/* * 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 voidkvm_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_MSIstatic 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_MSIXstatic 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_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, 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_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, 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_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; 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; 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);Lines 1–500 of 1023. 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/* * 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(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);