linux-kernel - Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit

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Message-ID: <79060ea1-8392-58d7-5a27-ff173e830403@intel.com>
Date:   Fri, 11 Feb 2022 14:00:24 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>
Cc:     iommu@...ts.linux-foundation.org, x86 <x86@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID
 allocation and free it on mm exit

On 2/7/22 15:02, Fenghua Yu wrote:
...
> Get rid of the refcounting mechanisms and replace/rename the interfaces
> to reflect this new approach.
...
>  .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  5 +--
>  drivers/iommu/intel/iommu.c                   |  4 +-
>  drivers/iommu/intel/svm.c                     |  9 -----
>  drivers/iommu/ioasid.c                        | 39 ++-----------------
>  drivers/iommu/iommu-sva-lib.c                 | 39 ++++++-------------
>  drivers/iommu/iommu-sva-lib.h                 |  1 -
>  include/linux/ioasid.h                        | 12 +-----
>  include/linux/sched/mm.h                      | 16 ++++++++
>  kernel/fork.c                                 |  1 +
>  9 files changed, 38 insertions(+), 88 deletions(-)

Given the heavily non-x86 diffstat here, I was hoping to see some acks
from folks that this might affect, especially on the ARM side.

Is everyone OK with this?