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Message-ID: <ZxvEnGCNYJZYTwf2@Asurada-Nvidia>
Date: Fri, 25 Oct 2024 09:17:32 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
CC: "jgg@...dia.com" <jgg@...dia.com>, "will@...nel.org" <will@...nel.org>,
	"joro@...tes.org" <joro@...tes.org>, "suravee.suthikulpanit@....com"
	<suravee.suthikulpanit@....com>, "robin.murphy@....com"
	<robin.murphy@....com>, "dwmw2@...radead.org" <dwmw2@...radead.org>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>, "shuah@...nel.org"
	<shuah@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "jean-philippe@...aro.org"
	<jean-philippe@...aro.org>, "mdf@...nel.org" <mdf@...nel.org>,
	"mshavit@...gle.com" <mshavit@...gle.com>,
	"shameerali.kolothum.thodi@...wei.com"
	<shameerali.kolothum.thodi@...wei.com>, "smostafa@...gle.com"
	<smostafa@...gle.com>, "Liu, Yi L" <yi.l.liu@...el.com>, "aik@....com"
	<aik@....com>, "zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>,
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: Re: [PATCH v4 04/11] iommufd/viommu: Add IOMMU_VIOMMU_ALLOC ioctl

On Fri, Oct 25, 2024 at 09:05:58AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Tuesday, October 22, 2024 8:19 AM
> > +
> > +     viommu->type = cmd->type;
> > +     viommu->ictx = ucmd->ictx;
> > +     viommu->hwpt = hwpt_paging;
> > +     /* Assume physical IOMMUs are unpluggable (the most likely case)
> > */
> > +     viommu->iommu_dev = __iommu_get_iommu_dev(idev->dev);
> > +
> 
> so what would happen if this assumption breaks?

I had a very verbose comments previously that Alexey suggested to
optimize away.. Perhaps I should add back the part that mentions
adding a refcount for pluggable ones..

Nicolin

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