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Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS

From Anup Patel <anup.patel@broadcom.com>
Newsgroups linux.kernel
Subject Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS
Date 2017-07-19 13:20 +0200
Message-ID <u4Vbl-7Nz-31@gated-at.bofh.it> (permalink)
References <u4TCy-6D1-9@gated-at.bofh.it> <u4TCz-6D1-39@gated-at.bofh.it> <u4URX-7qy-7@gated-at.bofh.it>
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On Wed, Jul 19, 2017 at 4:28 PM, Robin Murphy <robin.murphy@arm.com> wrote:
> On 19/07/17 10:33, Anup Patel wrote:
>> Some of the IOMMUs (such as ARM SMMU) are capable of bypassing
>> transactions for which no IOMMU domain is configured.
>>
>> This patch adds IOMMU_CAP_BYPASS which can be used by IOMMU
>> drivers to advertise transation bypass capability of an IOMMU.
>
> Whatever the intended semantics of this are, I can't help thinking it
> would be better served by allowing callers to explicitly allocate their
> own IOMMU_DOMAIN_IDENTITY domains. That would also be useful for the
> problem we have with legacy virtio devices behind real IOMMUs.

We want to use VFIO no-IOMMU mode for FlexRM device but
currently it does not allow on our SOC because IOMMU ops are
registered for platform bus.

Regards,
Anup

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[PATCH 0/5] FlexRM support in VFIO platform Anup Patel <anup.patel@broadcom.com> - 2017-07-19 11:40 +0200
  [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Anup Patel <anup.patel@broadcom.com> - 2017-07-19 11:40 +0200
    Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Robin Murphy <robin.murphy@arm.com> - 2017-07-19 13:00 +0200
      Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Anup Patel <anup.patel@broadcom.com> - 2017-07-19 13:20 +0200
        Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Robin Murphy <robin.murphy@arm.com> - 2017-07-19 13:30 +0200
        Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Will Deacon <will.deacon@arm.com> - 2017-07-19 13:30 +0200
          Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Anup Patel <anup.patel@broadcom.com> - 2017-07-19 13:30 +0200
            Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Anup Patel <anup.patel@broadcom.com> - 2017-07-19 13:40 +0200
            Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Will Deacon <will.deacon@arm.com> - 2017-07-19 13:40 +0200
  [PATCH 2/5] iommu/arm-smmu: add IOMMU_CAP_BYPASS to the ARM SMMU driver Anup Patel <anup.patel@broadcom.com> - 2017-07-19 11:40 +0200
    Re: [PATCH 2/5] iommu/arm-smmu: add IOMMU_CAP_BYPASS to the ARM SMMU  driver Robin Murphy <robin.murphy@arm.com> - 2017-07-19 13:00 +0200
  Re: [PATCH 0/5] FlexRM support in VFIO platform Robin Murphy <robin.murphy@arm.com> - 2017-07-19 13:00 +0200
    Re: [PATCH 0/5] FlexRM support in VFIO platform Anup Patel <anup.patel@broadcom.com> - 2017-07-19 13:20 +0200
      Re: [PATCH 0/5] FlexRM support in VFIO platform Robin Murphy <robin.murphy@arm.com> - 2017-07-19 13:30 +0200
        Re: [PATCH 0/5] FlexRM support in VFIO platform Anup Patel <anup.patel@broadcom.com> - 2017-07-19 13:30 +0200

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