From: Will Deacon <will@kernel.org>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Will Deacon <will.deacon@arm.com>,
iommu@lists.linux-foundation.org,
Robin Murphy <robin.murphy@arm.com>,
Ashok Raj <ashok.raj@intel.com>, Christoph Hellwig <hch@lst.de>
Subject: Re: [Patch V8 3/3] iommu: Document usage of "/sys/kernel/iommu_groups/<grp_id>/type" file
Date: Thu, 19 Nov 2020 08:55:30 +0000 [thread overview]
Message-ID: <20201119085529.GB3599@willie-the-truck> (raw)
In-Reply-To: <7eeae289-070f-c5c9-aff5-edbb8437ef69@linux.intel.com>
Hi Lu,
On Thu, Nov 19, 2020 at 10:32:43AM +0800, Lu Baolu wrote:
> On 11/18/20 9:51 PM, Will Deacon wrote:
> > On Fri, Sep 25, 2020 at 12:06:20PM -0700, Ashok Raj wrote:
> > I can't figure out from this description what string is returned to
> > userspace in the case that the group is configured as blocked or unmanaged.
>
> This series only enables switching a default domain in use between DMA
> and IDENTITY. Other cases will result in write failures.
I understood that from the text, but what I couldn't figure out is what
happens if you *read* the file when the default domain is not identity
or DMA. I think that should be documented.
Will
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next prev parent reply other threads:[~2020-11-19 8:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-25 19:06 [Patch V8 0/3] iommu: Add support to change default domain of an iommu group Ashok Raj
2020-09-25 19:06 ` [Patch V8 1/3] " Ashok Raj
2020-11-18 13:51 ` Will Deacon
2020-11-19 2:18 ` Lu Baolu
2020-11-19 8:53 ` Will Deacon
2020-11-20 2:11 ` Lu Baolu
2020-11-20 11:03 ` Will Deacon
2020-11-20 11:27 ` Shameerali Kolothum Thodi
2020-11-20 13:09 ` Lu Baolu
2020-09-25 19:06 ` [Patch V8 2/3] iommu: Take lock before reading iommu group default domain type Ashok Raj
2020-09-25 19:06 ` [Patch V8 3/3] iommu: Document usage of "/sys/kernel/iommu_groups/<grp_id>/type" file Ashok Raj
2020-11-18 13:51 ` Will Deacon
2020-11-19 2:32 ` Lu Baolu
2020-11-19 8:55 ` Will Deacon [this message]
2020-11-20 2:13 ` Lu Baolu
2020-10-01 12:58 ` [Patch V8 0/3] iommu: Add support to change default domain of an iommu group Joerg Roedel
2020-10-01 13:51 ` Raj, Ashok
2020-11-18 13:52 ` Will Deacon
2020-11-19 2:36 ` Lu Baolu
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