/* * 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 0; } return index;} static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id){ struct kvm_assigned_dev_kernel *assigned_dev = dev_id; if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) { spin_lock(&assigned_dev->intx_lock); disable_irq_nosync(irq); assigned_dev->host_irq_disabled = true; spin_unlock(&assigned_dev->intx_lock); } kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, assigned_dev->guest_irq, 1); return IRQ_HANDLED;} #ifdef __KVM_HAVE_MSIXstatic 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_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, vector, 1); } 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); /* The guest irq may be shared so this ack may be * from another device. */ spin_lock(&dev->intx_lock); if (dev->host_irq_disabled) { enable_irq(dev->host_irq); dev->host_irq_disabled = false; } spin_unlock(&dev->intx_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); 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 */ 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){ dev->host_irq = dev->dev->irq; /* Even though this is PCI, we don't want to use shared * interrupts. Sharing host devices with guest-assigned devices * on the same interrupt line is not a happy situation: there * are going to be long delays in accepting, acking, etc. */ if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread, IRQF_ONESHOT, dev->irq_name, dev)) return -EIO; return 0;} #ifdef __KVM_HAVE_MSIstatic 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, NULL, kvm_assigned_dev_thread, 0, dev->irq_name, dev)) { pci_disable_msi(dev->dev); return -EIO; } return 0;}#endif #ifdef __KVM_HAVE_MSIXstatic 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(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, NULL, 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_MSIstatic 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; dev->host_irq_disabled = false; return 0;}#endif #ifdef __KVM_HAVE_MSIXstatic 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; dev->host_irq_disabled = false; 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; } 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; mutex_lock(&kvm->lock); match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_irq->assigned_dev_id); if (!match) goto out; r = kvm_deassign_irq(kvm, match, assigned_irq->flags);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; Lines 1–500 of 878. Load more
/* * 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 0; } return index; } static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id) { struct kvm_assigned_dev_kernel *assigned_dev = dev_id; if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) { spin_lock(&assigned_dev->intx_lock); disable_irq_nosync(irq); assigned_dev->host_irq_disabled = true; spin_unlock(&assigned_dev->intx_lock); } kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, assigned_dev->guest_irq, 1); return IRQ_HANDLED; } #ifdef __KVM_HAVE_MSIX 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_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, vector, 1); } 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); /* The guest irq may be shared so this ack may be * from another device. */ spin_lock(&dev->intx_lock); if (dev->host_irq_disabled) { enable_irq(dev->host_irq); dev->host_irq_disabled = false; } spin_unlock(&dev->intx_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); 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 */ 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) { dev->host_irq = dev->dev->irq; /* Even though this is PCI, we don't want to use shared * interrupts. Sharing host devices with guest-assigned devices * on the same interrupt line is not a happy situation: there * are going to be long delays in accepting, acking, etc. */ if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread, IRQF_ONESHOT, dev->irq_name, dev)) return -EIO; 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, NULL, kvm_assigned_dev_thread, 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(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, NULL, 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; dev->host_irq_disabled = false; 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; dev->host_irq_disabled = false; 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; } 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; mutex_lock(&kvm->lock); match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, assigned_irq->assigned_dev_id); if (!match) goto out; r = kvm_deassign_irq(kvm, match, assigned_irq->flags); 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;