linux-kernel - Re: [PATCH v6 0/1] iommu: enhance IOMMU dma mode build options

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Message-ID: <5CCD50E7.3070505@huawei.com>
Date:   Sat, 4 May 2019 16:44:23 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        John Garry <john.garry@...wei.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jonathan Corbet <corbet@....net>,
        linux-doc <linux-doc@...r.kernel.org>,
        Sebastian Ott <sebott@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        "Martin Schwidefsky" <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        David Woodhouse <dwmw2@...radead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        x86 <x86@...nel.org>, linux-ia64 <linux-ia64@...r.kernel.org>
CC:     Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v6 0/1] iommu: enhance IOMMU dma mode build options

Hi all,
  Can anybody review or comment?


On 2019/4/18 21:57, Zhen Lei wrote:
> v5 --> v6:
> 1. give up adding boot option iommu.dma_mode
> 
> v4 --> v5:
> As Hanjun and Thomas Gleixner's suggestion:
> 1. Keep the old ARCH specific boot options no change.
> 2. Keep build option CONFIG_IOMMU_DEFAULT_PASSTHROUGH no change.
> 
> v4:
> As Robin Murphy's suggestion:
> "It's also not necessarily obvious to the user how this interacts with
> IOMMU_DEFAULT_PASSTHROUGH, so if we really do go down this route, maybe it
> would be better to refactor the whole lot into a single selection of something
> like IOMMU_DEFAULT_MODE anyway."
> 
> In this version, I tried to normalize the IOMMU dma mode boot options for all
> ARCHs. When IOMMU is enabled, there are 3 dma modes: paasthrough(bypass),
> lazy(mapping but defer the IOTLB invalidation), strict. But currently each
> ARCHs defined their private boot options, different with each other. For
> example, to enable/disable "passthrough", ARM64 use iommu.passthrough=1/0,
> X86 use iommu=pt/nopt, PPC/POWERNV use iommu=nobypass.
> 
> Zhen Lei (1):
>   iommu: enhance IOMMU dma mode build options
> 
>  arch/ia64/kernel/pci-dma.c                |  2 +-
>  arch/powerpc/platforms/powernv/pci-ioda.c |  3 ++-
>  arch/s390/pci/pci_dma.c                   |  2 +-
>  arch/x86/kernel/pci-dma.c                 |  7 ++---
>  drivers/iommu/Kconfig                     | 44 ++++++++++++++++++++++++++-----
>  drivers/iommu/amd_iommu_init.c            |  3 ++-
>  drivers/iommu/intel-iommu.c               |  2 +-
>  drivers/iommu/iommu.c                     |  3 ++-
>  8 files changed, 48 insertions(+), 18 deletions(-)
> 

-- 
Thanks!
BestRegards