Re: [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging()

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To: Jacob Pan <jacob.pan@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 0/5] Convert virtio-iommu to domain_alloc_paging()
From: Jason Gunthorpe <jgg@xxxxxxxxxx>
Date: Wed, 12 Feb 2025 08:50:07 -0400
Cc: iommu@xxxxxxxxxxxxxxx, Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, virtualization@xxxxxxxxxxxxxxx, Will Deacon <will@xxxxxxxxxx>, Eric Auger <eric.auger@xxxxxxxxxx>, patches@xxxxxxxxxxxxxxx
In-reply-to: <20250211164151.723cfce0@DESKTOP-0403QTC.>
References: <0-v1-91eed9c8014a+53a37-iommu_virtio_domains_jgg@nvidia.com> <20250211164151.723cfce0@DESKTOP-0403QTC.>

On Tue, Feb 11, 2025 at 04:41:51PM -0800, Jacob Pan wrote:

> I see the same on arm64 with v9.0, assigned an ixgbe nic via VFIO.

Huh, I figured it worked on ARM..

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..

Jason

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