1059 lines
26 KiB
C
1059 lines
26 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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#include "assigned-dev.h"
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#include "trace/events/kvm.h"
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struct kvm_assigned_dev_kernel {
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struct kvm_irq_ack_notifier ack_notifier;
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struct list_head list;
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int assigned_dev_id;
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int host_segnr;
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int host_busnr;
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int host_devfn;
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unsigned int entries_nr;
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int host_irq;
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bool host_irq_disabled;
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bool pci_2_3;
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struct msix_entry *host_msix_entries;
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int guest_irq;
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struct msix_entry *guest_msix_entries;
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unsigned long irq_requested_type;
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int irq_source_id;
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int flags;
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struct pci_dev *dev;
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struct kvm *kvm;
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spinlock_t intx_lock;
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spinlock_t intx_mask_lock;
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char irq_name[32];
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struct pci_saved_state *pci_saved_state;
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};
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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 kvm_assigned_dev_kernel *match;
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list_for_each_entry(match, head, 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 index;
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}
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static irqreturn_t kvm_assigned_dev_intx(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 ret;
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spin_lock(&assigned_dev->intx_lock);
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if (pci_check_and_mask_intx(assigned_dev->dev)) {
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assigned_dev->host_irq_disabled = true;
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ret = IRQ_WAKE_THREAD;
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} else
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ret = IRQ_NONE;
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spin_unlock(&assigned_dev->intx_lock);
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return ret;
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}
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static void
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kvm_assigned_dev_raise_guest_irq(struct kvm_assigned_dev_kernel *assigned_dev,
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int vector)
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{
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if (unlikely(assigned_dev->irq_requested_type &
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KVM_DEV_IRQ_GUEST_INTX)) {
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spin_lock(&assigned_dev->intx_mask_lock);
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if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
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kvm_set_irq(assigned_dev->kvm,
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assigned_dev->irq_source_id, vector, 1,
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false);
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spin_unlock(&assigned_dev->intx_mask_lock);
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} else
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kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
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vector, 1, false);
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}
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static irqreturn_t kvm_assigned_dev_thread_intx(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->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
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spin_lock_irq(&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_irq(&assigned_dev->intx_lock);
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}
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kvm_assigned_dev_raise_guest_irq(assigned_dev,
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assigned_dev->guest_irq);
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return IRQ_HANDLED;
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}
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/*
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* Deliver an IRQ in an atomic context if we can, or return a failure,
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* user can retry in a process context.
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* Return value:
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* -EWOULDBLOCK - Can't deliver in atomic context: retry in a process context.
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* Other values - No need to retry.
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*/
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static int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq,
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int level)
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{
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struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS];
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struct kvm_kernel_irq_routing_entry *e;
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int ret = -EINVAL;
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int idx;
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trace_kvm_set_irq(irq, level, irq_source_id);
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/*
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* Injection into either PIC or IOAPIC might need to scan all CPUs,
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* which would need to be retried from thread context; when same GSI
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* is connected to both PIC and IOAPIC, we'd have to report a
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* partial failure here.
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* Since there's no easy way to do this, we only support injecting MSI
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* which is limited to 1:1 GSI mapping.
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*/
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idx = srcu_read_lock(&kvm->irq_srcu);
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if (kvm_irq_map_gsi(kvm, entries, irq) > 0) {
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e = &entries[0];
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ret = kvm_arch_set_irq_inatomic(e, kvm, irq_source_id,
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irq, level);
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}
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srcu_read_unlock(&kvm->irq_srcu, idx);
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return ret;
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}
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static irqreturn_t kvm_assigned_dev_msi(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 ret = kvm_set_irq_inatomic(assigned_dev->kvm,
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assigned_dev->irq_source_id,
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assigned_dev->guest_irq, 1);
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return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
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}
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static irqreturn_t kvm_assigned_dev_thread_msi(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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kvm_assigned_dev_raise_guest_irq(assigned_dev,
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assigned_dev->guest_irq);
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return IRQ_HANDLED;
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}
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static irqreturn_t kvm_assigned_dev_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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int ret = 0;
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if (index >= 0) {
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vector = assigned_dev->guest_msix_entries[index].vector;
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ret = kvm_set_irq_inatomic(assigned_dev->kvm,
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assigned_dev->irq_source_id,
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vector, 1);
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}
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return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
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}
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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_assigned_dev_raise_guest_irq(assigned_dev, vector);
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}
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return IRQ_HANDLED;
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}
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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, false);
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spin_lock(&dev->intx_mask_lock);
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if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) {
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bool reassert = false;
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spin_lock_irq(&dev->intx_lock);
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/*
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* The guest IRQ may be shared so this ack can come from an
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* IRQ for another guest device.
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*/
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if (dev->host_irq_disabled) {
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if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3))
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enable_irq(dev->host_irq);
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else if (!pci_check_and_unmask_intx(dev->dev))
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reassert = true;
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dev->host_irq_disabled = reassert;
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}
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spin_unlock_irq(&dev->intx_lock);
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if (reassert)
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kvm_set_irq(dev->kvm, dev->irq_source_id,
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dev->guest_irq, 1, false);
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}
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spin_unlock(&dev->intx_mask_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, false);
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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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if ((assigned_dev->irq_requested_type &
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KVM_DEV_IRQ_HOST_INTX) &&
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(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
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spin_lock_irq(&assigned_dev->intx_lock);
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pci_intx(assigned_dev->dev, false);
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spin_unlock_irq(&assigned_dev->intx_lock);
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synchronize_irq(assigned_dev->host_irq);
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} else
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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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pci_clear_dev_assigned(assigned_dev->dev);
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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 kvm_assigned_dev_kernel *assigned_dev, *tmp;
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list_for_each_entry_safe(assigned_dev, tmp,
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&kvm->arch.assigned_dev_head, 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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irq_handler_t irq_handler;
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unsigned long flags;
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dev->host_irq = dev->dev->irq;
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/*
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* We can only share the IRQ line with other host devices if we are
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* able to disable the IRQ source at device-level - independently of
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* the guest driver. Otherwise host devices may suffer from unbounded
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* IRQ latencies when the guest keeps the line asserted.
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*/
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if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
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irq_handler = kvm_assigned_dev_intx;
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flags = IRQF_SHARED;
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} else {
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irq_handler = NULL;
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flags = IRQF_ONESHOT;
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}
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if (request_threaded_irq(dev->host_irq, irq_handler,
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kvm_assigned_dev_thread_intx, flags,
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dev->irq_name, dev))
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return -EIO;
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if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
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spin_lock_irq(&dev->intx_lock);
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pci_intx(dev->dev, true);
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spin_unlock_irq(&dev->intx_lock);
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}
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return 0;
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}
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|
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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, kvm_assigned_dev_msi,
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kvm_assigned_dev_thread_msi, 0,
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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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|
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return 0;
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}
|
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|
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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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|
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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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|
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r = pci_enable_msix_exact(dev->dev,
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dev->host_msix_entries, dev->entries_nr);
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if (r)
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return r;
|
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|
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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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kvm_assigned_dev_msix,
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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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|
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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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|
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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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|
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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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|
dev->guest_irq = irq->guest_irq;
|
|
dev->ack_notifier.gsi = -1;
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
case KVM_DEV_IRQ_HOST_MSI:
|
|
r = assigned_device_enable_host_msi(kvm, dev);
|
|
break;
|
|
case KVM_DEV_IRQ_HOST_MSIX:
|
|
r = assigned_device_enable_host_msix(kvm, dev);
|
|
break;
|
|
default:
|
|
r = -EINVAL;
|
|
}
|
|
dev->host_irq_disabled = false;
|
|
|
|
if (!r)
|
|
dev->irq_requested_type |= host_irq_type;
|
|
|
|
return r;
|
|
}
|
|
|
|
static int assign_guest_irq(struct kvm *kvm,
|
|
struct kvm_assigned_dev_kernel *dev,
|
|
struct kvm_assigned_irq *irq,
|
|
unsigned long guest_irq_type)
|
|
{
|
|
int id;
|
|
int r = -EEXIST;
|
|
|
|
if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
|
|
return r;
|
|
|
|
id = kvm_request_irq_source_id(kvm);
|
|
if (id < 0)
|
|
return id;
|
|
|
|
dev->irq_source_id = id;
|
|
|
|
switch (guest_irq_type) {
|
|
case KVM_DEV_IRQ_GUEST_INTX:
|
|
r = assigned_device_enable_guest_intx(kvm, dev, irq);
|
|
break;
|
|
case KVM_DEV_IRQ_GUEST_MSI:
|
|
r = assigned_device_enable_guest_msi(kvm, dev, irq);
|
|
break;
|
|
case KVM_DEV_IRQ_GUEST_MSIX:
|
|
r = assigned_device_enable_guest_msix(kvm, dev, irq);
|
|
break;
|
|
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);
|
|
dev->irq_source_id = -1;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
|
|
static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
|
|
struct kvm_assigned_irq *assigned_irq)
|
|
{
|
|
int r = -EINVAL;
|
|
struct kvm_assigned_dev_kernel *match;
|
|
unsigned long host_irq_type, guest_irq_type;
|
|
|
|
if (!irqchip_in_kernel(kvm))
|
|
return r;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
r = -ENODEV;
|
|
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
|
|
assigned_irq->assigned_dev_id);
|
|
if (!match)
|
|
goto out;
|
|
|
|
host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
|
|
guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
|
|
|
|
r = -EINVAL;
|
|
/* can only assign one type at a time */
|
|
if (hweight_long(host_irq_type) > 1)
|
|
goto out;
|
|
if (hweight_long(guest_irq_type) > 1)
|
|
goto out;
|
|
if (host_irq_type == 0 && guest_irq_type == 0)
|
|
goto out;
|
|
|
|
r = 0;
|
|
if (host_irq_type)
|
|
r = assign_host_irq(kvm, match, host_irq_type);
|
|
if (r)
|
|
goto out;
|
|
|
|
if (guest_irq_type)
|
|
r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
|
|
out:
|
|
mutex_unlock(&kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
|
|
struct kvm_assigned_irq
|
|
*assigned_irq)
|
|
{
|
|
int r = -ENODEV;
|
|
struct kvm_assigned_dev_kernel *match;
|
|
unsigned long irq_type;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
|
|
assigned_irq->assigned_dev_id);
|
|
if (!match)
|
|
goto out;
|
|
|
|
irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
|
|
KVM_DEV_IRQ_GUEST_MASK);
|
|
r = kvm_deassign_irq(kvm, match, irq_type);
|
|
out:
|
|
mutex_unlock(&kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* We want to test whether the caller has been granted permissions to
|
|
* use this device. To be able to configure and control the device,
|
|
* the user needs access to PCI configuration space and BAR resources.
|
|
* These are accessed through PCI sysfs. PCI config space is often
|
|
* passed to the process calling this ioctl via file descriptor, so we
|
|
* can't rely on access to that file. We can check for permissions
|
|
* on each of the BAR resource files, which is a pretty clear
|
|
* indicator that the user has been granted access to the device.
|
|
*/
|
|
static int probe_sysfs_permissions(struct pci_dev *dev)
|
|
{
|
|
#ifdef CONFIG_SYSFS
|
|
int i;
|
|
bool bar_found = false;
|
|
|
|
for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
|
|
char *kpath, *syspath;
|
|
struct path path;
|
|
struct inode *inode;
|
|
int r;
|
|
|
|
if (!pci_resource_len(dev, i))
|
|
continue;
|
|
|
|
kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
|
|
if (!kpath)
|
|
return -ENOMEM;
|
|
|
|
/* Per sysfs-rules, sysfs is always at /sys */
|
|
syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
|
|
kfree(kpath);
|
|
if (!syspath)
|
|
return -ENOMEM;
|
|
|
|
r = kern_path(syspath, LOOKUP_FOLLOW, &path);
|
|
kfree(syspath);
|
|
if (r)
|
|
return r;
|
|
|
|
inode = d_backing_inode(path.dentry);
|
|
|
|
r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
|
|
path_put(&path);
|
|
if (r)
|
|
return r;
|
|
|
|
bar_found = true;
|
|
}
|
|
|
|
/* If no resources, probably something special */
|
|
if (!bar_found)
|
|
return -EPERM;
|
|
|
|
return 0;
|
|
#else
|
|
return -EINVAL; /* No way to control the device without sysfs */
|
|
#endif
|
|
}
|
|
|
|
static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
|
|
struct kvm_assigned_pci_dev *assigned_dev)
|
|
{
|
|
int r = 0, idx;
|
|
struct kvm_assigned_dev_kernel *match;
|
|
struct pci_dev *dev;
|
|
|
|
if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
idx = srcu_read_lock(&kvm->srcu);
|
|
|
|
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
|
|
assigned_dev->assigned_dev_id);
|
|
if (match) {
|
|
/* device already assigned */
|
|
r = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
|
|
if (match == NULL) {
|
|
printk(KERN_INFO "%s: Couldn't allocate memory\n",
|
|
__func__);
|
|
r = -ENOMEM;
|
|
goto out;
|
|
}
|
|
dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
|
|
assigned_dev->busnr,
|
|
assigned_dev->devfn);
|
|
if (!dev) {
|
|
printk(KERN_INFO "%s: host device not found\n", __func__);
|
|
r = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
/* Don't allow bridges to be assigned */
|
|
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
|
|
r = -EPERM;
|
|
goto out_put;
|
|
}
|
|
|
|
r = probe_sysfs_permissions(dev);
|
|
if (r)
|
|
goto out_put;
|
|
|
|
if (pci_enable_device(dev)) {
|
|
printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
|
|
r = -EBUSY;
|
|
goto out_put;
|
|
}
|
|
r = pci_request_regions(dev, "kvm_assigned_device");
|
|
if (r) {
|
|
printk(KERN_INFO "%s: Could not get access to device regions\n",
|
|
__func__);
|
|
goto out_disable;
|
|
}
|
|
|
|
pci_reset_function(dev);
|
|
pci_save_state(dev);
|
|
match->pci_saved_state = pci_store_saved_state(dev);
|
|
if (!match->pci_saved_state)
|
|
printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
|
|
__func__, dev_name(&dev->dev));
|
|
|
|
if (!pci_intx_mask_supported(dev))
|
|
assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
|
|
|
|
match->assigned_dev_id = assigned_dev->assigned_dev_id;
|
|
match->host_segnr = assigned_dev->segnr;
|
|
match->host_busnr = assigned_dev->busnr;
|
|
match->host_devfn = assigned_dev->devfn;
|
|
match->flags = assigned_dev->flags;
|
|
match->dev = dev;
|
|
spin_lock_init(&match->intx_lock);
|
|
spin_lock_init(&match->intx_mask_lock);
|
|
match->irq_source_id = -1;
|
|
match->kvm = kvm;
|
|
match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
|
|
|
|
list_add(&match->list, &kvm->arch.assigned_dev_head);
|
|
|
|
if (!kvm->arch.iommu_domain) {
|
|
r = kvm_iommu_map_guest(kvm);
|
|
if (r)
|
|
goto out_list_del;
|
|
}
|
|
r = kvm_assign_device(kvm, match->dev);
|
|
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->dev);
|
|
|
|
kvm_free_assigned_device(kvm, match);
|
|
|
|
out:
|
|
mutex_unlock(&kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm,
|
|
struct kvm_assigned_pci_dev *assigned_dev)
|
|
{
|
|
int r = 0;
|
|
struct kvm_assigned_dev_kernel *match;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
|
|
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
|
|
assigned_dev->assigned_dev_id);
|
|
if (!match) {
|
|
r = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&match->intx_mask_lock);
|
|
|
|
match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
|
|
match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
|
|
|
|
if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
|
|
if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
|
|
kvm_set_irq(match->kvm, match->irq_source_id,
|
|
match->guest_irq, 0, false);
|
|
/*
|
|
* Masking at hardware-level is performed on demand,
|
|
* i.e. when an IRQ actually arrives at the host.
|
|
*/
|
|
} else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
|
|
/*
|
|
* Unmask the IRQ line if required. Unmasking at
|
|
* device level will be performed by user space.
|
|
*/
|
|
spin_lock_irq(&match->intx_lock);
|
|
if (match->host_irq_disabled) {
|
|
enable_irq(match->host_irq);
|
|
match->host_irq_disabled = false;
|
|
}
|
|
spin_unlock_irq(&match->intx_lock);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&match->intx_mask_lock);
|
|
|
|
out:
|
|
mutex_unlock(&kvm->lock);
|
|
return r;
|
|
}
|
|
|
|
long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
|
|
unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
int r;
|
|
|
|
switch (ioctl) {
|
|
case KVM_ASSIGN_PCI_DEVICE: {
|
|
struct kvm_assigned_pci_dev assigned_dev;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
|
|
goto out;
|
|
r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_ASSIGN_IRQ: {
|
|
r = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
case KVM_ASSIGN_DEV_IRQ: {
|
|
struct kvm_assigned_irq assigned_irq;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
|
|
goto out;
|
|
r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_DEASSIGN_DEV_IRQ: {
|
|
struct kvm_assigned_irq assigned_irq;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
|
|
goto out;
|
|
r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
case KVM_DEASSIGN_PCI_DEVICE: {
|
|
struct kvm_assigned_pci_dev assigned_dev;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
|
|
goto out;
|
|
r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
|
|
if (r)
|
|
goto out;
|
|
break;
|
|
}
|
|
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;
|
|
}
|
|
case KVM_ASSIGN_SET_INTX_MASK: {
|
|
struct kvm_assigned_pci_dev assigned_dev;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
|
|
goto out;
|
|
r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);
|
|
break;
|
|
}
|
|
default:
|
|
r = -ENOTTY;
|
|
break;
|
|
}
|
|
out:
|
|
return r;
|
|
}
|