Register the VFIO_IRQ_TYPE_NESTED/VFIO_IRQ_SUBTYPE_DMA_FAULT IRQ that allows to signal a nested mode DMA fault. Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx> --- drivers/vfio/pci/vfio_pci.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index dcc246202094..a9df964e40c6 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -344,7 +344,7 @@ int vfio_pci_iommu_dev_fault_handler(struct iommu_fault *fault, void *data) struct iommu_fault *new = (struct iommu_fault *)(vdev->fault_pages + reg->offset + reg->head * reg->entry_size); - int head, tail, size; + int head, tail, size, ext_irq_index; int ret = 0; if (fault->type != IOMMU_FAULT_DMA_UNRECOV) @@ -365,7 +365,19 @@ int vfio_pci_iommu_dev_fault_handler(struct iommu_fault *fault, void *data) reg->head = (head + 1) % size; unlock: mutex_unlock(&vdev->fault_queue_lock); - return ret; + 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 @@ -518,6 +530,12 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev) if (ret) goto disable_exit; + ret = vfio_pci_register_irq(vdev, VFIO_IRQ_TYPE_NESTED, + VFIO_IRQ_SUBTYPE_DMA_FAULT, + VFIO_IRQ_INFO_EVENTFD); + if (ret) + goto disable_exit; + vfio_pci_probe_mmaps(vdev); return 0; -- 2.20.1
