linux-kernel - RE: [PATCH v2 03/10] iommufd: Create access in vfio_iommufd_emulated

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Date:   Thu, 9 Feb 2023 02:56:39 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
Subject: RE: [PATCH v2 03/10] iommufd: Create access in
 vfio_iommufd_emulated_bind()

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Wednesday, February 8, 2023 5:18 AM
>
> @@ -141,10 +141,19 @@ static const struct iommufd_access_ops
> vfio_user_ops = {
>  int vfio_iommufd_emulated_bind(struct vfio_device *vdev,
>  			       struct iommufd_ctx *ictx, u32 *out_device_id)
>  {
> +	struct iommufd_access *user;
> +
>  	lockdep_assert_held(&vdev->dev_set->lock);
> 
> -	vdev->iommufd_ictx = ictx;
>  	iommufd_ctx_get(ictx);
> +	user = iommufd_access_create(vdev->iommufd_ictx, &vfio_user_ops,
> vdev);
> +	if (IS_ERR(user)) {
> +		iommufd_ctx_put(vdev->iommufd_ictx);
> +		return PTR_ERR(user);
> +	}
> +	iommufd_access_set_ioas(user, 0);

this is not required since ioas has been NULL after creation.

otherwise,

Reviewed-by: Kevin Tian <kevin.tian@...el.com>