linux-kernel - Re: [PATCH 1/5] iommu: Add mm_get

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Message-ID: <ZNOHFKbkQ75owuwC@ziepe.ca>
Date:   Wed, 9 Aug 2023 09:31:16 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     "Zhang, Tina" <tina.zhang@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Michael Shavit <mshavit@...gle.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] iommu: Add mm_get_pasid() helper function

On Wed, Aug 09, 2023 at 09:47:15AM +0000, Tian, Kevin wrote:
> > From: Jason Gunthorpe <jgg@...pe.ca>
> > Sent: Tuesday, August 8, 2023 11:02 PM
> > 
> > On Tue, Aug 08, 2023 at 03:49:40PM +0800, Tina Zhang wrote:
> > > mm_get_pasid() is for getting mm pasid value.
> > >
> > > The motivation is to replace mm->pasid with an iommu private data
> > > structure that is introduced in a later patch.
> > 
> > Maybe we should start out by calling it what it actually is:
> > 
> > 'mm_get_enqcmd_pasid()'
> > 
> > We can't actually have multiple SVA domains with different PASIDs
> > until the places wrongly calling this are removed :\
> > 
> 
> it's kind of egg-chicken problem. mm_get_pasid() is used by all SVA
> scenarios beyond enqcmd then calling it mm_get_enqcmd_pasid()
> also sounds weird for non-enqcmd case.

Well, those are wrong. We need to be fixing them not hide our eyes to
the wrongness.

Michael is cooking a fix for ARM, Tina should come with a fix for
Intel in this series.

Jason