linux-kernel - Re: [PATCH v2] vhost/vdpa: Add MSI translation tables to iommu for software-managed MSI

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Message-ID: <ZBw4hGj8oGARaKhW@nvidia.com>
Date:   Thu, 23 Mar 2023 08:31:16 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nanyong Sun <sunnanyong@...wei.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, joro@...tes.org,
        will@...nel.org, robin.murphy@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        wangrong68@...wei.com, Cindy Lu <lulu@...hat.com>
Subject: Re: [PATCH v2] vhost/vdpa: Add MSI translation tables to iommu for
 software-managed MSI

On Thu, Mar 23, 2023 at 05:22:36PM +0800, Nanyong Sun wrote:
> > A patch to export that function is alread posted:
> > 
> > https://lore.kernel.org/linux-iommu/BN9PR11MB52760E9705F2985EACCD5C4A8CBA9@BN9PR11MB5276.namprd11.prod.outlook.com/T/#u
> > 
> > But I do not want VDPA to mis-use it unless it also implements all the
> > ownership stuff properly.
> > 

> I want to confirm if we need to introduce iommu group logic to vdpa, as "all
> the ownership stuff" ?

You have to call iommu_device_claim_dma_owner()

But again, this is all pointless, iommufd takes are of all of this and
VDPA should switch to it instead of more hacking.

Jason