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

[Matthew Rosato]

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@xxxxxxxxxxxxx>
>> Reviewed-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
>> Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
>> ---
>>  drivers/iommu/s390-iommu.c | 95 +++++++++++++++++++++++++++++---------
>>  1 file changed, 72 insertions(+), 23 deletions(-)
> 
> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> 
> This may want to be changed to use
> 
> https://lore.kernel.org/linux-iommu/2-v1-91eed9c8014a+53a37-iommu_virtio_domains_jgg@xxxxxxxxxx/
> 
> Later on
> 

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