linux-kernel - RE: [PATCH v2 06/19] iommufd/viommu: Add IOMMU_VIOMMU_SET/UNSET_VDEV

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Message-ID: <BL1PR11MB527144A489C069EAB8FB99578C9B2@BL1PR11MB5271.namprd11.prod.outlook.com>
Date: Wed, 11 Sep 2024 06:19:10 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, Jason Gunthorpe <jgg@...dia.com>
CC: "Williams, Dan J" <dan.j.williams@...el.com>, "will@...nel.org"
	<will@...nel.org>, "joro@...tes.org" <joro@...tes.org>,
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	<linux-kernel@...r.kernel.org>, "iommu@...ts.linux.dev"
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	<smostafa@...gle.com>, "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH v2 06/19] iommufd/viommu: Add
 IOMMU_VIOMMU_SET/UNSET_VDEV_ID ioctl

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Friday, September 6, 2024 4:15 AM
> 
> On Thu, Sep 05, 2024 at 02:43:26PM -0300, Jason Gunthorpe wrote:
> > On Thu, Sep 05, 2024 at 10:37:45AM -0700, Nicolin Chen wrote:
> > > That being said, if we have a clear picture that in the long term
> > > we would extend it to hold more information, I think it could be
> > > a smart move.
> > >
> > > Perhaps virtual device can have its own "attach" to vIOMMU? Or
> > > would you still prefer attaching via proxy hwpt_nested?
> >
> > I was thinking just creating it against a vIOMMU is an effective
> > "attach" and the virtual device is permanently tied to the vIOMMU at
> > creation time.
> 
> Ah, right! The create is per-viommu, so it's being attached.
> 

presumably we also need check compatibility between the idev
which the virtual device is created against and the stage-2 pgtable,
as a normal attach required?