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![Alex Williamson](/assets/img/avatar_default.png)
Only allow KVM device assignment to attach to devices which: - Are not bridges - Have BAR resources (assume others are special devices) - The user has permissions to use Assigning a bridge is a configuration error, it's not supported, and typically doesn't result in the behavior the user is expecting anyway. Devices without BAR resources are typically chipset components that also don't have host drivers. We don't want users to hold such devices captive or cause system problems by fencing them off into an iommu domain. We determine "permission to use" by testing whether the user has access to the PCI sysfs resource files. By default a normal user will not have access to these files, so it provides a good indication that an administration agent has granted the user access to the device. [Yang Bai: add missing #include] [avi: fix comment style] Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Yang Bai <hamo.by@gmail.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
878 lines
21 KiB
C
878 lines
21 KiB
C
/*
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* Kernel-based Virtual Machine - device assignment support
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*
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* Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include <linux/kvm_host.h>
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#include <linux/kvm.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <linux/errno.h>
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#include <linux/spinlock.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/fs.h>
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#include "irq.h"
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static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
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int assigned_dev_id)
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{
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struct list_head *ptr;
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struct kvm_assigned_dev_kernel *match;
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list_for_each(ptr, head) {
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match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
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if (match->assigned_dev_id == assigned_dev_id)
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return match;
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}
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return NULL;
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}
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static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
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*assigned_dev, int irq)
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{
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int i, index;
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struct msix_entry *host_msix_entries;
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host_msix_entries = assigned_dev->host_msix_entries;
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index = -1;
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for (i = 0; i < assigned_dev->entries_nr; i++)
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if (irq == host_msix_entries[i].vector) {
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index = i;
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break;
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}
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if (index < 0) {
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printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
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return 0;
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}
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return index;
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}
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static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
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if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
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spin_lock(&assigned_dev->intx_lock);
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disable_irq_nosync(irq);
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assigned_dev->host_irq_disabled = true;
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spin_unlock(&assigned_dev->intx_lock);
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}
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kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
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assigned_dev->guest_irq, 1);
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return IRQ_HANDLED;
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}
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#ifdef __KVM_HAVE_MSIX
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static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
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int index = find_index_from_host_irq(assigned_dev, irq);
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u32 vector;
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if (index >= 0) {
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vector = assigned_dev->guest_msix_entries[index].vector;
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kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
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vector, 1);
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}
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return IRQ_HANDLED;
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}
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#endif
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/* Ack the irq line for an assigned device */
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static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
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{
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struct kvm_assigned_dev_kernel *dev =
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container_of(kian, struct kvm_assigned_dev_kernel,
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ack_notifier);
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kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
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/* The guest irq may be shared so this ack may be
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* from another device.
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*/
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spin_lock(&dev->intx_lock);
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if (dev->host_irq_disabled) {
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enable_irq(dev->host_irq);
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dev->host_irq_disabled = false;
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}
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spin_unlock(&dev->intx_lock);
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}
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static void deassign_guest_irq(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *assigned_dev)
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{
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if (assigned_dev->ack_notifier.gsi != -1)
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kvm_unregister_irq_ack_notifier(kvm,
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&assigned_dev->ack_notifier);
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kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
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assigned_dev->guest_irq, 0);
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if (assigned_dev->irq_source_id != -1)
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kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
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assigned_dev->irq_source_id = -1;
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assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
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}
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/* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
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static void deassign_host_irq(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *assigned_dev)
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{
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/*
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* We disable irq here to prevent further events.
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*
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* Notice this maybe result in nested disable if the interrupt type is
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* INTx, but it's OK for we are going to free it.
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*
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* If this function is a part of VM destroy, please ensure that till
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* now, the kvm state is still legal for probably we also have to wait
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* on a currently running IRQ handler.
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*/
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if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
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int i;
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for (i = 0; i < assigned_dev->entries_nr; i++)
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disable_irq(assigned_dev->host_msix_entries[i].vector);
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for (i = 0; i < assigned_dev->entries_nr; i++)
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free_irq(assigned_dev->host_msix_entries[i].vector,
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assigned_dev);
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assigned_dev->entries_nr = 0;
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kfree(assigned_dev->host_msix_entries);
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kfree(assigned_dev->guest_msix_entries);
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pci_disable_msix(assigned_dev->dev);
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} else {
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/* Deal with MSI and INTx */
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disable_irq(assigned_dev->host_irq);
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free_irq(assigned_dev->host_irq, assigned_dev);
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if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
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pci_disable_msi(assigned_dev->dev);
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}
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assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
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}
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static int kvm_deassign_irq(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *assigned_dev,
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unsigned long irq_requested_type)
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{
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unsigned long guest_irq_type, host_irq_type;
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if (!irqchip_in_kernel(kvm))
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return -EINVAL;
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/* no irq assignment to deassign */
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if (!assigned_dev->irq_requested_type)
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return -ENXIO;
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host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
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guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
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if (host_irq_type)
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deassign_host_irq(kvm, assigned_dev);
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if (guest_irq_type)
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deassign_guest_irq(kvm, assigned_dev);
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return 0;
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}
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static void kvm_free_assigned_irq(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *assigned_dev)
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{
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kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
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}
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static void kvm_free_assigned_device(struct kvm *kvm,
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struct kvm_assigned_dev_kernel
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*assigned_dev)
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{
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kvm_free_assigned_irq(kvm, assigned_dev);
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pci_reset_function(assigned_dev->dev);
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if (pci_load_and_free_saved_state(assigned_dev->dev,
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&assigned_dev->pci_saved_state))
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printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
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__func__, dev_name(&assigned_dev->dev->dev));
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else
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pci_restore_state(assigned_dev->dev);
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assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
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pci_release_regions(assigned_dev->dev);
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pci_disable_device(assigned_dev->dev);
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pci_dev_put(assigned_dev->dev);
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list_del(&assigned_dev->list);
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kfree(assigned_dev);
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}
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void kvm_free_all_assigned_devices(struct kvm *kvm)
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{
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struct list_head *ptr, *ptr2;
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struct kvm_assigned_dev_kernel *assigned_dev;
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list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
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assigned_dev = list_entry(ptr,
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struct kvm_assigned_dev_kernel,
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list);
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kvm_free_assigned_device(kvm, assigned_dev);
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}
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}
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static int assigned_device_enable_host_intx(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev)
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{
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dev->host_irq = dev->dev->irq;
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/* Even though this is PCI, we don't want to use shared
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* interrupts. Sharing host devices with guest-assigned devices
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* on the same interrupt line is not a happy situation: there
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* are going to be long delays in accepting, acking, etc.
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*/
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if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
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IRQF_ONESHOT, dev->irq_name, dev))
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return -EIO;
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return 0;
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}
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#ifdef __KVM_HAVE_MSI
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static int assigned_device_enable_host_msi(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev)
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{
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int r;
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if (!dev->dev->msi_enabled) {
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r = pci_enable_msi(dev->dev);
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if (r)
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return r;
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}
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dev->host_irq = dev->dev->irq;
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if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
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0, dev->irq_name, dev)) {
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pci_disable_msi(dev->dev);
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return -EIO;
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}
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return 0;
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}
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#endif
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#ifdef __KVM_HAVE_MSIX
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static int assigned_device_enable_host_msix(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev)
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{
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int i, r = -EINVAL;
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/* host_msix_entries and guest_msix_entries should have been
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* initialized */
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if (dev->entries_nr == 0)
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return r;
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r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
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if (r)
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return r;
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for (i = 0; i < dev->entries_nr; i++) {
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r = request_threaded_irq(dev->host_msix_entries[i].vector,
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NULL, kvm_assigned_dev_thread_msix,
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0, dev->irq_name, dev);
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if (r)
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goto err;
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}
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return 0;
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err:
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for (i -= 1; i >= 0; i--)
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free_irq(dev->host_msix_entries[i].vector, dev);
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pci_disable_msix(dev->dev);
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return r;
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}
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#endif
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static int assigned_device_enable_guest_intx(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev,
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struct kvm_assigned_irq *irq)
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{
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dev->guest_irq = irq->guest_irq;
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dev->ack_notifier.gsi = irq->guest_irq;
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return 0;
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}
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#ifdef __KVM_HAVE_MSI
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static int assigned_device_enable_guest_msi(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev,
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struct kvm_assigned_irq *irq)
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{
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dev->guest_irq = irq->guest_irq;
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dev->ack_notifier.gsi = -1;
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dev->host_irq_disabled = false;
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return 0;
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}
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#endif
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#ifdef __KVM_HAVE_MSIX
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static int assigned_device_enable_guest_msix(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev,
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struct kvm_assigned_irq *irq)
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{
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dev->guest_irq = irq->guest_irq;
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dev->ack_notifier.gsi = -1;
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dev->host_irq_disabled = false;
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return 0;
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}
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#endif
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static int assign_host_irq(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev,
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__u32 host_irq_type)
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{
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int r = -EEXIST;
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if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
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return r;
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snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
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pci_name(dev->dev));
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switch (host_irq_type) {
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case KVM_DEV_IRQ_HOST_INTX:
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r = assigned_device_enable_host_intx(kvm, dev);
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break;
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#ifdef __KVM_HAVE_MSI
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case KVM_DEV_IRQ_HOST_MSI:
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r = assigned_device_enable_host_msi(kvm, dev);
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break;
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#endif
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#ifdef __KVM_HAVE_MSIX
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case KVM_DEV_IRQ_HOST_MSIX:
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r = assigned_device_enable_host_msix(kvm, dev);
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break;
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#endif
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default:
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r = -EINVAL;
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}
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if (!r)
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dev->irq_requested_type |= host_irq_type;
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return r;
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}
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static int assign_guest_irq(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *dev,
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struct kvm_assigned_irq *irq,
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unsigned long guest_irq_type)
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{
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int id;
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int r = -EEXIST;
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if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
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return r;
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id = kvm_request_irq_source_id(kvm);
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if (id < 0)
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return id;
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dev->irq_source_id = id;
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switch (guest_irq_type) {
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case KVM_DEV_IRQ_GUEST_INTX:
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r = assigned_device_enable_guest_intx(kvm, dev, irq);
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break;
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#ifdef __KVM_HAVE_MSI
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case KVM_DEV_IRQ_GUEST_MSI:
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r = assigned_device_enable_guest_msi(kvm, dev, irq);
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break;
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#endif
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#ifdef __KVM_HAVE_MSIX
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case KVM_DEV_IRQ_GUEST_MSIX:
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r = assigned_device_enable_guest_msix(kvm, dev, irq);
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break;
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#endif
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default:
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r = -EINVAL;
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}
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if (!r) {
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dev->irq_requested_type |= guest_irq_type;
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if (dev->ack_notifier.gsi != -1)
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kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
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} else
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kvm_free_irq_source_id(kvm, dev->irq_source_id);
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return r;
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}
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/* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
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static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
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struct kvm_assigned_irq *assigned_irq)
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{
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int r = -EINVAL;
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struct kvm_assigned_dev_kernel *match;
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unsigned long host_irq_type, guest_irq_type;
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if (!irqchip_in_kernel(kvm))
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return r;
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mutex_lock(&kvm->lock);
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r = -ENODEV;
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match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
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assigned_irq->assigned_dev_id);
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if (!match)
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goto out;
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host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
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guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
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r = -EINVAL;
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/* can only assign one type at a time */
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if (hweight_long(host_irq_type) > 1)
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goto out;
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if (hweight_long(guest_irq_type) > 1)
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goto out;
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if (host_irq_type == 0 && guest_irq_type == 0)
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goto out;
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r = 0;
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if (host_irq_type)
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r = assign_host_irq(kvm, match, host_irq_type);
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if (r)
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goto out;
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if (guest_irq_type)
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r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
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out:
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mutex_unlock(&kvm->lock);
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return r;
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}
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static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
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struct kvm_assigned_irq
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*assigned_irq)
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{
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int r = -ENODEV;
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struct kvm_assigned_dev_kernel *match;
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mutex_lock(&kvm->lock);
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match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
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assigned_irq->assigned_dev_id);
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if (!match)
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goto out;
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r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
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out:
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mutex_unlock(&kvm->lock);
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|
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;
|
|
u8 header_type;
|
|
|
|
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 */
|
|
pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
|
|
if ((header_type & PCI_HEADER_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));
|
|
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);
|
|
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
|
|
|
|
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_CAP_IRQ_ROUTING
|
|
case KVM_SET_GSI_ROUTING: {
|
|
struct kvm_irq_routing routing;
|
|
struct kvm_irq_routing __user *urouting;
|
|
struct kvm_irq_routing_entry *entries;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&routing, argp, sizeof(routing)))
|
|
goto out;
|
|
r = -EINVAL;
|
|
if (routing.nr >= KVM_MAX_IRQ_ROUTES)
|
|
goto out;
|
|
if (routing.flags)
|
|
goto out;
|
|
r = -ENOMEM;
|
|
entries = vmalloc(routing.nr * sizeof(*entries));
|
|
if (!entries)
|
|
goto out;
|
|
r = -EFAULT;
|
|
urouting = argp;
|
|
if (copy_from_user(entries, urouting->entries,
|
|
routing.nr * sizeof(*entries)))
|
|
goto out_free_irq_routing;
|
|
r = kvm_set_irq_routing(kvm, entries, routing.nr,
|
|
routing.flags);
|
|
out_free_irq_routing:
|
|
vfree(entries);
|
|
break;
|
|
}
|
|
#endif /* KVM_CAP_IRQ_ROUTING */
|
|
#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
|
|
default:
|
|
r = -ENOTTY;
|
|
break;
|
|
}
|
|
out:
|
|
return r;
|
|
}
|
|
|