KVM: Move device assignment logic to common code
To share with other archs, this patch moves device assignment logic to common parts. Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Xiantao Zhang
Avi Kivity
Родитель
371c01b28e
Коммит
8a98f6648a
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@ -30,7 +30,6 @@
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#include <linux/interrupt.h>
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#include <linux/kvm.h>
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#include <linux/fs.h>
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#include <linux/pci.h>
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/mman.h>
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@ -107,238 +106,6 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
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{ NULL }
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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 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 void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
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{
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struct kvm_assigned_dev_kernel *assigned_dev;
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assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
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interrupt_work);
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/* This is taken to safely inject irq inside the guest. When
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* the interrupt injection (or the ioapic code) uses a
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* finer-grained lock, update this
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*/
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mutex_lock(&assigned_dev->kvm->lock);
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kvm_set_irq(assigned_dev->kvm,
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assigned_dev->guest_irq, 1);
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mutex_unlock(&assigned_dev->kvm->lock);
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kvm_put_kvm(assigned_dev->kvm);
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}
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/* FIXME: Implement the OR logic needed to make shared interrupts on
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* this line behave properly
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*/
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static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev =
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(struct kvm_assigned_dev_kernel *) dev_id;
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kvm_get_kvm(assigned_dev->kvm);
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schedule_work(&assigned_dev->interrupt_work);
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disable_irq_nosync(irq);
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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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if (kian->gsi == -1)
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return;
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dev = container_of(kian, struct kvm_assigned_dev_kernel,
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ack_notifier);
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kvm_set_irq(dev->kvm, dev->guest_irq, 0);
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enable_irq(dev->host_irq);
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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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if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested)
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free_irq(assigned_dev->host_irq, (void *)assigned_dev);
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kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
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if (cancel_work_sync(&assigned_dev->interrupt_work))
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/* We had pending work. That means we will have to take
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* care of kvm_put_kvm.
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*/
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kvm_put_kvm(kvm);
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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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static 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 kvm_vm_ioctl_assign_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 = 0;
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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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mutex_unlock(&kvm->lock);
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return -EINVAL;
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}
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if (match->irq_requested) {
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match->guest_irq = assigned_irq->guest_irq;
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match->ack_notifier.gsi = assigned_irq->guest_irq;
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mutex_unlock(&kvm->lock);
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return 0;
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}
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INIT_WORK(&match->interrupt_work,
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kvm_assigned_dev_interrupt_work_handler);
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if (irqchip_in_kernel(kvm)) {
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if (!capable(CAP_SYS_RAWIO)) {
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r = -EPERM;
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goto out_release;
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}
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if (assigned_irq->host_irq)
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match->host_irq = assigned_irq->host_irq;
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else
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match->host_irq = match->dev->irq;
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match->guest_irq = assigned_irq->guest_irq;
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match->ack_notifier.gsi = assigned_irq->guest_irq;
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match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
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kvm_register_irq_ack_notifier(kvm, &match->ack_notifier);
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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_irq(match->host_irq, kvm_assigned_dev_intr, 0,
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"kvm_assigned_device", (void *)match)) {
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r = -EIO;
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goto out_release;
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}
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}
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match->irq_requested = true;
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mutex_unlock(&kvm->lock);
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return r;
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out_release:
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mutex_unlock(&kvm->lock);
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kvm_free_assigned_device(kvm, match);
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return r;
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}
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static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
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struct kvm_assigned_pci_dev *assigned_dev)
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{
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int r = 0;
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struct kvm_assigned_dev_kernel *match;
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struct pci_dev *dev;
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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_dev->assigned_dev_id);
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if (match) {
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/* device already assigned */
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r = -EINVAL;
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goto out;
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}
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match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
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if (match == NULL) {
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printk(KERN_INFO "%s: Couldn't allocate memory\n",
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__func__);
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r = -ENOMEM;
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goto out;
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}
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dev = pci_get_bus_and_slot(assigned_dev->busnr,
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assigned_dev->devfn);
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if (!dev) {
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printk(KERN_INFO "%s: host device not found\n", __func__);
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r = -EINVAL;
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goto out_free;
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}
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if (pci_enable_device(dev)) {
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printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
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r = -EBUSY;
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goto out_put;
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}
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r = pci_request_regions(dev, "kvm_assigned_device");
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if (r) {
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printk(KERN_INFO "%s: Could not get access to device regions\n",
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__func__);
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goto out_disable;
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}
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match->assigned_dev_id = assigned_dev->assigned_dev_id;
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match->host_busnr = assigned_dev->busnr;
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match->host_devfn = assigned_dev->devfn;
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match->dev = dev;
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match->kvm = kvm;
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list_add(&match->list, &kvm->arch.assigned_dev_head);
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if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
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r = kvm_iommu_map_guest(kvm, match);
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if (r)
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goto out_list_del;
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}
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out:
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mutex_unlock(&kvm->lock);
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return r;
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out_list_del:
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list_del(&match->list);
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pci_release_regions(dev);
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out_disable:
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pci_disable_device(dev);
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out_put:
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pci_dev_put(dev);
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out_free:
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kfree(match);
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mutex_unlock(&kvm->lock);
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return r;
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}
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unsigned long segment_base(u16 selector)
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{
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struct descriptor_table gdt;
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@ -2030,28 +1797,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
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goto out;
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break;
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}
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case KVM_ASSIGN_PCI_DEVICE: {
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struct kvm_assigned_pci_dev assigned_dev;
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r = -EFAULT;
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if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
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goto out;
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r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
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if (r)
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goto out;
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break;
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}
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case KVM_ASSIGN_IRQ: {
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struct kvm_assigned_irq assigned_irq;
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r = -EFAULT;
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if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
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goto out;
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r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
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if (r)
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goto out;
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break;
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}
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case KVM_GET_PIT: {
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r = -EFAULT;
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if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
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@ -383,7 +383,9 @@ struct kvm_trace_rec {
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#define KVM_CAP_MP_STATE 14
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#define KVM_CAP_COALESCED_MMIO 15
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#define KVM_CAP_SYNC_MMU 16 /* Changes to host mmap are reflected in guest */
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#ifdef CONFIG_X86
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#define KVM_CAP_DEVICE_ASSIGNMENT 17
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#endif
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#define KVM_CAP_IOMMU 18
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/*
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@ -281,6 +281,7 @@ void kvm_free_physmem(struct kvm *kvm);
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struct kvm *kvm_arch_create_vm(void);
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void kvm_arch_destroy_vm(struct kvm *kvm);
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void kvm_free_all_assigned_devices(struct kvm *kvm);
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int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
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int kvm_cpu_has_interrupt(struct kvm_vcpu *v);
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@ -51,6 +51,12 @@
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#include "coalesced_mmio.h"
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#endif
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#ifdef KVM_CAP_DEVICE_ASSIGNMENT
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include "irq.h"
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#endif
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MODULE_AUTHOR("Qumranet");
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MODULE_LICENSE("GPL");
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@ -71,6 +77,240 @@ static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
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bool kvm_rebooting;
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#ifdef KVM_CAP_DEVICE_ASSIGNMENT
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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 void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
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{
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struct kvm_assigned_dev_kernel *assigned_dev;
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assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
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interrupt_work);
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/* This is taken to safely inject irq inside the guest. When
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* the interrupt injection (or the ioapic code) uses a
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* finer-grained lock, update this
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*/
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mutex_lock(&assigned_dev->kvm->lock);
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kvm_set_irq(assigned_dev->kvm,
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assigned_dev->guest_irq, 1);
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mutex_unlock(&assigned_dev->kvm->lock);
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kvm_put_kvm(assigned_dev->kvm);
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}
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/* FIXME: Implement the OR logic needed to make shared interrupts on
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* this line behave properly
|
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*/
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static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
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{
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struct kvm_assigned_dev_kernel *assigned_dev =
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(struct kvm_assigned_dev_kernel *) dev_id;
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kvm_get_kvm(assigned_dev->kvm);
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schedule_work(&assigned_dev->interrupt_work);
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disable_irq_nosync(irq);
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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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if (kian->gsi == -1)
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return;
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dev = container_of(kian, struct kvm_assigned_dev_kernel,
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ack_notifier);
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kvm_set_irq(dev->kvm, dev->guest_irq, 0);
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enable_irq(dev->host_irq);
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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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if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested)
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free_irq(assigned_dev->host_irq, (void *)assigned_dev);
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kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
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if (cancel_work_sync(&assigned_dev->interrupt_work))
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/* We had pending work. That means we will have to take
|
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* care of kvm_put_kvm.
|
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*/
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kvm_put_kvm(kvm);
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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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|
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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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|
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static int kvm_vm_ioctl_assign_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 = 0;
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struct kvm_assigned_dev_kernel *match;
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|
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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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mutex_unlock(&kvm->lock);
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return -EINVAL;
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}
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|
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if (match->irq_requested) {
|
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match->guest_irq = assigned_irq->guest_irq;
|
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match->ack_notifier.gsi = assigned_irq->guest_irq;
|
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mutex_unlock(&kvm->lock);
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return 0;
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}
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|
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INIT_WORK(&match->interrupt_work,
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kvm_assigned_dev_interrupt_work_handler);
|
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|
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if (irqchip_in_kernel(kvm)) {
|
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if (!capable(CAP_SYS_RAWIO)) {
|
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r = -EPERM;
|
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goto out_release;
|
||||
}
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|
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if (assigned_irq->host_irq)
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match->host_irq = assigned_irq->host_irq;
|
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else
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match->host_irq = match->dev->irq;
|
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match->guest_irq = assigned_irq->guest_irq;
|
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match->ack_notifier.gsi = assigned_irq->guest_irq;
|
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match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
|
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kvm_register_irq_ack_notifier(kvm, &match->ack_notifier);
|
||||
|
||||
/* Even though this is PCI, we don't want to use shared
|
||||
* interrupts. Sharing host devices with guest-assigned devices
|
||||
* on the same interrupt line is not a happy situation: there
|
||||
* are going to be long delays in accepting, acking, etc.
|
||||
*/
|
||||
if (request_irq(match->host_irq, kvm_assigned_dev_intr, 0,
|
||||
"kvm_assigned_device", (void *)match)) {
|
||||
r = -EIO;
|
||||
goto out_release;
|
||||
}
|
||||
}
|
||||
|
||||
match->irq_requested = true;
|
||||
mutex_unlock(&kvm->lock);
|
||||
return r;
|
||||
out_release:
|
||||
mutex_unlock(&kvm->lock);
|
||||
kvm_free_assigned_device(kvm, match);
|
||||
return r;
|
||||
}
|
||||
|
||||
static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
|
||||
struct kvm_assigned_pci_dev *assigned_dev)
|
||||
{
|
||||
int r = 0;
|
||||
struct kvm_assigned_dev_kernel *match;
|
||||
struct pci_dev *dev;
|
||||
|
||||
mutex_lock(&kvm->lock);
|
||||
|
||||
match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
|
||||
assigned_dev->assigned_dev_id);
|
||||
if (match) {
|
||||
/* device already assigned */
|
||||
r = -EINVAL;
|
||||
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_bus_and_slot(assigned_dev->busnr,
|
||||
assigned_dev->devfn);
|
||||
if (!dev) {
|
||||
printk(KERN_INFO "%s: host device not found\n", __func__);
|
||||
r = -EINVAL;
|
||||
goto out_free;
|
||||
}
|
||||
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;
|
||||
}
|
||||
match->assigned_dev_id = assigned_dev->assigned_dev_id;
|
||||
match->host_busnr = assigned_dev->busnr;
|
||||
match->host_devfn = assigned_dev->devfn;
|
||||
match->dev = dev;
|
||||
|
||||
match->kvm = kvm;
|
||||
|
||||
list_add(&match->list, &kvm->arch.assigned_dev_head);
|
||||
|
||||
if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
|
||||
r = kvm_iommu_map_guest(kvm, match);
|
||||
if (r)
|
||||
goto out_list_del;
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&kvm->lock);
|
||||
return r;
|
||||
out_list_del:
|
||||
list_del(&match->list);
|
||||
pci_release_regions(dev);
|
||||
out_disable:
|
||||
pci_disable_device(dev);
|
||||
out_put:
|
||||
pci_dev_put(dev);
|
||||
out_free:
|
||||
kfree(match);
|
||||
mutex_unlock(&kvm->lock);
|
||||
return r;
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline int valid_vcpu(int n)
|
||||
{
|
||||
return likely(n >= 0 && n < KVM_MAX_VCPUS);
|
||||
|
|
@ -578,12 +818,12 @@ int __kvm_set_memory_region(struct kvm *kvm,
|
|||
}
|
||||
|
||||
kvm_free_physmem_slot(&old, &new);
|
||||
|
||||
#ifdef CONFIG_DMAR
|
||||
/* map the pages in iommu page table */
|
||||
r = kvm_iommu_map_pages(kvm, base_gfn, npages);
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
#endif
|
||||
return 0;
|
||||
|
||||
out_free:
|
||||
|
|
@ -1382,6 +1622,30 @@ static long kvm_vm_ioctl(struct file *filp,
|
|||
r = 0;
|
||||
break;
|
||||
}
|
||||
#endif
|
||||
#ifdef KVM_CAP_DEVICE_ASSIGNMENT
|
||||
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: {
|
||||
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;
|
||||
}
|
||||
#endif
|
||||
default:
|
||||
r = kvm_arch_vm_ioctl(filp, ioctl, arg);
|
||||
|
|
|
|||
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