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vfio: remove VFIO_GROUP_NOTIFY_SET_KVM
Rather than relying on a notifier for associating the KVM with the group, let's assume that the association has already been made prior to device_open. The first time a device is opened associate the group KVM with the device. This fixes a user-triggerable oops in GVT. Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Acked-by: Zhi Wang <zhi.a.wang@intel.com> Link: https://lore.kernel.org/r/20220519183311.582380-2-mjrosato@linux.ibm.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Matthew Rosato
Alex Williamson
parent
c490513c81
commit
421cfe6596
@ -51,7 +51,7 @@ static int preallocated_oos_pages = 8192;
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static bool intel_gvt_is_valid_gfn(struct intel_vgpu *vgpu, unsigned long gfn)
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{
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struct kvm *kvm = vgpu->kvm;
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struct kvm *kvm = vgpu->vfio_device.kvm;
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int idx;
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bool ret;
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@ -1185,7 +1185,7 @@ static int is_2MB_gtt_possible(struct intel_vgpu *vgpu,
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if (!vgpu->attached)
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return -EINVAL;
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pfn = gfn_to_pfn(vgpu->kvm, ops->get_pfn(entry));
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pfn = gfn_to_pfn(vgpu->vfio_device.kvm, ops->get_pfn(entry));
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if (is_error_noslot_pfn(pfn))
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return -EINVAL;
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return PageTransHuge(pfn_to_page(pfn));
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@ -227,9 +227,6 @@ struct intel_vgpu {
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struct mutex cache_lock;
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struct notifier_block iommu_notifier;
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struct notifier_block group_notifier;
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struct kvm *kvm;
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struct work_struct release_work;
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atomic_t released;
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struct kvm_page_track_notifier_node track_node;
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@ -228,8 +228,6 @@ static void intel_gvt_cleanup_vgpu_type_groups(struct intel_gvt *gvt)
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}
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}
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static void intel_vgpu_release_work(struct work_struct *work);
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static void gvt_unpin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
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unsigned long size)
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{
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@ -761,23 +759,6 @@ static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
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return NOTIFY_OK;
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}
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static int intel_vgpu_group_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct intel_vgpu *vgpu =
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container_of(nb, struct intel_vgpu, group_notifier);
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/* the only action we care about */
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if (action == VFIO_GROUP_NOTIFY_SET_KVM) {
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vgpu->kvm = data;
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if (!data)
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schedule_work(&vgpu->release_work);
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}
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return NOTIFY_OK;
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}
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static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu)
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{
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struct intel_vgpu *itr;
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@ -789,7 +770,7 @@ static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu)
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if (!itr->attached)
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continue;
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if (vgpu->kvm == itr->kvm) {
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if (vgpu->vfio_device.kvm == itr->vfio_device.kvm) {
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ret = true;
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goto out;
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}
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@ -806,7 +787,6 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev)
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int ret;
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vgpu->iommu_notifier.notifier_call = intel_vgpu_iommu_notifier;
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vgpu->group_notifier.notifier_call = intel_vgpu_group_notifier;
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events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
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ret = vfio_register_notifier(vfio_dev, VFIO_IOMMU_NOTIFY, &events,
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@ -817,38 +797,32 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev)
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goto out;
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}
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events = VFIO_GROUP_NOTIFY_SET_KVM;
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ret = vfio_register_notifier(vfio_dev, VFIO_GROUP_NOTIFY, &events,
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&vgpu->group_notifier);
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if (ret != 0) {
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gvt_vgpu_err("vfio_register_notifier for group failed: %d\n",
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ret);
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ret = -EEXIST;
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if (vgpu->attached)
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goto undo_iommu;
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ret = -ESRCH;
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if (!vgpu->vfio_device.kvm ||
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vgpu->vfio_device.kvm->mm != current->mm) {
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gvt_vgpu_err("KVM is required to use Intel vGPU\n");
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goto undo_iommu;
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}
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ret = -EEXIST;
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if (vgpu->attached)
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goto undo_register;
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ret = -ESRCH;
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if (!vgpu->kvm || vgpu->kvm->mm != current->mm) {
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gvt_vgpu_err("KVM is required to use Intel vGPU\n");
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goto undo_register;
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}
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kvm_get_kvm(vgpu->vfio_device.kvm);
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ret = -EEXIST;
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if (__kvmgt_vgpu_exist(vgpu))
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goto undo_register;
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goto undo_iommu;
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vgpu->attached = true;
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kvm_get_kvm(vgpu->kvm);
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kvmgt_protect_table_init(vgpu);
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gvt_cache_init(vgpu);
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vgpu->track_node.track_write = kvmgt_page_track_write;
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vgpu->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
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kvm_page_track_register_notifier(vgpu->kvm, &vgpu->track_node);
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kvm_page_track_register_notifier(vgpu->vfio_device.kvm,
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&vgpu->track_node);
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debugfs_create_ulong(KVMGT_DEBUGFS_FILENAME, 0444, vgpu->debugfs,
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&vgpu->nr_cache_entries);
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@ -858,10 +832,6 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev)
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atomic_set(&vgpu->released, 0);
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return 0;
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undo_register:
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vfio_unregister_notifier(vfio_dev, VFIO_GROUP_NOTIFY,
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&vgpu->group_notifier);
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undo_iommu:
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vfio_unregister_notifier(vfio_dev, VFIO_IOMMU_NOTIFY,
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&vgpu->iommu_notifier);
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@ -880,8 +850,9 @@ static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu)
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}
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}
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static void __intel_vgpu_release(struct intel_vgpu *vgpu)
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static void intel_vgpu_close_device(struct vfio_device *vfio_dev)
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{
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struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
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struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
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int ret;
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@ -898,35 +869,19 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
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drm_WARN(&i915->drm, ret,
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"vfio_unregister_notifier for iommu failed: %d\n", ret);
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ret = vfio_unregister_notifier(&vgpu->vfio_device, VFIO_GROUP_NOTIFY,
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&vgpu->group_notifier);
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drm_WARN(&i915->drm, ret,
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"vfio_unregister_notifier for group failed: %d\n", ret);
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debugfs_remove(debugfs_lookup(KVMGT_DEBUGFS_FILENAME, vgpu->debugfs));
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kvm_page_track_unregister_notifier(vgpu->kvm, &vgpu->track_node);
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kvm_put_kvm(vgpu->kvm);
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kvm_page_track_unregister_notifier(vgpu->vfio_device.kvm,
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&vgpu->track_node);
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kvmgt_protect_table_destroy(vgpu);
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gvt_cache_destroy(vgpu);
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intel_vgpu_release_msi_eventfd_ctx(vgpu);
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vgpu->kvm = NULL;
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vgpu->attached = false;
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}
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static void intel_vgpu_close_device(struct vfio_device *vfio_dev)
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{
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__intel_vgpu_release(vfio_dev_to_vgpu(vfio_dev));
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}
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static void intel_vgpu_release_work(struct work_struct *work)
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{
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struct intel_vgpu *vgpu =
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container_of(work, struct intel_vgpu, release_work);
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__intel_vgpu_release(vgpu);
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if (vgpu->vfio_device.kvm)
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kvm_put_kvm(vgpu->vfio_device.kvm);
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}
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static u64 intel_vgpu_get_bar_addr(struct intel_vgpu *vgpu, int bar)
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@ -1675,7 +1630,6 @@ static int intel_vgpu_probe(struct mdev_device *mdev)
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return PTR_ERR(vgpu);
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}
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INIT_WORK(&vgpu->release_work, intel_vgpu_release_work);
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vfio_init_group_dev(&vgpu->vfio_device, &mdev->dev,
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&intel_vgpu_dev_ops);
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@ -1713,7 +1667,7 @@ static struct mdev_driver intel_vgpu_mdev_driver = {
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int intel_gvt_page_track_add(struct intel_vgpu *info, u64 gfn)
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{
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struct kvm *kvm = info->kvm;
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struct kvm *kvm = info->vfio_device.kvm;
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struct kvm_memory_slot *slot;
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int idx;
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@ -1743,7 +1697,7 @@ out:
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int intel_gvt_page_track_remove(struct intel_vgpu *info, u64 gfn)
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{
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struct kvm *kvm = info->kvm;
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struct kvm *kvm = info->vfio_device.kvm;
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struct kvm_memory_slot *slot;
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int idx;
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@ -1284,25 +1284,6 @@ static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
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}
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}
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static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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int notify_rc = NOTIFY_OK;
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struct ap_matrix_mdev *matrix_mdev;
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if (action != VFIO_GROUP_NOTIFY_SET_KVM)
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return NOTIFY_OK;
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matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
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if (!data)
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vfio_ap_mdev_unset_kvm(matrix_mdev);
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else if (vfio_ap_mdev_set_kvm(matrix_mdev, data))
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notify_rc = NOTIFY_DONE;
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return notify_rc;
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}
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static struct vfio_ap_queue *vfio_ap_find_queue(int apqn)
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{
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struct device *dev;
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@ -1402,11 +1383,10 @@ static int vfio_ap_mdev_open_device(struct vfio_device *vdev)
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unsigned long events;
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int ret;
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matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
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events = VFIO_GROUP_NOTIFY_SET_KVM;
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if (!vdev->kvm)
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return -EINVAL;
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ret = vfio_register_notifier(vdev, VFIO_GROUP_NOTIFY, &events,
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&matrix_mdev->group_notifier);
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ret = vfio_ap_mdev_set_kvm(matrix_mdev, vdev->kvm);
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if (ret)
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return ret;
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@ -1415,12 +1395,11 @@ static int vfio_ap_mdev_open_device(struct vfio_device *vdev)
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ret = vfio_register_notifier(vdev, VFIO_IOMMU_NOTIFY, &events,
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&matrix_mdev->iommu_notifier);
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if (ret)
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goto out_unregister_group;
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goto err_kvm;
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return 0;
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out_unregister_group:
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vfio_unregister_notifier(vdev, VFIO_GROUP_NOTIFY,
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&matrix_mdev->group_notifier);
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err_kvm:
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vfio_ap_mdev_unset_kvm(matrix_mdev);
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return ret;
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}
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@ -1431,8 +1410,6 @@ static void vfio_ap_mdev_close_device(struct vfio_device *vdev)
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vfio_unregister_notifier(vdev, VFIO_IOMMU_NOTIFY,
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&matrix_mdev->iommu_notifier);
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vfio_unregister_notifier(vdev, VFIO_GROUP_NOTIFY,
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&matrix_mdev->group_notifier);
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vfio_ap_mdev_unset_kvm(matrix_mdev);
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}
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@ -81,8 +81,6 @@ struct ap_matrix {
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* @node: allows the ap_matrix_mdev struct to be added to a list
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* @matrix: the adapters, usage domains and control domains assigned to the
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* mediated matrix device.
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* @group_notifier: notifier block used for specifying callback function for
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* handling the VFIO_GROUP_NOTIFY_SET_KVM event
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* @iommu_notifier: notifier block used for specifying callback function for
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* handling the VFIO_IOMMU_NOTIFY_DMA_UNMAP even
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* @kvm: the struct holding guest's state
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@ -94,7 +92,6 @@ struct ap_matrix_mdev {
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struct vfio_device vdev;
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struct list_head node;
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struct ap_matrix matrix;
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struct notifier_block group_notifier;
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struct notifier_block iommu_notifier;
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struct kvm *kvm;
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crypto_hook pqap_hook;
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@ -1088,10 +1088,21 @@ static struct file *vfio_device_open(struct vfio_device *device)
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mutex_lock(&device->dev_set->lock);
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device->open_count++;
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if (device->open_count == 1 && device->ops->open_device) {
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ret = device->ops->open_device(device);
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if (ret)
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goto err_undo_count;
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if (device->open_count == 1) {
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/*
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* Here we pass the KVM pointer with the group under the read
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* lock. If the device driver will use it, it must obtain a
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* reference and release it during close_device.
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*/
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down_read(&device->group->group_rwsem);
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device->kvm = device->group->kvm;
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if (device->ops->open_device) {
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ret = device->ops->open_device(device);
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if (ret)
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goto err_undo_count;
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}
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up_read(&device->group->group_rwsem);
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}
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mutex_unlock(&device->dev_set->lock);
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@ -1124,10 +1135,14 @@ static struct file *vfio_device_open(struct vfio_device *device)
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err_close_device:
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mutex_lock(&device->dev_set->lock);
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down_read(&device->group->group_rwsem);
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if (device->open_count == 1 && device->ops->close_device)
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device->ops->close_device(device);
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err_undo_count:
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device->open_count--;
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if (device->open_count == 0 && device->kvm)
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device->kvm = NULL;
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up_read(&device->group->group_rwsem);
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mutex_unlock(&device->dev_set->lock);
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module_put(device->dev->driver->owner);
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err_unassign_container:
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@ -1320,9 +1335,13 @@ static int vfio_device_fops_release(struct inode *inode, struct file *filep)
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mutex_lock(&device->dev_set->lock);
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vfio_assert_device_open(device);
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down_read(&device->group->group_rwsem);
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if (device->open_count == 1 && device->ops->close_device)
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device->ops->close_device(device);
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up_read(&device->group->group_rwsem);
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device->open_count--;
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if (device->open_count == 0)
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device->kvm = NULL;
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mutex_unlock(&device->dev_set->lock);
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module_put(device->dev->driver->owner);
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@ -1731,8 +1750,8 @@ EXPORT_SYMBOL_GPL(vfio_file_enforced_coherent);
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* @file: VFIO group file
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* @kvm: KVM to link
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*
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* The kvm pointer will be forwarded to all the vfio_device's attached to the
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* VFIO file via the VFIO_GROUP_NOTIFY_SET_KVM notifier.
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* When a VFIO device is first opened the KVM will be available in
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* device->kvm if one was associated with the group.
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*/
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void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
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{
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@ -1743,8 +1762,6 @@ void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
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down_write(&group->group_rwsem);
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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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up_write(&group->group_rwsem);
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}
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EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
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@ -2011,7 +2028,8 @@ static int vfio_register_iommu_notifier(struct vfio_group *group,
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struct vfio_iommu_driver *driver;
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int ret;
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down_read(&group->group_rwsem);
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lockdep_assert_held_read(&group->group_rwsem);
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container = group->container;
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driver = container->iommu_driver;
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if (likely(driver && driver->ops->register_notifier))
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@ -2019,7 +2037,6 @@ static int vfio_register_iommu_notifier(struct vfio_group *group,
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events, nb);
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else
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ret = -ENOTTY;
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up_read(&group->group_rwsem);
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return ret;
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}
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@ -2031,7 +2048,8 @@ static int vfio_unregister_iommu_notifier(struct vfio_group *group,
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struct vfio_iommu_driver *driver;
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int ret;
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down_read(&group->group_rwsem);
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lockdep_assert_held_read(&group->group_rwsem);
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container = group->container;
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driver = container->iommu_driver;
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||||
if (likely(driver && driver->ops->unregister_notifier))
|
||||
@ -2039,47 +2057,10 @@ static int vfio_unregister_iommu_notifier(struct vfio_group *group,
|
||||
nb);
|
||||
else
|
||||
ret = -ENOTTY;
|
||||
up_read(&group->group_rwsem);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int vfio_register_group_notifier(struct vfio_group *group,
|
||||
unsigned long *events,
|
||||
struct notifier_block *nb)
|
||||
{
|
||||
int ret;
|
||||
bool set_kvm = false;
|
||||
|
||||
if (*events & VFIO_GROUP_NOTIFY_SET_KVM)
|
||||
set_kvm = true;
|
||||
|
||||
/* clear known events */
|
||||
*events &= ~VFIO_GROUP_NOTIFY_SET_KVM;
|
||||
|
||||
/* refuse to continue if still events remaining */
|
||||
if (*events)
|
||||
return -EINVAL;
|
||||
|
||||
ret = blocking_notifier_chain_register(&group->notifier, nb);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* The attaching of kvm and vfio_group might already happen, so
|
||||
* here we replay once upon registration.
|
||||
*/
|
||||
if (set_kvm) {
|
||||
down_read(&group->group_rwsem);
|
||||
if (group->kvm)
|
||||
blocking_notifier_call_chain(&group->notifier,
|
||||
VFIO_GROUP_NOTIFY_SET_KVM,
|
||||
group->kvm);
|
||||
up_read(&group->group_rwsem);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int vfio_register_notifier(struct vfio_device *device,
|
||||
enum vfio_notify_type type, unsigned long *events,
|
||||
struct notifier_block *nb)
|
||||
@ -2095,9 +2076,6 @@ int vfio_register_notifier(struct vfio_device *device,
|
||||
case VFIO_IOMMU_NOTIFY:
|
||||
ret = vfio_register_iommu_notifier(group, events, nb);
|
||||
break;
|
||||
case VFIO_GROUP_NOTIFY:
|
||||
ret = vfio_register_group_notifier(group, events, nb);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
@ -2119,9 +2097,6 @@ int vfio_unregister_notifier(struct vfio_device *device,
|
||||
case VFIO_IOMMU_NOTIFY:
|
||||
ret = vfio_unregister_iommu_notifier(group, nb);
|
||||
break;
|
||||
case VFIO_GROUP_NOTIFY:
|
||||
ret = blocking_notifier_chain_unregister(&group->notifier, nb);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
@ -36,6 +36,8 @@ struct vfio_device {
|
||||
struct vfio_device_set *dev_set;
|
||||
struct list_head dev_set_list;
|
||||
unsigned int migration_flags;
|
||||
/* Driver must reference the kvm during open_device or never touch it */
|
||||
struct kvm *kvm;
|
||||
|
||||
/* Members below here are private, not for driver use */
|
||||
refcount_t refcount;
|
||||
@ -155,15 +157,11 @@ extern int vfio_dma_rw(struct vfio_device *device, dma_addr_t user_iova,
|
||||
/* each type has independent events */
|
||||
enum vfio_notify_type {
|
||||
VFIO_IOMMU_NOTIFY = 0,
|
||||
VFIO_GROUP_NOTIFY = 1,
|
||||
};
|
||||
|
||||
/* events for VFIO_IOMMU_NOTIFY */
|
||||
#define VFIO_IOMMU_NOTIFY_DMA_UNMAP BIT(0)
|
||||
|
||||
/* events for VFIO_GROUP_NOTIFY */
|
||||
#define VFIO_GROUP_NOTIFY_SET_KVM BIT(0)
|
||||
|
||||
extern int vfio_register_notifier(struct vfio_device *device,
|
||||
enum vfio_notify_type type,
|
||||
unsigned long *required_events,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user