vfio: support notifier chain in vfio_group
Beyond vfio_iommu events, users might also be interested in vfio_group events. For example, if a vfio_group is used along with Qemu/KVM, whenever kvm pointer is set to/cleared from the vfio_group, users could be notified. Currently only VFIO_GROUP_NOTIFY_SET_KVM supported. Cc: Kirti Wankhede <kwankhede@nvidia.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Jike Song <jike.song@intel.com> [aw: remove use of new typedef] Signed-off-by: Alex Williamson <alex.williamson@redhat.com>hifive-unleashed-5.1
Jike Song
Alex Williamson
parent
22195cbd34
commit
ccd46dbae7
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@ -86,6 +86,8 @@ struct vfio_group {
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struct mutex unbound_lock;
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atomic_t opened;
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bool noiommu;
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struct kvm *kvm;
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struct blocking_notifier_head notifier;
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};
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struct vfio_device {
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@ -339,6 +341,7 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
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#ifdef CONFIG_VFIO_NOIOMMU
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group->noiommu = (iommu_group_get_iommudata(iommu_group) == &noiommu);
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#endif
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BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);
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group->nb.notifier_call = vfio_iommu_group_notifier;
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@ -1581,6 +1584,9 @@ static int vfio_group_fops_release(struct inode *inode, struct file *filep)
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filep->private_data = NULL;
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/* Any user didn't unregister? */
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WARN_ON(group->notifier.head);
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vfio_group_try_dissolve_container(group);
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atomic_dec(&group->opened);
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@ -2063,6 +2069,76 @@ static int vfio_unregister_iommu_notifier(struct vfio_group *group,
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return ret;
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}
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void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm)
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{
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group->kvm = kvm;
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blocking_notifier_call_chain(&group->notifier,
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VFIO_GROUP_NOTIFY_SET_KVM, kvm);
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}
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EXPORT_SYMBOL_GPL(vfio_group_set_kvm);
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static int vfio_register_group_notifier(struct vfio_group *group,
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unsigned long *events,
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struct notifier_block *nb)
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{
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struct vfio_container *container;
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int ret;
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bool set_kvm = false;
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if (*events & VFIO_GROUP_NOTIFY_SET_KVM)
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set_kvm = true;
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/* clear known events */
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*events &= ~VFIO_GROUP_NOTIFY_SET_KVM;
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/* refuse to continue if still events remaining */
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if (*events)
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return -EINVAL;
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ret = vfio_group_add_container_user(group);
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if (ret)
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return -EINVAL;
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container = group->container;
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down_read(&container->group_lock);
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ret = blocking_notifier_chain_register(&group->notifier, nb);
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/*
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* The attaching of kvm and vfio_group might already happen, so
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* here we replay once upon registration.
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*/
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if (!ret && set_kvm && group->kvm)
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blocking_notifier_call_chain(&group->notifier,
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VFIO_GROUP_NOTIFY_SET_KVM, group->kvm);
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up_read(&container->group_lock);
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vfio_group_try_dissolve_container(group);
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return ret;
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}
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static int vfio_unregister_group_notifier(struct vfio_group *group,
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struct notifier_block *nb)
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{
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struct vfio_container *container;
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int ret;
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ret = vfio_group_add_container_user(group);
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if (ret)
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return -EINVAL;
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container = group->container;
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down_read(&container->group_lock);
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ret = blocking_notifier_chain_unregister(&group->notifier, nb);
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up_read(&container->group_lock);
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vfio_group_try_dissolve_container(group);
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return ret;
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}
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int vfio_register_notifier(struct device *dev, enum vfio_notify_type type,
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unsigned long *events, struct notifier_block *nb)
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{
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@ -2080,6 +2156,9 @@ int vfio_register_notifier(struct device *dev, enum vfio_notify_type type,
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case VFIO_IOMMU_NOTIFY:
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ret = vfio_register_iommu_notifier(group, events, nb);
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break;
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case VFIO_GROUP_NOTIFY:
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ret = vfio_register_group_notifier(group, events, nb);
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break;
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default:
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ret = -EINVAL;
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}
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@ -2106,6 +2185,9 @@ int vfio_unregister_notifier(struct device *dev, enum vfio_notify_type type,
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case VFIO_IOMMU_NOTIFY:
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ret = vfio_unregister_iommu_notifier(group, nb);
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break;
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case VFIO_GROUP_NOTIFY:
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ret = vfio_unregister_group_notifier(group, nb);
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break;
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default:
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ret = -EINVAL;
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}
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@ -111,11 +111,15 @@ extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
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/* each type has independent events */
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enum vfio_notify_type {
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VFIO_IOMMU_NOTIFY = 0,
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VFIO_GROUP_NOTIFY = 1,
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};
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/* events for VFIO_IOMMU_NOTIFY */
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#define VFIO_IOMMU_NOTIFY_DMA_UNMAP BIT(0)
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/* events for VFIO_GROUP_NOTIFY */
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#define VFIO_GROUP_NOTIFY_SET_KVM BIT(0)
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extern int vfio_register_notifier(struct device *dev,
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enum vfio_notify_type type,
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unsigned long *required_events,
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@ -124,6 +128,9 @@ extern int vfio_unregister_notifier(struct device *dev,
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enum vfio_notify_type type,
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struct notifier_block *nb);
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struct kvm;
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extern void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
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/*
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* Sub-module helpers
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*/
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