netdev - [RFC PATCH 06/24] vhost-vdpa: switch to use vhost-vdpa specific IOTLB

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Date:   Thu, 24 Sep 2020 11:21:07 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     lulu@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, rob.miller@...adcom.com,
        lingshan.zhu@...el.com, eperezma@...hat.com, hanand@...inx.com,
        mhabets@...arflare.com, eli@...lanox.com, amorenoz@...hat.com,
        maxime.coquelin@...hat.com, stefanha@...hat.com,
        sgarzare@...hat.com
Subject: [RFC PATCH 06/24] vhost-vdpa: switch to use vhost-vdpa specific IOTLB

To ease the implementation of per group ASID support for vDPA
device. This patch switches to use a vhost-vdpa specific IOTLB to
avoid the unnecessary refactoring of the vhost core.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vhost/vdpa.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 74bef1c15a70..ec3c94f706c1 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -40,6 +40,7 @@ struct vhost_vdpa {
 	struct vhost_virtqueue *vqs;
 	struct completion completion;
 	struct vdpa_device *vdpa;
+	struct vhost_iotlb *iotlb;
 	struct device dev;
 	struct cdev cdev;
 	atomic_t opened;
@@ -514,12 +515,11 @@ static void vhost_vdpa_iotlb_unmap(struct vhost_vdpa *v,
 
 static void vhost_vdpa_iotlb_free(struct vhost_vdpa *v)
 {
-	struct vhost_dev *dev = &v->vdev;
-	struct vhost_iotlb *iotlb = dev->iotlb;
+	struct vhost_iotlb *iotlb = v->iotlb;
 
 	vhost_vdpa_iotlb_unmap(v, iotlb, 0ULL, 0ULL - 1);
-	kfree(dev->iotlb);
-	dev->iotlb = NULL;
+	kfree(v->iotlb);
+	v->iotlb = NULL;
 }
 
 static int perm_to_iommu_flags(u32 perm)
@@ -681,7 +681,7 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
 	struct vhost_vdpa *v = container_of(dev, struct vhost_vdpa, vdev);
 	struct vdpa_device *vdpa = v->vdpa;
 	const struct vdpa_config_ops *ops = vdpa->config;
-	struct vhost_iotlb *iotlb = dev->iotlb;
+	struct vhost_iotlb *iotlb = v->iotlb;
 	int r = 0;
 
 	r = vhost_dev_check_owner(dev);
@@ -812,12 +812,14 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
 
 	r = vhost_vdpa_alloc_domain(v);
 	if (r)
-		goto err_init_iotlb;
+		goto err_alloc_domain;
 
 	filep->private_data = v;
 
 	return 0;
 
+err_alloc_domain:
+	vhost_vdpa_iotlb_free(v);
 err_init_iotlb:
 	vhost_vdpa_cleanup(v);
 err:
-- 
2.20.1