/* * Kernel-based Virtual Machine - device assignment support * * Copyright (C) 2010 Red Hat, Inc. and/or its affiliates. * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include <linux/kvm_host.h> #include <linux/kvm.h> #include <linux/uaccess.h> #include <linux/vmalloc.h> #include <linux/errno.h> #include <linux/spinlock.h> #include <linux/pci.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/namei.h> #include <linux/fs.h> #include "irq.h" static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head, int assigned_dev_id) { struct list_head *ptr; struct kvm_assigned_dev_kernel *match; list_for_each(ptr, head) { match = list_entry(ptr, struct kvm_assigned_dev_kernel, list); if (match->assigned_dev_id == assigned_dev_id) return match; } return NULL; } static int find_index_from_host_irq(struct kvm_assigned_dev_kernel *assigned_dev, int irq) { int i, index; struct msix_entry *host_msix_entries; host_msix_entries = assigned_dev->host_msix_entries; index = -1; for (i = 0; i < assigned_dev->entries_nr; i++) if (irq == host_msix_entries[i].vector) { index = i; break; } if (index < 0) printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n"); return index; } static irqreturn_t kvm_assigned_dev_intx(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; int ret; spin_lock(&assigned_dev->intx_lock); if (pci_check_and_mask_intx(assigned_dev->dev)) { assigned_dev->host_irq_disabled = true; ret = IRQ_WAKE_THREAD; } else ret = IRQ_NONE; spin_unlock(&assigned_dev->intx_lock); return ret; } static void kvm_assigned_dev_raise_guest_irq(struct kvm_assigned_dev_kernel *assigned_dev, int vector) { if (unlikely(assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX)) { spin_lock(&assigned_dev->intx_mask_lock); if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, vector, 1, false); spin_unlock(&assigned_dev->intx_mask_lock); } else kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, vector, 1, false); } static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) { spin_lock_irq(&assigned_dev->intx_lock); disable_irq_nosync(irq); assigned_dev->host_irq_disabled = true; spin_unlock_irq(&assigned_dev->intx_lock); } kvm_assigned_dev_raise_guest_irq(assigned_dev, assigned_dev->guest_irq); return IRQ_HANDLED; } #ifdef __KVM_HAVE_MSI static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; int ret = kvm_set_irq_inatomic(assigned_dev->kvm, assigned_dev->irq_source_id, assigned_dev->guest_irq, 1); return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED; } static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; kvm_assigned_dev_raise_guest_irq(assigned_dev, assigned_dev->guest_irq); return IRQ_HANDLED; } #endif #ifdef __KVM_HAVE_MSIX static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; int index = find_index_from_host_irq(assigned_dev, irq); u32 vector; int ret = 0; if (index >= 0) { vector = assigned_dev->guest_msix_entries[index].vector; ret = kvm_set_irq_inatomic(assigned_dev->kvm, assigned_dev->irq_source_id, vector, 1); } return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED; } static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; int index = find_index_from_host_irq(assigned_dev, irq); u32 vector; if (index >= 0) { vector = assigned_dev->guest_msix_entries[index].vector; kvm_assigned_dev_raise_guest_irq(assigned_dev, vector); } return IRQ_HANDLED; } #endif /* Ack the irq line for an assigned device */ static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian) { struct kvm_assigned_dev_kernel *dev = container_of(kian, struct kvm_assigned_dev_kernel, ack_notifier); kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0, false); spin_lock(&dev->intx_mask_lock); if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) { bool reassert = false; spin_lock_irq(&dev->intx_lock); /* * The guest IRQ may be shared so this ack can come from an * IRQ for another guest device. */ if (dev->host_irq_disabled) { if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) enable_irq(dev->host_irq); else if (!pci_check_and_unmask_intx(dev->dev)) reassert = true; dev->host_irq_disabled = reassert; } spin_unlock_irq(&dev->intx_lock); if (reassert) kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 1, false); } spin_unlock(&dev->intx_mask_lock); } static void deassign_guest_irq(struct kvm *kvm, struct kvm_assigned_dev_kernel *assigned_dev) { if (assigned_dev->ack_notifier.gsi != -1) kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier); kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, assigned_dev->guest_irq, 0, false); if (assigned_dev->irq_source_id != -1) kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id); assigned_dev->irq_source_id = -1; assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK); } /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */ static void deassign_host_irq(struct kvm *kvm, struct kvm_assigned_dev_kernel *assigned_dev) { /* * We disable irq here to prevent further events. * * Notice this maybe result in nested disable if the interrupt type is * INTx, but it's OK for we are going to free it. * * If this function is a part of VM destroy, please ensure that till * now, the kvm state is still legal for probably we also have to wait * on a currently running IRQ handler. */ if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) { int i; for (i = 0; i < assigned_dev->entries_nr; i++) disable_irq(assigned_dev->host_msix_entries[i].vector); for (i = 0; i < assigned_dev->entries_nr; i++) free_irq(assigned_dev->host_msix_entries[i].vector, assigned_dev); assigned_dev->entries_nr = 0; kfree(assigned_dev->host_msix_entries); kfree(assigned_dev->guest_msix_entries); pci_disable_msix(assigned_dev->dev); } else { /* Deal with MSI and INTx */ if ((assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) && (assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) { spin_lock_irq(&assigned_dev->intx_lock); pci_intx(assigned_dev->dev, false); spin_unlock_irq(&assigned_dev->intx_lock); synchronize_irq(assigned_dev->host_irq); } else disable_irq(assigned_dev->host_irq); free_irq(assigned_dev->host_irq, assigned_dev); if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI) pci_disable_msi(assigned_dev->dev); } assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK); } static int kvm_deassign_irq(struct kvm *kvm, struct kvm_assigned_dev_kernel *assigned_dev, unsigned long irq_requested_type) { unsigned long guest_irq_type, host_irq_type; if (!irqchip_in_kernel(kvm)) return -EINVAL; /* no irq assignment to deassign */ if (!assigned_dev->irq_requested_type) return -ENXIO; host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK; guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK; if (host_irq_type) deassign_host_irq(kvm, assigned_dev); if (guest_irq_type) deassign_guest_irq(kvm, assigned_dev); return 0; } static void kvm_free_assigned_irq(struct kvm *kvm, struct kvm_assigned_dev_kernel *assigned_dev) { kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type); } static void kvm_free_assigned_device(struct kvm *kvm, struct kvm_assigned_dev_kernel *assigned_dev) { kvm_free_assigned_irq(kvm, assigned_dev); pci_reset_function(assigned_dev->dev); if (pci_load_and_free_saved_state(assigned_dev->dev, &assigned_dev->pci_saved_state)) printk(KERN_INFO "%s: Couldn't reload %s saved state\n", __func__, dev_name(&assigned_dev->dev->dev)); else pci_restore_state(assigned_dev->dev); assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; pci_release_regions(assigned_dev->dev); pci_disable_device(assigned_dev->dev); pci_dev_put(assigned_dev->dev); list_del(&assigned_dev->list); kfree(assigned_dev); } void kvm_free_all_assigned_devices(struct kvm *kvm) { struct list_head *ptr, *ptr2; struct kvm_assigned_dev_kernel *assigned_dev; list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) { assigned_dev = list_entry(ptr, struct kvm_assigned_dev_kernel, list); kvm_free_assigned_device(kvm, assigned_dev); } } static int assigned_device_enable_host_intx(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev) { irq_handler_t irq_handler; unsigned long flags; dev->host_irq = dev->dev->irq; /* * We can only share the IRQ line with other host devices if we are * able to disable the IRQ source at device-level - independently of * the guest driver. Otherwise host devices may suffer from unbounded * IRQ latencies when the guest keeps the line asserted. */ if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) { irq_handler = kvm_assigned_dev_intx; flags = IRQF_SHARED; } else { irq_handler = NULL; flags = IRQF_ONESHOT; } if (request_threaded_irq(dev->host_irq, irq_handler, kvm_assigned_dev_thread_intx, flags, dev->irq_name, dev)) return -EIO; if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) { spin_lock_irq(&dev->intx_lock); pci_intx(dev->dev, true); spin_unlock_irq(&dev->intx_lock); } return 0; } #ifdef __KVM_HAVE_MSI static int assigned_device_enable_host_msi(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev) { int r; if (!dev->dev->msi_enabled) { r = pci_enable_msi(dev->dev); if (r) return r; } dev->host_irq = dev->dev->irq; if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi, kvm_assigned_dev_thread_msi, 0, dev->irq_name, dev)) { pci_disable_msi(dev->dev); return -EIO; } return 0; } #endif #ifdef __KVM_HAVE_MSIX static int assigned_device_enable_host_msix(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev) { int i, r = -EINVAL; /* host_msix_entries and guest_msix_entries should have been * initialized */ if (dev->entries_nr == 0) return r; r = pci_enable_msix_exact(dev->dev, dev->host_msix_entries, dev->entries_nr); if (r) return r; for (i = 0; i < dev->entries_nr; i++) { r = request_threaded_irq(dev->host_msix_entries[i].vector, kvm_assigned_dev_msix, kvm_assigned_dev_thread_msix, 0, dev->irq_name, dev); if (r) goto err; } return 0; err: for (i -= 1; i >= 0; i--) free_irq(dev->host_msix_entries[i].vector, dev); pci_disable_msix(dev->dev); return r; } #endif static int assigned_device_enable_guest_intx(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, struct kvm_assigned_irq *irq) { dev->guest_irq = irq->guest_irq; dev->ack_notifier.gsi = irq->guest_irq; return 0; } #ifdef __KVM_HAVE_MSI static int assigned_device_enable_guest_msi(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, struct kvm_assigned_irq *irq) { dev->guest_irq = irq->guest_irq; dev->ack_notifier.gsi = -1; return 0; } #endif #ifdef __KVM_HAVE_MSIX static int assigned_device_enable_guest_msix(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, struct kvm_assigned_irq *irq) { dev->guest_irq = irq->guest_irq; dev->ack_notifier.gsi = -1; return 0; } #endif static int assign_host_irq(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, __u32 host_irq_type) { int r = -EEXIST; if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK) return r; snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s", pci_name(dev->dev)); switch (host_irq_type) { case KVM_DEV_IRQ_HOST_INTX: r = assigned_device_enable_host_intx(kvm, dev); break; #ifdef __KVM_HAVE_MSI case KVM_DEV_IRQ_HOST_MSI: r = assigned_device_enable_host_msi(kvm, dev); break; #endif #ifdef __KVM_HAVE_MSIX case KVM_DEV_IRQ_HOST_MSIX: r = assigned_device_enable_host_msix(kvm, dev); break; #endif default: r = -EINVAL; } dev->host_irq_disabled = false; if (!r) dev->irq_requested_type |= host_irq_type; return r; } static int assign_guest_irq(struct kvm *kvm, struct kvm_assigned_dev_kernel *dev, struct kvm_assigned_irq *irq, unsigned long guest_irq_type) { int id; int r = -EEXIST; if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK) return r; id = kvm_request_irq_source_id(kvm); if (id < 0) return id; dev->irq_source_id = id; switch (guest_irq_type) { case KVM_DEV_IRQ_GUEST_INTX: r = assigned_device_enable_guest_intx(kvm, dev, irq); break; #ifdef __KVM_HAVE_MSI case KVM_DEV_IRQ_GUEST_MSI: r = assigned_device_enable_guest_msi(kvm, dev, irq); break; #endif #ifdef __KVM_HAVE_MSIX case KVM_DEV_IRQ_GUEST_MSIX: r = assigned_device_enable_guest_msix(kvm, dev, irq); break; #endif default: r = -EINVAL; } if (!r) { dev->irq_requested_type |= guest_irq_type; if (dev->ack_notifier.gsi != -1) kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier); } else kvm_free_irq_source_id(kvm, dev->irq_source_id); return r; } /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm, struct kvm_assigned_irq *assigned_irq) { int r = -EINVAL; struct kvm_assigned_dev_kernel *match; unsigned long host_irq_type, guest_irq_type; if (!irqchip_in_kernel(kvm)) return r; mutex_lock(&kvm->lock); r = -ENODEV; match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_irq->assigned_dev_id); if (!match) goto out; host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK); guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK); r = -EINVAL; /* can only assign one type at a time */ if (hweight_long(host_irq_type) > 1) goto out; if (hweight_long(guest_irq_type) > 1) goto out; if (host_irq_type == 0 && guest_irq_type == 0) goto out; r = 0; if (host_irq_type) r = assign_host_irq(kvm, match, host_irq_type); if (r) goto out; if (guest_irq_type) r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type); out: mutex_unlock(&kvm->lock); return r; } static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm, struct kvm_assigned_irq *assigned_irq) { int r = -ENODEV; struct kvm_assigned_dev_kernel *match; unsigned long irq_type; mutex_lock(&kvm->lock); match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_irq->assigned_dev_id); if (!match) goto out; irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK | KVM_DEV_IRQ_GUEST_MASK); r = kvm_deassign_irq(kvm, match, irq_type); out: mutex_unlock(&kvm->lock); return r; } /* * We want to test whether the caller has been granted permissions to * use this device. To be able to configure and control the device, * the user needs access to PCI configuration space and BAR resources. * These are accessed through PCI sysfs. PCI config space is often * passed to the process calling this ioctl via file descriptor, so we * can't rely on access to that file. We can check for permissions * on each of the BAR resource files, which is a pretty clear * indicator that the user has been granted access to the device. */ static int probe_sysfs_permissions(struct pci_dev *dev) { #ifdef CONFIG_SYSFS int i; bool bar_found = false; for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) { char *kpath, *syspath; struct path path; struct inode *inode; int r; if (!pci_resource_len(dev, i)) continue; kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); if (!kpath) return -ENOMEM; /* Per sysfs-rules, sysfs is always at /sys */ syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i); kfree(kpath); if (!syspath) return -ENOMEM; r = kern_path(syspath, LOOKUP_FOLLOW, &path); kfree(syspath); if (r) return r; inode = path.dentry->d_inode; r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS); path_put(&path); if (r) return r; bar_found = true; } /* If no resources, probably something special */ if (!bar_found) return -EPERM; return 0; #else return -EINVAL; /* No way to control the device without sysfs */ #endif } static int kvm_vm_ioctl_assign_device(struct kvm *kvm, struct kvm_assigned_pci_dev *assigned_dev) { int r = 0, idx; struct kvm_assigned_dev_kernel *match; struct pci_dev *dev; if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)) return -EINVAL; mutex_lock(&kvm->lock); idx = srcu_read_lock(&kvm->srcu); match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_dev->assigned_dev_id); if (match) { /* device already assigned */ r = -EEXIST; goto out; } match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL); if (match == NULL) { printk(KERN_INFO "%s: Couldn't allocate memory\n", __func__); r = -ENOMEM; goto out; } dev = pci_get_domain_bus_and_slot(assigned_dev->segnr, assigned_dev->busnr, assigned_dev->devfn); if (!dev) { printk(KERN_INFO "%s: host device not found\n", __func__); r = -EINVAL; goto out_free; } /* Don't allow bridges to be assigned */ if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) { r = -EPERM; goto out_put; } r = probe_sysfs_permissions(dev); if (r) goto out_put; if (pci_enable_device(dev)) { printk(KERN_INFO "%s: Could not enable PCI device\n", __func__); r = -EBUSY; goto out_put; } r = pci_request_regions(dev, "kvm_assigned_device"); if (r) { printk(KERN_INFO "%s: Could not get access to device regions\n", __func__); goto out_disable; } pci_reset_function(dev); pci_save_state(dev); match->pci_saved_state = pci_store_saved_state(dev); if (!match->pci_saved_state) printk(KERN_DEBUG "%s: Couldn't store %s saved state\n", __func__, dev_name(&dev->dev)); if (!pci_intx_mask_supported(dev)) assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3; match->assigned_dev_id = assigned_dev->assigned_dev_id; match->host_segnr = assigned_dev->segnr; match->host_busnr = assigned_dev->busnr; match->host_devfn = assigned_dev->devfn; match->flags = assigned_dev->flags; match->dev = dev; spin_lock_init(&match->intx_lock); spin_lock_init(&match->intx_mask_lock); match->irq_source_id = -1; match->kvm = kvm; match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq; list_add(&match->list, &kvm->arch.assigned_dev_head); if (!kvm->arch.iommu_domain) { r = kvm_iommu_map_guest(kvm); if (r) goto out_list_del; } r = kvm_assign_device(kvm, match); if (r) goto out_list_del; out: srcu_read_unlock(&kvm->srcu, idx); mutex_unlock(&kvm->lock); return r; out_list_del: if (pci_load_and_free_saved_state(dev, &match->pci_saved_state)) printk(KERN_INFO "%s: Couldn't reload %s saved state\n", __func__, dev_name(&dev->dev)); list_del(&match->list); pci_release_regions(dev); out_disable: pci_disable_device(dev); out_put: pci_dev_put(dev); out_free: kfree(match); srcu_read_unlock(&kvm->srcu, idx); mutex_unlock(&kvm->lock); return r; } static int kvm_vm_ioctl_deassign_device(struct kvm *kvm, struct kvm_assigned_pci_dev *assigned_dev) { int r = 0; struct kvm_assigned_dev_kernel *match; mutex_lock(&kvm->lock); match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_dev->assigned_dev_id); if (!match) { printk(KERN_INFO "%s: device hasn't been assigned before, " "so cannot be deassigned\n", __func__); r = -EINVAL; goto out; } kvm_deassign_device(kvm, match); kvm_free_assigned_device(kvm, match); out: mutex_unlock(&kvm->lock); return r; } #ifdef __KVM_HAVE_MSIX static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm, struct kvm_assigned_msix_nr *entry_nr) { int r = 0; struct kvm_assigned_dev_kernel *adev; mutex_lock(&kvm->lock); adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, entry_nr->assigned_dev_id); if (!adev) { r = -EINVAL; goto msix_nr_out; } if (adev->entries_nr == 0) { adev->entries_nr = entry_nr->entry_nr; if (adev->entries_nr == 0 || adev->entries_nr > KVM_MAX_MSIX_PER_DEV) { r = -EINVAL; goto msix_nr_out; } adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr, GFP_KERNEL); if (!adev->host_msix_entries) { r = -ENOMEM; goto msix_nr_out; } adev->guest_msix_entries = kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr, GFP_KERNEL); if (!adev->guest_msix_entries) { kfree(adev->host_msix_entries); r = -ENOMEM; goto msix_nr_out; } } else /* Not allowed set MSI-X number twice */ r = -EINVAL; msix_nr_out: mutex_unlock(&kvm->lock); return r; } static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm, struct kvm_assigned_msix_entry *entry) { int r = 0, i; struct kvm_assigned_dev_kernel *adev; mutex_lock(&kvm->lock); adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, entry->assigned_dev_id); if (!adev) { r = -EINVAL; goto msix_entry_out; } for (i = 0; i < adev->entries_nr; i++) if (adev->guest_msix_entries[i].vector == 0 || adev->guest_msix_entries[i].entry == entry->entry) { adev->guest_msix_entries[i].entry = entry->entry; adev->guest_msix_entries[i].vector = entry->gsi; adev->host_msix_entries[i].entry = entry->entry; break; } if (i == adev->entries_nr) { r = -ENOSPC; goto msix_entry_out; } msix_entry_out: mutex_unlock(&kvm->lock); return r; } #endif static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm, struct kvm_assigned_pci_dev *assigned_dev) { int r = 0; struct kvm_assigned_dev_kernel *match; mutex_lock(&kvm->lock); match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_dev->assigned_dev_id); if (!match) { r = -ENODEV; goto out; } spin_lock(&match->intx_mask_lock); match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX; match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX; if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) { if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) { kvm_set_irq(match->kvm, match->irq_source_id, match->guest_irq, 0, false); /* * Masking at hardware-level is performed on demand, * i.e. when an IRQ actually arrives at the host. */ } else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) { /* * Unmask the IRQ line if required. Unmasking at * device level will be performed by user space. */ spin_lock_irq(&match->intx_lock); if (match->host_irq_disabled) { enable_irq(match->host_irq); match->host_irq_disabled = false; } spin_unlock_irq(&match->intx_lock); } } spin_unlock(&match->intx_mask_lock); out: mutex_unlock(&kvm->lock); return r; } long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl, unsigned long arg) { void __user *argp = (void __user *)arg; int r; switch (ioctl) { case KVM_ASSIGN_PCI_DEVICE: { struct kvm_assigned_pci_dev assigned_dev; r = -EFAULT; if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) goto out; r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev); if (r) goto out; break; } case KVM_ASSIGN_IRQ: { r = -EOPNOTSUPP; break; } case KVM_ASSIGN_DEV_IRQ: { struct kvm_assigned_irq assigned_irq; r = -EFAULT; if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq)) goto out; r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq); if (r) goto out; break; } case KVM_DEASSIGN_DEV_IRQ: { struct kvm_assigned_irq assigned_irq; r = -EFAULT; if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq)) goto out; r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq); if (r) goto out; break; } case KVM_DEASSIGN_PCI_DEVICE: { struct kvm_assigned_pci_dev assigned_dev; r = -EFAULT; if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) goto out; r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev); if (r) goto out; break; } #ifdef __KVM_HAVE_MSIX case KVM_ASSIGN_SET_MSIX_NR: { struct kvm_assigned_msix_nr entry_nr; r = -EFAULT; if (copy_from_user(&entry_nr, argp, sizeof entry_nr)) goto out; r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr); if (r) goto out; break; } case KVM_ASSIGN_SET_MSIX_ENTRY: { struct kvm_assigned_msix_entry entry; r = -EFAULT; if (copy_from_user(&entry, argp, sizeof entry)) goto out; r = kvm_vm_ioctl_set_msix_entry(kvm, &entry); if (r) goto out; break; } #endif case KVM_ASSIGN_SET_INTX_MASK: { struct kvm_assigned_pci_dev assigned_dev; r = -EFAULT; if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) goto out; r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev); break; } default: r = -ENOTTY; break; } out: return r; }