linux-kernel - Re: [PATCH v5 4/4] iommu/s390: implement iommu passthrough via identity domain

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Message-ID: <20250213151037.GD3754072@nvidia.com>
Date: Thu, 13 Feb 2025 11:10:37 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Matthew Rosato <mjrosato@...ux.ibm.com>
Cc: joro@...tes.org, will@...nel.org, robin.murphy@....com,
	gerald.schaefer@...ux.ibm.com, schnelle@...ux.ibm.com,
	hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
	svens@...ux.ibm.com, borntraeger@...ux.ibm.com,
	farman@...ux.ibm.com, clegoate@...hat.com, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v5 4/4] iommu/s390: implement iommu passthrough via
 identity domain

On Wed, Feb 12, 2025 at 04:34:18PM -0500, Matthew Rosato wrote:
> Enabled via the kernel command-line 'iommu.passthrough=1' option.
> 
> Introduce the concept of identity domains to s390-iommu, which relies on
> the bus_dma_region to offset identity mappings to the start of the DMA
> aperture advertized by CLP.
> 
> Tested-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> ---
>  drivers/iommu/s390-iommu.c | 95 +++++++++++++++++++++++++++++---------
>  1 file changed, 72 insertions(+), 23 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

This may want to be changed to use

https://lore.kernel.org/linux-iommu/2-v1-91eed9c8014a+53a37-iommu_virtio_domains_jgg@nvidia.com/

Later on

Jason