From: "Prakhya, Sai Praneeth" <sai.praneeth.prakhya@intel.com>
To: Lu Baolu <baolu.lu@linux.intel.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>
Cc: "Raj, Ashok" <ashok.raj@intel.com>,
Will Deacon <will.deacon@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>
Subject: RE: [PATCH V3 0/3] iommu: Add support to change default domain of an iommu
Date: Fri, 29 May 2020 04:46:38 +0000 [thread overview]
Message-ID: <FFF73D592F13FD46B8700F0A279B802F573BC680@ORSMSX114.amr.corp.intel.com> (raw)
In-Reply-To: <c863a340-906e-5040-19e7-aec5136c2a45@linux.intel.com>
Hi Baolu,
> -----Original Message-----
> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Thursday, May 28, 2020 6:52 PM
> To: Prakhya, Sai Praneeth <sai.praneeth.prakhya@intel.com>;
> iommu@lists.linux-foundation.org
> Cc: baolu.lu@linux.intel.com; Christoph Hellwig <hch@lst.de>; Joerg Roedel
> <joro@8bytes.org>; Raj, Ashok <ashok.raj@intel.com>; Will Deacon
> <will.deacon@arm.com>; Mehta, Sohil <sohil.mehta@intel.com>; Robin
> Murphy <robin.murphy@arm.com>; Jacob Pan <jacob.jun.pan@linux.intel.com>
> Subject: Re: [PATCH V3 0/3] iommu: Add support to change default domain of
> an iommu
>
> Hi Sai,
>
> On 5/29/20 3:23 AM, Sai Praneeth Prakhya wrote:
> > Presently, the default domain of a iommu group is allocated during
> > boot time and it cannot be changed later. So, the device would
> > typically be either in identity
> > (pass_through) mode or the device would be in DMA mode as long as the
> > system is up and running. There is no way to change the default domain
> > type dynamically i.e. after booting, a device cannot switch between identity
> mode and DMA mode.
> >
> > Assume a use case wherein the privileged user would want to use the
> > device in pass-through mode when the device is used for host so that
> > it would be high performing. Presently, this is not supported. Hence
> > add support to change the default domain of an iommu group dynamically.
> >
> > Support this by writing to a sysfs file, namely
> > "/sys/kernel/iommu_groups/<grp_id>/type".
>
> The email subject
>
> [PATCH V3 0/3] iommu: Add support to change default domain of an iommu
>
> probably should be changed to
>
> [PATCH V3 0/3] iommu: Add support to change default domain of an iommu
> group
Oops.. my bad. I have it in the patches that I have on my dev machine. I added "group" to a new line because the subject line crossed 80 character limit. Probably, I will just put it in the same line for the next version. Thanks for bringing this up.
Regards,
Sai
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prev parent reply other threads:[~2020-05-29 4:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-28 19:23 [PATCH V3 0/3] iommu: Add support to change default domain of an iommu Sai Praneeth Prakhya
2020-05-28 19:23 ` [PATCH V3 1/3] iommu: Add support to change default domain of an iommu_group Sai Praneeth Prakhya
2020-05-29 2:43 ` Lu Baolu
2020-05-29 8:15 ` Prakhya, Sai Praneeth
2020-05-28 19:23 ` [PATCH V3 2/3] iommu: Take lock before reading iommu_group default domain type Sai Praneeth Prakhya
2020-05-28 19:24 ` [PATCH V3 3/3] iommu: Document usage of "/sys/kernel/iommu_groups/<grp_id>/type" file Sai Praneeth Prakhya
2020-05-29 1:51 ` [PATCH V3 0/3] iommu: Add support to change default domain of an iommu Lu Baolu
2020-05-29 4:46 ` Prakhya, Sai Praneeth [this message]
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