Commit b6f29e4d authored by Eric Auger's avatar Eric Auger Committed by Zheng Zengkai
Browse files

vfio/pci: Register and allow DMA FAULT IRQ signaling 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I401IF


CVE: NA

------------------------------

Register the VFIO_IRQ_TYPE_NESTED/VFIO_IRQ_SUBTYPE_DMA_FAULT
IRQ that allows to signal a nested mode DMA fault.

Signed-off-by: default avatarEric Auger <eric.auger@redhat.com>
Signed-off-by: default avatarKunkun <Jiang&lt;jiangkunkun@huawei.com>
Reviewed-by: default avatarKeqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 31ed6dc2

drivers/vfio/pci/vfio_pci.c

+20 −1
Original line number Diff line number Diff line
@@ -396,6 +396,7 @@ vfio_pci_iommu_dev_fault_handler(struct iommu_fault *fault, void *data) 
		(struct vfio_region_dma_fault *)vdev->fault_pages;

	struct iommu_fault *new;

	u32 head, tail, size;

	int ext_irq_index;

	int ret = -EINVAL;



	if (WARN_ON(!reg))
@@ -420,7 +421,19 @@ vfio_pci_iommu_dev_fault_handler(struct iommu_fault *fault, void *data) 
	ret = 0;

unlock:

	mutex_unlock(&vdev->fault_queue_lock);

	if (ret)

		return ret;



	ext_irq_index = vfio_pci_get_ext_irq_index(vdev, VFIO_IRQ_TYPE_NESTED,

						   VFIO_IRQ_SUBTYPE_DMA_FAULT);

	if (ext_irq_index < 0)

		return -EINVAL;



	mutex_lock(&vdev->igate);

	if (vdev->ext_irqs[ext_irq_index].trigger)

		eventfd_signal(vdev->ext_irqs[ext_irq_index].trigger, 1);

	mutex_unlock(&vdev->igate);

	return 0;

}



#define DMA_FAULT_RING_LENGTH 512
@@ -475,6 +488,12 @@ static int vfio_pci_dma_fault_init(struct vfio_pci_device *vdev) 
	if (ret) /* the dma fault region is freed in vfio_pci_disable() */

		goto out;



	ret = vfio_pci_register_irq(vdev, VFIO_IRQ_TYPE_NESTED,

				    VFIO_IRQ_SUBTYPE_DMA_FAULT,

				    VFIO_IRQ_INFO_EVENTFD);

	if (ret) /* the fault handler is also freed in vfio_pci_disable() */

		goto out;



	return 0;

out:

	kfree(vdev->fault_pages);