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

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Message-ID: <20230925134506.GB13733@nvidia.com>
Date:   Mon, 25 Sep 2023 10:45:06 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Cindy Lu <lulu@...hat.com>
Cc:     jasowang@...hat.com, mst@...hat.com, yi.l.liu@...el.com,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC 4/7] vdpa: change the map/unmap process to support iommufd

On Sun, Sep 24, 2023 at 01:05:37AM +0800, Cindy Lu wrote:
> 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));

Um, why is the 2nd else the same as the new one?

Jason