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

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Message-ID: <58c0a779-d122-446e-8824-33b48b45514f@linux.ibm.com>
Date: Thu, 13 Feb 2025 11:02:59 -0500
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: Jason Gunthorpe <jgg@...dia.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 2/13/25 10:10 AM, Jason Gunthorpe wrote:
> 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
> 

Thanks for reviewing again.  And ACK, I will look at this for follow-on