linux-kernel - Re: [RFC PATCH v1 2/8] iommu/arm-smmu-v3: Perform invalidations over installed

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Date:   Fri, 18 Aug 2023 11:44:55 +0800
From:   Michael Shavit <mshavit@...gle.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Jason Gunthorpe <jgg@...dia.com>, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        will@...nel.org, nicolinc@...dia.com, tina.zhang@...el.com,
        jean-philippe@...aro.org
Subject: Re: [RFC PATCH v1 2/8] iommu/arm-smmu-v3: Perform invalidations over installed_smmus

On Fri, Aug 18, 2023 at 3:41 AM Robin Murphy <robin.murphy@....com> wrote:
>
> On 2023-08-17 20:20, Jason Gunthorpe wrote:
> > It is certainly wrong to skip invalidations generated for any other
> > reason.
> >
> >  From what I can tell SVA domains should have their CD table entry
> > programmed with "ASET=0" and normal paging domains should be
> > programmed with "ASET=1". This causes only the SVA domains to listen
> > to the BTM invalidations.
>
> Correct.
>
> Thanks,
> Robin.

Would it be fair to rename arm_smmu_tlb_inv_asid (or move into
arm-smmu-v3-sva) to make it explicit that it shouldn't be used outside
of SVA then? Or add a parameter such as skip_btm_capable_devices.