All of lore.kernel.org
 help / color / mirror / Atom feed
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

  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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.