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SubjectRe: [RFC PATCH 06/24] vhost-vdpa: switch to use vhost-vdpa specific IOTLB
On Thu, Sep 24, 2020 at 11:21:07AM +0800, Jason Wang wrote:
> 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@redhat.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;

You're still using this:
dev->iotlb = vhost_iotlb_alloc(0, 0);

Shouldn't you use
v->iotlb = host_iotlb_alloc(0, 0);

to set the vdpa device iotlb field?

>
> 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
>

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