From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH 5/5] iommu: Allow default domain type to be set on the kernel command line
Date: Thu, 26 Jan 2017 18:15:55 +0100 [thread overview]
Message-ID: <20170126171555.GD27598@8bytes.org> (raw)
In-Reply-To: <1484849955-1871-6-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
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.
How about something like "iommu.passthrough=0/1"? And please add the
parameter to the kernel documentation too.
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: joro@8bytes.org (Joerg Roedel)
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 18:15:55 +0100 [thread overview]
Message-ID: <20170126171555.GD27598@8bytes.org> (raw)
In-Reply-To: <1484849955-1871-6-git-send-email-will.deacon@arm.com>
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.
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 17:15 UTC|newest]
Thread overview: 50+ 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 ` Will Deacon
[not found] ` <1484849955-1871-1-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2017-01-19 18:19 ` [PATCH 1/5] iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains Will Deacon
2017-01-19 18:19 ` Will Deacon
[not found] ` <1484849955-1871-2-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2017-01-19 18:41 ` Robin Murphy
2017-01-19 18:41 ` Robin Murphy
[not found] ` <89d795b9-a6d7-7f41-705c-b918ee66ebf0-5wv7dgnIgG8@public.gmane.org>
2017-01-26 17:06 ` Joerg Roedel
2017-01-26 17:06 ` Joerg Roedel
2017-01-26 17:03 ` Joerg Roedel
2017-01-26 17:03 ` Joerg Roedel
[not found] ` <20170126170329.GB27598-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-01-26 17:57 ` Will Deacon
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 18:19 ` Will Deacon
2017-01-19 18:50 ` Robin Murphy
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 18:19 ` Will Deacon
[not found] ` <1484849955-1871-4-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2017-01-19 18:56 ` Robin Murphy
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 18:19 ` Will Deacon
[not found] ` <1484849955-1871-5-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2017-01-19 19:00 ` Robin Murphy
2017-01-19 19:00 ` Robin Murphy
2017-01-26 17:57 ` Will Deacon
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
2017-01-19 18:19 ` Will Deacon
[not found] ` <1484849955-1871-6-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2017-01-26 17:15 ` Joerg Roedel [this message]
2017-01-26 17:15 ` Joerg Roedel
[not found] ` <20170126171555.GD27598-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-01-26 17:26 ` Robin Murphy
2017-01-26 17:26 ` Robin Murphy
2017-01-26 17:48 ` Will Deacon
2017-01-26 17:48 ` Will Deacon
2017-01-24 15:12 ` [PATCH 0/5] Implement SMMU passthrough using the default domain Sricharan
2017-01-24 15:12 ` Sricharan
2017-01-26 17:18 ` Joerg Roedel
2017-01-26 17:18 ` Joerg Roedel
[not found] ` <20170126171857.GE27598-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-02-02 15:02 ` Rob Clark
2017-02-02 15:02 ` Rob Clark
[not found] ` <CAF6AEGtfrrwVZ_W86_HqVsiqfcM=XFa+g2LECFYQJmvv7-JSqQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-02-02 15:12 ` Will Deacon
2017-02-02 15:12 ` Will Deacon
[not found] ` <20170202151241.GE13839-5wv7dgnIgG8@public.gmane.org>
2017-02-03 12:20 ` Rob Clark
2017-02-03 12:20 ` Rob Clark
2017-02-02 15:45 ` Sricharan
2017-02-02 15:45 ` Sricharan
2017-02-02 16:10 ` Will Deacon
2017-02-02 16:10 ` Will Deacon
[not found] ` <20170202161047.GG13839-5wv7dgnIgG8@public.gmane.org>
2017-02-03 16:33 ` Sricharan
2017-02-03 16:33 ` Sricharan
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