linux-kernel - Re: [git pull] IOMMU Updates for Linux v6.4

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Message-ID: <20230505210900.0764fa83@jacob-builder>
Date:   Fri, 5 May 2023 21:09:00 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [git pull] IOMMU Updates for Linux v6.4

Hi Jason,

On Sun, 30 Apr 2023 20:06:30 -0300, Jason Gunthorpe <jgg@...pe.ca> wrote:

> We've had this longstanding confusion in the iommu layer that SVA and
> PASID are one and the same thing, we are slowly reorganizing it.. For
> now it is fine for IOMMU_SVA to cover the PASID allocator as the only
> drivers that support PASID also support SVA.
> 
> Arguably the design is backwards and IOMMU_SVA should be user
> selectable and it should turn off the SVA code entirely including the
> driver code.
> 
> > Somebody should double-check my result, in other words.  
> 
> I didn't notice anything wrong, I'm sure Lu and Yi will test it!
FWIW, I did a quick test with SVA ENQCMD on an Intel Data Streaming
Accelerator (DSA) shared work queue, seems to work fine. Code looks good to
me too.

Thanks,

Jacob