From: Anup Patel <anup.patel@broadcom.com>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Will Deacon <will.deacon@arm.com>, Joerg Roedel <joro@8bytes.org>,
Baptiste Reynal <b.reynal@virtualopensystems.com>,
Alex Williamson <alex.williamson@redhat.com>,
Scott Branden <sbranden@broadcom.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Linux ARM Kernel <linux-arm-kernel@lists.infradead.org>,
Linux IOMMU <iommu@lists.linux-foundation.org>,
kvm@vger.kernel.org,
BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>
Subject: Re: [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS
Date: Wed, 19 Jul 2017 16:49:00 +0530 [thread overview]
Message-ID: <CAALAos_o25mtphxcVE0rr9dE8YAm-os2C_HD9oDnt41ZMDP8pA@mail.gmail.com> (raw)
In-Reply-To: <675744d3-b070-1245-6ebc-579c4b5f4a75@arm.com>
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
next prev parent reply other threads:[~2017-07-19 11:19 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-19 9:33 [PATCH 0/5] FlexRM support in VFIO platform Anup Patel via iommu
2017-07-19 9:33 ` [PATCH 1/5] iommu: Add capability IOMMU_CAP_BYPASS Anup Patel
[not found] ` <1500456838-18405-2-git-send-email-anup.patel-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2017-07-19 10:58 ` Robin Murphy
2017-07-19 11:19 ` Anup Patel [this message]
[not found] ` <CAALAos_o25mtphxcVE0rr9dE8YAm-os2C_HD9oDnt41ZMDP8pA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-19 11:23 ` Will Deacon
2017-07-19 11:26 ` Anup Patel
[not found] ` <CAALAos8nf-d5i74J7-sAJb2o9eFj2PVDeLLVd=wun+gW1ihXSA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-19 11:29 ` Robin Murphy
2017-07-19 11:30 ` Will Deacon
[not found] ` <20170719113017.GH13642-5wv7dgnIgG8@public.gmane.org>
2017-07-19 11:33 ` Anup Patel via iommu
2017-07-19 9:33 ` [PATCH 2/5] iommu/arm-smmu: add IOMMU_CAP_BYPASS to the ARM SMMU driver Anup Patel
[not found] ` <1500456838-18405-3-git-send-email-anup.patel-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2017-07-19 10:59 ` Robin Murphy
[not found] ` <1500456838-18405-1-git-send-email-anup.patel-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2017-07-19 9:33 ` [PATCH 3/5] iommu/arm-smmu-v3: add IOMMU_CAP_BYPASS to the ARM SMMUv3 driver Anup Patel via iommu
2017-07-19 11:00 ` Robin Murphy
[not found] ` <ace28bd1-2dd3-482c-d11b-539c055ee9b7-5wv7dgnIgG8@public.gmane.org>
2017-07-19 11:23 ` Anup Patel via iommu
[not found] ` <CAALAos8y0kLGrbwgz3u=ZVyteSicuPyQZ3Yp=LPZohXzVaE5NQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-19 11:25 ` Will Deacon
[not found] ` <20170719112524.GF13642-5wv7dgnIgG8@public.gmane.org>
2017-07-19 11:31 ` Anup Patel via iommu
[not found] ` <CAALAos_xGCt7U1Oz5uCf9Q4hP6fdn4fcymFNQP5xO_UBduSY3g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-19 11:33 ` Will Deacon
2017-07-19 11:39 ` Anup Patel
[not found] ` <CAALAos99HWLoW=0P-dvFA+oNsF03TRNzNbfppyQNtqmcRELXXQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-19 11:53 ` Will Deacon
[not found] ` <20170719115333.GJ13642-5wv7dgnIgG8@public.gmane.org>
2017-07-20 4:02 ` Anup Patel via iommu
[not found] ` <CAALAos-YbVbgvPmDYXeWaF4y8MQ9i7CG3tgGuf-QLR6hmXo18Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-20 9:10 ` Will Deacon
[not found] ` <20170720091003.GA17837-5wv7dgnIgG8@public.gmane.org>
2017-07-20 11:08 ` Anup Patel via iommu
[not found] ` <CAALAos8571-UVp7Ky81qFESVcNcWx_H2VOemFt_++NFCxcMg3w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-07-20 11:17 ` Will Deacon
2017-07-20 11:17 ` Robin Murphy
[not found] ` <8e82d8f5-e5e2-dd09-c774-29f9eda2ecdd-5wv7dgnIgG8@public.gmane.org>
2017-07-24 17:16 ` Alex Williamson
[not found] ` <20170724111621.7f1c3a85-DGNDKt5SQtizQB+pC5nmwQ@public.gmane.org>
2017-07-24 17:23 ` Robin Murphy
[not found] ` <6468f359-1682-b9b0-5a4d-72738939cb84-5wv7dgnIgG8@public.gmane.org>
2017-07-24 19:06 ` Alex Williamson
2017-07-25 8:59 ` Anup Patel
2017-07-19 9:33 ` [PATCH 5/5] vfio: platform: reset: Add Broadcom FlexRM reset module Anup Patel via iommu
[not found] ` <1500456838-18405-6-git-send-email-anup.patel-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2017-07-19 16:50 ` Scott Branden via iommu
[not found] ` <27236534-a9fb-53bc-f0c6-eb674833a94e-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2017-07-20 4:05 ` Anup Patel via iommu
2017-07-19 9:33 ` [PATCH 4/5] vfio: Allow No-IOMMU mode for IOMMUs with bypass capability Anup Patel
2017-07-19 10:57 ` [PATCH 0/5] FlexRM support in VFIO platform Robin Murphy
[not found] ` <0dc860ed-a40c-1bfd-f584-225807edb25b-5wv7dgnIgG8@public.gmane.org>
2017-07-19 11:17 ` Anup Patel via iommu
2017-07-19 11:25 ` Robin Murphy
[not found] ` <d4ef45d5-43cc-c632-082d-a92b8681faee-5wv7dgnIgG8@public.gmane.org>
2017-07-19 11:28 ` Anup Patel via iommu
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