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Message-ID: <ZTtixEgSkBI-TRro@8bytes.org>
Date: Fri, 27 Oct 2023 09:12:04 +0200
From: Joerg Roedel <joro@...tes.org>
To: Tina Zhang <tina.zhang@...el.com>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
David Woodhouse <dwmw2@...radead.org>,
Lu Baolu <baolu.lu@...ux.intel.com>,
Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Jason Gunthorpe <jgg@...pe.ca>,
Kevin Tian <kevin.tian@...el.com>,
Nicolin Chen <nicolinc@...dia.com>,
Michael Shavit <mshavit@...gle.com>,
Vasant Hegde <vasant.hegde@....com>,
Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [PATCH v10 1/6] iommu: Change kconfig around IOMMU_SVA
Hi Tina,
On Fri, Oct 27, 2023 at 08:05:20AM +0800, Tina Zhang wrote:
> From: Jason Gunthorpe <jgg@...dia.com>
>
> Linus suggested that the kconfig here is confusing:
While this patch looks decent to me, you forgot to Cc Linus on it. In
general, given that it touches a couple of core files, I'd like to wait
for some more people to have a look at it and not rushing anything in.
>
> https://lore.kernel.org/all/CAHk-=wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanFhUgvUqjr9Xw@mail.gmail.com/
>
> Let's break it into three kconfigs controlling distinct things:
>
> - CONFIG_IOMMU_MM_DATA controls if the mm_struct has the additional
> fields for the IOMMU. Currently only PASID, but later patches store
> a struct iommu_mm_data *
>
> - CONFIG_ARCH_HAS_CPU_PASID controls if the arch needs the scheduling bit
> for keeping track of the ENQCMD instruction. x86 will select this if
> IOMMU_SVA is enabled
>
> - IOMMU_SVA controls if the IOMMU core compiles in the SVA support code
> for iommu driver use and the IOMMU exported API
>
> This way ARM will not enable CONFIG_ARCH_HAS_CPU_PASID
>
> Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
If you send it, you also need to add your Signed-off-by.
Regards,
Joerg
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