(assigned_dev,
113 assigned_dev->guest_irq);
119 #ifdef __KVM_HAVE_MSIX
120 static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
122 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
123 int index = find_index_from_host_irq(assigned_dev, irq);
127 vector = assigned_dev->guest_msix_entries[index].vector;
128 kvm_assigned_dev_raise_guest_irq(assigned_dev, vector);
135 /* Ack the irq line for an assigned device */
136 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
138 struct kvm_assigned_dev_kernel *dev =
139 container_of(kian, struct kvm_assigned_dev_kernel,
142 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
144 spin_lock(&dev->intx_mask_lock);
146 if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) {
147 bool reassert = false;
149 spin_lock_irq(&dev->intx_lock);
151 * The guest IRQ may be shared so this ack can come from an
152 * IRQ for another guest device.
154 if (dev->host_irq_disabled) {
155 if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3))
156 enable_irq(dev->host_irq);
157 else if (!pci_check_and_unmask_intx(dev->dev))
159 dev->host_irq_disabled = reassert;
161 spin_unlock_irq(&dev->intx_lock);
164 kvm_set_irq(dev->kvm, dev->irq_source_id,
168 spin_unlock(&dev->intx_mask_lock);
171 static void deassign_guest_irq(struct kvm *kvm,
172 struct kvm_assigned_dev_kernel *assigned_dev)
174 if (assigned_dev->ack_notifier.gsi != -1)
175 kvm_unregister_irq_ack_notifier(kvm,
176 &assigned_dev->ack_notifier);
178 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
179 assigned_dev->guest_irq, 0);
181 if (assigned_dev->irq_source_id != -1)
182 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
183 assigned_dev->irq_source_id = -1;
184 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
187 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
188 static void deassign_host_irq(struct kvm *kvm,
189 struct kvm_assigned_dev_kernel *assigned_dev)
192 * We disable irq here to prevent further events.
194 * Notice this maybe result in nested disable if the interrupt type is
195 * INTx, but it's OK for we are going to free it.
197 * If this function is a part of VM destroy, please ensure that till
198 * now, the kvm state is still legal for probably we also have to wait
199 * on a currently running IRQ handler.
201 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
203 for (i = 0; i < assigned_dev->entries_nr; i++)
204 disable_irq(assigned_dev->host_msix_entries[i].vector);
206 for (i = 0; i < assigned_dev->entries_nr; i++)
207 free_irq(assigned_dev->host_msix_entries[i].vector,
210 assigned_dev->entries_nr = 0;
211 kfree(assigned_dev->host_msix_entries);
212 kfree(assigned_dev->guest_msix_entries);
213 pci_disable_msix(assigned_dev->dev);
215 /* Deal with MSI and INTx */
216 if ((assigned_dev->irq_requested_type &
217 KVM_DEV_IRQ_HOST_INTX) &&
218 (assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
219 spin_lock_irq(&assigned_dev->intx_lock);
220 pci_intx(assigned_dev->dev, false);
221 spin_unlock_irq(&assigned_dev->intx_lock);
222 synchronize_irq(assigned_dev->host_irq);
224 disable_irq(assigned_dev->host_irq);
226 free_irq(assigned_dev->host_irq, assigned_dev);
228 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
229 pci_disable_msi(assigned_dev->dev);
232 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
235 static int kvm_deassign_irq(struct kvm *kvm,
236 struct kvm_assigned_dev_kernel *assigned_dev,
237 unsigned long irq_requested_type)
239 unsigned long guest_irq_type, host_irq_type;
241 if (!irqchip_in_kernel(kvm))
243 /* no irq assignment to deassign */
244 if (!assigned_dev->irq_requested_type)
247 host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
248 guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
251 deassign_host_irq(kvm, assigned_dev);
253 deassign_guest_irq(kvm, assigned_dev);
258 static void kvm_free_assigned_irq(struct kvm *kvm,
259 struct kvm_assigned_dev_kernel *assigned_dev)
261 kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
264 static void kvm_free_assigned_device(struct kvm *kvm,
265 struct kvm_assigned_dev_kernel
268 kvm_free_assigned_irq(kvm, assigned_dev);
270 pci_reset_function(assigned_dev->dev);
271 if (pci_load_and_free_saved_state(assigned_dev->dev,
272 &assigned_dev->pci_saved_state))
273 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
274 __func__, dev_name(&assigned_dev->dev->dev));
276 pci_restore_state(assigned_dev->dev);
278 assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
280 pci_release_regions(assigned_dev->dev);
281 pci_disable_device(assigned_dev->dev);
282 pci_dev_put(assigned_dev->dev);
284 list_del(&assigned_dev->list);
288 void kvm_free_all_assigned_devices(struct kvm *kvm)
290 struct list_head *ptr, *ptr2;
291 struct kvm_assigned_dev_kernel *assigned_dev;
293 list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
294 assigned_dev = list_entry(ptr,
295 struct kvm_assigned_dev_kernel,
298 kvm_free_assigned_device(kvm, assigned_dev);
302 static int assigned_device_enable_host_intx(struct kvm *kvm,
303 struct kvm_assigned_dev_kernel *dev)
305 irq_handler_t irq_handler;
308 dev->host_irq = dev->dev->irq;
311 * We can only share the IRQ line with other host devices if we are
312 * able to disable the IRQ source at device-level - independently of
313 * the guest driver. Otherwise host devices may suffer from unbounded
314 * IRQ latencies when the guest keeps the line asserted.
316 if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
317 irq_handler = kvm_assigned_dev_intx;
321 flags = IRQF_ONESHOT;
323 if (request_threaded_irq(dev->host_irq, irq_handler,
324 kvm_assigned_dev_thread_intx, flags,
328 if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
329 spin_lock_irq(&dev->intx_lock);
330 pci_intx(dev->dev, true);
331 spin_unlock_irq(&dev->intx_lock);
336 #ifdef __KVM_HAVE_MSI
337 static int assigned_device_enable_host_msi(struct kvm *kvm,
338 struct kvm_assigned_dev_kernel *dev)
342 if (!dev->dev->msi_enabled) {
343 r = pci_enable_msi(dev->dev);
348 dev->host_irq = dev->dev->irq;
349 if (request_threaded_irq(dev->host_irq, NULL,
350 kvm_assigned_dev_thread_msi, 0,
351 dev->irq_name, dev)) {
352 pci_disable_msi(dev->dev);
360 #ifdef __KVM_HAVE_MSIX
361 static int assigned_device_enable_host_msix(struct kvm *kvm,
362 struct kvm_assigned_dev_kernel *dev)
366 /* host_msix_entries and guest_msix_entries should have been
368 if (dev->entries_nr == 0)
371 r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
375 for (i = 0; i < dev->entries_nr; i++) {
376 r = request_threaded_irq(dev->host_msix_entries[i].vector,
377 NULL, kvm_assigned_dev_thread_msix,
378 0, dev->irq_name, dev);
385 for (i -= 1; i >= 0; i--)
386 free_irq(dev->host_msix_entries[i].vector, dev);
387 pci_disable_msix(dev->dev);
393 static int assigned_device_enable_guest_intx(struct kvm *kvm,
394 struct kvm_assigned_dev_kernel *dev,
395 struct kvm_assigned_irq *irq)
397 dev->guest_irq = irq->guest_irq;
398 dev->ack_notifier.gsi = irq->guest_irq;
402 #ifdef __KVM_HAVE_MSI
403 static int assigned_device_enable_guest_msi(struct kvm *kvm,
404 struct kvm_assigned_dev_kernel *dev,
405 struct kvm_assigned_irq *irq)
407 dev->guest_irq = irq->guest_irq;
408 dev->ack_notifier.gsi = -1;
413 #ifdef __KVM_HAVE_MSIX
414 static int assigned_device_enable_guest_msix(struct kvm *kvm,
415 struct kvm_assigned_dev_kernel *dev,
416 struct kvm_assigned_irq *irq)
418 dev->guest_irq = irq->guest_irq;
419 dev->ack_notifier.gsi = -1;
424 static int assign_host_irq(struct kvm *kvm,
425 struct kvm_assigned_dev_kernel *dev,
430 if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
433 snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
436 switch (host_irq_type) {
437 case KVM_DEV_IRQ_HOST_INTX:
438 r = assigned_device_enable_host_intx(kvm, dev);
440 #ifdef __KVM_HAVE_MSI
441 case KVM_DEV_IRQ_HOST_MSI:
442 r = assigned_device_enable_host_msi(kvm, dev);
445 #ifdef __KVM_HAVE_MSIX
446 case KVM_DEV_IRQ_HOST_MSIX:
447 r = assigned_device_enable_host_msix(kvm, dev);
453 dev->host_irq_disabled = false;
456 dev->irq_requested_type |= host_irq_type;
461 static int assign_guest_irq(struct kvm *kvm,
462 struct kvm_assigned_dev_kernel *dev,
463 struct kvm_assigned_irq *irq,
464 unsigned long guest_irq_type)
469 if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
472 id = kvm_request_irq_source_id(kvm);
476 dev->irq_source_id = id;
478 switch (guest_irq_type) {
479 case KVM_DEV_IRQ_GUEST_INTX:
480 r = assigned_device_enable_guest_intx(kvm, dev, irq);
482 #ifdef __KVM_HAVE_MSI
483 case KVM_DEV_IRQ_GUEST_MSI:
484 r = assigned_device_enable_guest_msi(kvm, dev, irq);
487 #ifdef __KVM_HAVE_MSIX
488 case KVM_DEV_IRQ_GUEST_MSIX:
489 r = assigned_device_enable_guest_msix(kvm, dev, irq);
497 dev->irq_requested_type |= guest_irq_type;
498 if (dev->ack_notifier.gsi != -1)
499 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
501 kvm_free_irq_source_id(kvm, dev->irq_source_id);
506 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
507 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
508 struct kvm_assigned_irq *assigned_irq)
511 struct kvm_assigned_dev_kernel *match;
512 unsigned long host_irq_type, guest_irq_type;
514 if (!irqchip_in_kernel(kvm))
517 mutex_lock(&kvm->lock);
519 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
520 assigned_irq->assigned_dev_id);
524 host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
525 guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
528 /* can only assign one type at a time */
529 if (hweight_long(host_irq_type) > 1)
531 if (hweight_long(guest_irq_type) > 1)
533 if (host_irq_type == 0 && guest_irq_type == 0)
538 r = assign_host_irq(kvm, match, host_irq_type);
543 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
545 mutex_unlock(&kvm->lock);
549 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
550 struct kvm_assigned_irq
554 struct kvm_assigned_dev_kernel *match;
555 unsigned long irq_type;
557 mutex_lock(&kvm->lock);
559 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
560 assigned_irq->assigned_dev_id);
564 irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
565 KVM_DEV_IRQ_GUEST_MASK);
566 r = kvm_deassign_irq(kvm, match, irq_type);
568 mutex_unlock(&kvm->lock);
573 * We want to test whether the caller has been granted permissions to
574 * use this device. To be able to configure and control the device,
575 * the user needs access to PCI configuration space and BAR resources.
576 * These are accessed through PCI sysfs. PCI config space is often
577 * passed to the process calling this ioctl via file descriptor, so we
578 * can't rely on access to that file. We can check for permissions
579 * on each of the BAR resource files, which is a pretty clear
580 * indicator that the user has been granted access to the device.
582 static int probe_sysfs_permissions(struct pci_dev *dev)
586 bool bar_found = false;
588 for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
589 char *kpath, *syspath;
594 if (!pci_resource_len(dev, i))
597 kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
601 /* Per sysfs-rules, sysfs is always at /sys */
602 syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
607 r = kern_path(syspath, LOOKUP_FOLLOW, &path);
612 inode = path.dentry->d_inode;
614 r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
622 /* If no resources, probably something special */
628 return -EINVAL; /* No way to control the device without sysfs */
632 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
633 struct kvm_assigned_pci_dev *assigned_dev)
636 struct kvm_assigned_dev_kernel *match;
639 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
642 mutex_lock(&kvm->lock);
643 idx = srcu_read_lock(&kvm->srcu);
645 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
646 assigned_dev->assigned_dev_id);
648 /* device already assigned */
653 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
655 printk(KERN_INFO "%s: Couldn't allocate memory\n",
660 dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
662 assigned_dev->devfn);
664 printk(KERN_INFO "%s: host device not found\n", __func__);
669 /* Don't allow bridges to be assigned */
670 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
675 r = probe_sysfs_permissions(dev);
679 if (pci_enable_device(dev)) {
680 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
684 r = pci_request_regions(dev, "kvm_assigned_device");
686 printk(KERN_INFO "%s: Could not get access to device regions\n",
691 pci_reset_function(dev);
693 match->pci_saved_state = pci_store_saved_state(dev);
694 if (!match->pci_saved_state)
695 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
696 __func__, dev_name(&dev->dev));
698 if (!pci_intx_mask_supported(dev))
699 assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
701 match->assigned_dev_id = assigned_dev->assigned_dev_id;
702 match->host_segnr = assigned_dev->segnr;
703 match->host_busnr = assigned_dev->busnr;
704 match->host_devfn = assigned_dev->devfn;
705 match->flags = assigned_dev->flags;
707 spin_lock_init(&match->intx_lock);
708 spin_lock_init(&match->intx_mask_lock);
709 match->irq_source_id = -1;
711 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
713 list_add(&match->list, &kvm->arch.assigned_dev_head);
715 if (!kvm->arch.iommu_domain) {
716 r = kvm_iommu_map_guest(kvm);
720 r = kvm_assign_device(kvm, match);
725 srcu_read_unlock(&kvm->srcu, idx);
726 mutex_unlock(&kvm->lock);
729 if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
730 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
731 __func__, dev_name(&dev->dev));
732 list_del(&match->list);
733 pci_release_regions(dev);
735 pci_disable_device(dev);
740 srcu_read_unlock(&kvm->srcu, idx);
741 mutex_unlock(&kvm->lock);
745 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
746 struct kvm_assigned_pci_dev *assigned_dev)
749 struct kvm_assigned_dev_kernel *match;
751 mutex_lock(&kvm->lock);
753 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
754 assigned_dev->assigned_dev_id);
756 printk(KERN_INFO "%s: device hasn't been assigned before, "
757 "so cannot be deassigned\n", __func__);
762 kvm_deassign_device(kvm, match);
764 kvm_free_assigned_device(kvm, match);
767 mutex_unlock(&kvm->lock);
772 #ifdef __KVM_HAVE_MSIX
773 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
774 struct kvm_assigned_msix_nr *entry_nr)
777 struct kvm_assigned_dev_kernel *adev;
779 mutex_lock(&kvm->lock);
781 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
782 entry_nr->assigned_dev_id);
788 if (adev->entries_nr == 0) {
789 adev->entries_nr = entry_nr->entry_nr;
790 if (adev->entries_nr == 0 ||
791 adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
796 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
799 if (!adev->host_msix_entries) {
803 adev->guest_msix_entries =
804 kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
806 if (!adev->guest_msix_entries) {
807 kfree(adev->host_msix_entries);
811 } else /* Not allowed set MSI-X number twice */
814 mutex_unlock(&kvm->lock);
818 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
819 struct kvm_assigned_msix_entry *entry)
822 struct kvm_assigned_dev_kernel *adev;
824 mutex_lock(&kvm->lock);
826 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
827 entry->assigned_dev_id);
834 for (i = 0; i < adev->entries_nr; i++)
835 if (adev->guest_msix_entries[i].vector == 0 ||
836 adev->guest_msix_entries[i].entry == entry->entry) {
837 adev->guest_msix_entries[i].entry = entry->entry;
838 adev->guest_msix_entries[i].vector = entry->gsi;
839 adev->host_msix_entries[i].entry = entry->entry;
842 if (i == adev->entries_nr) {
848 mutex_unlock(&kvm->lock);
854 static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm,
855 struct kvm_assigned_pci_dev *assigned_dev)
858 struct kvm_assigned_dev_kernel *match;
860 mutex_lock(&kvm->lock);
862 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
863 assigned_dev->assigned_dev_id);
869 spin_lock(&match->intx_mask_lock);
871 match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
872 match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
874 if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
875 if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
876 kvm_set_irq(match->kvm, match->irq_source_id,
877 match->guest_irq, 0);
879 * Masking at hardware-level is performed on demand,
880 * i.e. when an IRQ actually arrives at the host.
882 } else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
884 * Unmask the IRQ line if required. Unmasking at
885 * device level will be performed by user space.
887 spin_lock_irq(&match->intx_lock);
888 if (match->host_irq_disabled) {
889 enable_irq(match->host_irq);
890 match->host_irq_disabled = false;
892 spin_unlock_irq(&match->intx_lock);
896 spin_unlock(&match->intx_mask_lock);
899 mutex_unlock(&kvm->lock);
903 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
906 void __user *argp = (void __user *)arg;
910 case KVM_ASSIGN_PCI_DEVICE: {
911 struct kvm_assigned_pci_dev assigned_dev;
914 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
916 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
921 case KVM_ASSIGN_IRQ: {
925 case KVM_ASSIGN_DEV_IRQ: {
926 struct kvm_assigned_irq assigned_irq;
929 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
931 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
936 case KVM_DEASSIGN_DEV_IRQ: {
937 struct kvm_assigned_irq assigned_irq;
940 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
942 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
947 case KVM_DEASSIGN_PCI_DEVICE: {
948 struct kvm_assigned_pci_dev assigned_dev;
951 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
953 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
958 #ifdef KVM_CAP_IRQ_ROUTING
959 case KVM_SET_GSI_ROUTING: {
960 struct kvm_irq_routing routing;
961 struct kvm_irq_routing __user *urouting;
962 struct kvm_irq_routing_entry *entries;
965 if (copy_from_user(&routing, argp, sizeof(routing)))
968 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
973 entries = vmalloc(routing.nr * sizeof(*entries));
978 if (copy_from_user(entries, urouting->entries,
979 routing.nr * sizeof(*entries)))
980 goto out_free_irq_routing;
981 r = kvm_set_irq_routing(kvm, entries, routing.nr,
983 out_free_irq_routing:
987 #endif /* KVM_CAP_IRQ_ROUTING */
988 #ifdef __KVM_HAVE_MSIX
989 case KVM_ASSIGN_SET_MSIX_NR: {
990 struct kvm_assigned_msix_nr entry_nr;
992 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
994 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
999 case KVM_ASSIGN_SET_MSIX_ENTRY: {
1000 struct kvm_assigned_msix_entry entry;
1002 if (copy_from_user(&entry, argp, sizeof entry))
1004 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
1010 case KVM_ASSIGN_SET_INTX_MASK: {
1011 struct kvm_assigned_pci_dev assigned_dev;
1014 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1016 r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);