From: robin.murphy@arm•com (Robin Murphy)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 5/5] iommu: Allow default domain type to be set on the kernel command line
Date: Thu, 26 Jan 2017 17:26:32 +0000 [thread overview]
Message-ID: <5717f26c-44ee-2057-e7dc-8dca42e3cd88@arm.com> (raw)
In-Reply-To: <20170126171555.GD27598@8bytes.org>
On 26/01/17 17:15, Joerg Roedel wrote:
> On Thu, Jan 19, 2017 at 06:19:15PM +0000, Will Deacon wrote:
>> Rather than modify each IOMMU driver to provide different semantics for
>> DMA domains, instead we introduce a command line parameter that can be
>> used to change the type of the default domain. Passthrough can then be
>> specified using "iommu.default_domain=identity" on the kernel command
>> line.
>
> I like the general idea of this, but the above is a terrible name for a
> kernel commandline-parameter. The x86 iommus support iommu=pt which is
> pretty much the same as this patch does.
Indeed, I was keen on making "iommu=pt" also do this default domain
switch itself so we wouldn't need a new option - it didn't *appear* that
that would break the AMD driver (as the only other default domain user
supporting identity domains) but I may have overlooked something.
Robin.
> How about something like "iommu.passthrough=0/1"? And please add the
> parameter to the kernel documentation too.
>
>
> Joerg
>
next prev parent reply other threads:[~2017-01-26 17:26 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-19 18:19 [PATCH 0/5] Implement SMMU passthrough using the default domain Will Deacon
2017-01-19 18:19 ` [PATCH 1/5] iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains Will Deacon
2017-01-19 18:41 ` Robin Murphy
2017-01-26 17:06 ` Joerg Roedel
2017-01-26 17:03 ` Joerg Roedel
2017-01-26 17:57 ` Will Deacon
2017-01-19 18:19 ` [PATCH 2/5] iommu/arm-smmu: Install bypass S2CRs for IOMMU_DOMAIN_IDENTITY domains Will Deacon
2017-01-19 18:50 ` Robin Murphy
2017-01-19 18:19 ` [PATCH 3/5] iommu/arm-smmu-v3: Install bypass STEs " Will Deacon
2017-01-19 18:56 ` Robin Murphy
2017-01-19 18:19 ` [PATCH 4/5] arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA Will Deacon
2017-01-19 19:00 ` Robin Murphy
2017-01-26 17:57 ` Will Deacon
2017-01-19 18:19 ` [PATCH 5/5] iommu: Allow default domain type to be set on the kernel command line Will Deacon
2017-01-26 17:15 ` Joerg Roedel
2017-01-26 17:26 ` Robin Murphy [this message]
2017-01-26 17:48 ` Will Deacon
2017-01-24 15:12 ` [PATCH 0/5] Implement SMMU passthrough using the default domain Sricharan
2017-01-26 17:18 ` Joerg Roedel
2017-02-02 15:02 ` Rob Clark
2017-02-02 15:12 ` Will Deacon
2017-02-03 12:20 ` Rob Clark
2017-02-02 15:45 ` Sricharan
2017-02-02 16:10 ` Will Deacon
2017-02-03 16:33 ` Sricharan
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