From: Jason Gunthorpe <jgg@nvidia.com>
To: Robin Murphy <robin.murphy@arm.com>
Cc: iommu@lists.linux.dev,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Joerg Roedel <joro@8bytes.org>,
virtualization@lists.linux.dev, Will Deacon <will@kernel.org>,
Eric Auger <eric.auger@redhat.com>,
patches@lists.linux.dev, Alyssa Rosenzweig <alyssa@rosenzweig.io>,
Sven Peter <sven@svenpeter.dev>, Janne Grunau <j@jannau.net>
Subject: Re: [PATCH 2/5] iommu: Add domain_alloc_identity()
Date: Wed, 12 Feb 2025 10:03:16 -0400 [thread overview]
Message-ID: <20250212140316.GA3844591@nvidia.com> (raw)
In-Reply-To: <f0164c18-9ded-4c41-a8c5-c225a978973d@arm.com>
On Wed, Feb 12, 2025 at 01:56:55PM +0000, Robin Murphy wrote:
> On 2025-02-07 2:46 pm, Jason Gunthorpe wrote:
> > virtio-iommu has a mode where the IDENTITY domain is actually a paging
> > domain with an identity mapping covering some of the system address
> > space manually created.
> >
> > To support this add a new domain_alloc_identity() op that accepts
> > the struct device so that virtio can allocate and fully finalize a
> > paging domain to return.
>
> Oh, I'd already managed to forget this idea - this could be convenient for
> DART to implement per-instance identity domain support as well.
If we are going to broaden this someday then I suggest the core code should
implement it entirely buy asking the driver for a paging domain and
then mapping all of system memory into it. There is nothing special
here that needs to be in driver code.
Jason
next prev parent reply other threads:[~2025-02-12 14:03 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-07 14:46 [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging() Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 1/5] iommu/virtio: Break out bypass identity support into a global static Jason Gunthorpe
2025-02-12 0:43 ` Jacob Pan
2025-02-18 18:21 ` Jason Gunthorpe
2025-02-21 11:35 ` Jean-Philippe Brucker
2025-02-24 19:37 ` Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 2/5] iommu: Add domain_alloc_identity() Jason Gunthorpe
2025-02-12 13:56 ` Robin Murphy
2025-02-12 14:03 ` Jason Gunthorpe [this message]
2025-02-12 14:16 ` Robin Murphy
2025-02-12 14:45 ` Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 3/5] iommu/virtio: Move to domain_alloc_paging() Jason Gunthorpe
2025-02-12 19:22 ` Jacob Pan
2025-02-12 23:30 ` Jason Gunthorpe
2025-02-13 5:47 ` Jacob Pan
2025-02-18 20:01 ` Jason Gunthorpe
[not found] ` <67ad876d.170a0220.3c21dc.85ceSMTPIN_ADDED_BROKEN@mx.google.com>
2025-02-13 9:46 ` Jean-Philippe Brucker
2025-02-13 17:03 ` Yu Zhang
2025-02-13 18:09 ` Jean-Philippe Brucker
2025-02-19 9:39 ` Yu Zhang
2025-02-19 10:35 ` Jean-Philippe Brucker
2025-02-19 11:11 ` Yu Zhang
2025-02-19 11:57 ` Jean-Philippe Brucker
2025-02-19 13:10 ` Yi Liu
2025-02-20 2:58 ` Baolu Lu
2025-02-20 3:44 ` Yu Zhang
2025-02-07 14:46 ` [PATCH 4/5] iommu: Do not call domain_alloc() in iommu_sva_domain_alloc() Jason Gunthorpe
2025-02-07 14:46 ` [PATCH 5/5] iommu: Hide ops.domain_alloc behind CONFIG_FSL_PAMU Jason Gunthorpe
2025-02-12 0:41 ` [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging() Jacob Pan
2025-02-12 12:50 ` Jason Gunthorpe
2025-02-12 18:50 ` Jacob Pan
2025-02-12 20:10 ` Robin Murphy
2025-02-21 11:42 ` Jean-Philippe Brucker
2025-02-24 19:39 ` Jason Gunthorpe
[not found] ` <67abee53.170a0220.154671.ae28SMTPIN_ADDED_BROKEN@mx.google.com>
2025-02-12 11:58 ` Jean-Philippe Brucker
2025-02-12 17:05 ` Jacob Pan
[not found] ` <67acd4e2.630a0220.365aab.e098SMTPIN_ADDED_BROKEN@mx.google.com>
2025-02-12 19:16 ` Jean-Philippe Brucker
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