From: Jason Gunthorpe <jgg@nvidia.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: Jacob Pan <jacob.pan@linux.microsoft.com>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Robin Murphy <robin.murphy@arm.com>,
virtualization@lists.linux.dev, Will Deacon <will@kernel.org>,
Eric Auger <eric.auger@redhat.com>,
patches@lists.linux.dev
Subject: Re: [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging()
Date: Mon, 24 Feb 2025 15:39:04 -0400 [thread overview]
Message-ID: <20250224193904.GB524338@nvidia.com> (raw)
In-Reply-To: <20250221114206.GB719702@myrica>
On Fri, Feb 21, 2025 at 11:42:06AM +0000, Jean-Philippe Brucker wrote:
> > There is no requirement that an iommu driver implement identity, this
> > is all an optimization. If it doesn't work in alot of cases can we
> > just remove it? It would simplfy a lot..
>
> No objection. Identity domains are useful if the use-case of virtio-iommu
> is assigning devices to guest userspace, in which case you'd want to
> bypass the IOMMU for the devices that are still owned by the kernel. But
> VMMs have at least two alternatives to identity-mapping (BYPASS feature
> and tailored topology).
Since Robin pointed out a few other drivers that would like to use the
domain_op lets leave it as is.
Thanks,
Jason
next prev parent reply other threads:[~2025-02-24 19:39 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
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 [this message]
[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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20250224193904.GB524338@nvidia.com \
--to=jgg@nvidia.com \
--cc=eric.auger@redhat.com \
--cc=iommu@lists.linux.dev \
--cc=jacob.pan@linux.microsoft.com \
--cc=jean-philippe@linaro.org \
--cc=joro@8bytes.org \
--cc=patches@lists.linux.dev \
--cc=robin.murphy@arm.com \
--cc=virtualization@lists.linux.dev \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).