Re: [PATCH 3/9] vfio/mdev: Pass in a struct vfio_device * to vfio_pin/unpin_pages()

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On 4/12/22 11:53, Jason Gunthorpe wrote:
Every caller has a readily available vfio_device pointer, use that instead
of passing in a generic struct device. The struct vfio_device already
contains the group we need so this avoids complexity, extra refcountings,
and a confusing lifecycle model.
...
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 69768061cd7bd9..a10b3369d76c41 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -124,7 +124,7 @@ static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
  		q->saved_isc = VFIO_AP_ISC_INVALID;
  	}
  	if (q->saved_pfn && !WARN_ON(!q->matrix_mdev)) {
-		vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev),
+		vfio_unpin_pages(&q->matrix_mdev->vdev,
  				 &q->saved_pfn, 1);

Could be contracted to a single line. If you feel like it :)

  		q->saved_pfn = 0;
  	}
@@ -258,7 +258,7 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
  		return status;
  	}
- ret = vfio_pin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1,
+	ret = vfio_pin_pages(&q->matrix_mdev->vdev, &g_pfn, 1,
  			     IOMMU_READ | IOMMU_WRITE, &h_pfn);
  	switch (ret) {
  	case 1:
@@ -301,7 +301,7 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
  		break;
  	case AP_RESPONSE_OTHERWISE_CHANGED:
  		/* We could not modify IRQ setings: clear new configuration */
-		vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1);
+		vfio_unpin_pages(&q->matrix_mdev->vdev, &g_pfn, 1);
  		kvm_s390_gisc_unregister(kvm, isc);
  		break;
  	default:
@@ -1250,7 +1250,7 @@ static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
  		struct vfio_iommu_type1_dma_unmap *unmap = data;
  		unsigned long g_pfn = unmap->iova >> PAGE_SHIFT;
- vfio_unpin_pages(mdev_dev(matrix_mdev->mdev), &g_pfn, 1);
+		vfio_unpin_pages(&matrix_mdev->vdev, &g_pfn, 1);
  		return NOTIFY_OK;
  	}

Looks good to me.
Reviewed-by: Jason J. Herne <jjherne@xxxxxxxxxxxxx>

--
-- Jason J. Herne (jjherne@xxxxxxxxxxxxx)



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