netdev - [RFC 4/7] vdpa: change the map/unmap process to support iommufd

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Date: Sun, 24 Sep 2023 01:05:37 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
	jasowang@...hat.com,
	mst@...hat.com,
	yi.l.liu@...el.com,
	jgg@...dia.com,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org
Subject: [RFC 4/7] vdpa: change the map/unmap process to support iommufd

Add the check for iommufd_ictx,If vdpa don't have the iommufd_ictx
then will use the Legacy iommu domain pathway

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vhost/vdpa.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 91da012084e9..8d1ad89d4671 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -981,6 +981,10 @@ static int vhost_vdpa_map(struct vhost_vdpa *v, struct vhost_iotlb *iotlb,
 	} else if (ops->set_map) {
 		if (!v->in_batch)
 			r = ops->set_map(vdpa, asid, iotlb);
+	} else if (!vdpa->iommufd_ictx) {
+		/* Legacy iommu domain pathway without IOMMUFD */
+		r = iommu_map(v->domain, iova, pa, size,
+			      perm_to_iommu_flags(perm));
 	} else {
 		r = iommu_map(v->domain, iova, pa, size,
 			      perm_to_iommu_flags(perm));
@@ -1009,6 +1013,9 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v,
 	if (ops->set_map) {
 		if (!v->in_batch)
 			ops->set_map(vdpa, asid, iotlb);
+	} else if (!vdpa->iommufd_ictx) {
+		/* Legacy iommu domain pathway without IOMMUFD */
+		iommu_unmap(v->domain, iova, size);
 	}
 	/* If we are in the middle of batch processing, delay the free
 	 * of AS until BATCH_END.
@@ -1337,6 +1344,8 @@ static void vhost_vdpa_free_domain(struct vhost_vdpa *v)
 		iommu_detach_device(v->domain, dma_dev);
 		iommu_domain_free(v->domain);
 	}
+	if (vdpa->iommufd_ictx)
+		vdpa_iommufd_unbind(vdpa);
 
 	v->domain = NULL;
 }
@@ -1560,6 +1569,7 @@ static int vhost_vdpa_probe(struct vdpa_device *vdpa)
 	}
 
 	atomic_set(&v->opened, 0);
+	atomic_set(&vdpa->iommufd_users, 0);
 	v->minor = minor;
 	v->vdpa = vdpa;
 	v->nvqs = vdpa->nvqs;
-- 
2.34.3