From: Jason Gunthorpe <jgg@nvidia.com>
To: Matthew Rosato <mjrosato@linux.ibm.com>
Cc: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com,
gerald.schaefer@linux.ibm.com, schnelle@linux.ibm.com,
hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com,
svens@linux.ibm.com, borntraeger@linux.ibm.com,
farman@linux.ibm.com, clegoate@redhat.com, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org
Subject: Re: [PATCH v5 4/4] iommu/s390: implement iommu passthrough via identity domain
Date: Thu, 13 Feb 2025 11:10:37 -0400 [thread overview]
Message-ID: <20250213151037.GD3754072@nvidia.com> (raw)
In-Reply-To: <20250212213418.182902-5-mjrosato@linux.ibm.com>
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@linux.ibm.com>
> Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
> drivers/iommu/s390-iommu.c | 95 +++++++++++++++++++++++++++++---------
> 1 file changed, 72 insertions(+), 23 deletions(-)
Reviewed-by: Jason Gunthorpe <jgg@nvidia.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
next prev parent reply other threads:[~2025-02-13 15:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-12 21:34 [PATCH v5 0/4] iommu/s390: add support for IOMMU passthrough Matthew Rosato
2025-02-12 21:34 ` [PATCH v5 1/4] s390/pci: check for relaxed translation capability Matthew Rosato
2025-02-12 21:34 ` [PATCH v5 2/4] s390/pci: store DMA offset in bus_dma_region Matthew Rosato
2025-02-13 14:02 ` Niklas Schnelle
2025-02-12 21:34 ` [PATCH v5 3/4] iommu/s390: handle IOAT registration based on domain Matthew Rosato
2025-02-12 21:34 ` [PATCH v5 4/4] iommu/s390: implement iommu passthrough via identity domain Matthew Rosato
2025-02-13 15:10 ` Jason Gunthorpe [this message]
2025-02-13 16:02 ` Matthew Rosato
2025-02-21 11:02 ` [PATCH v5 0/4] iommu/s390: add support for IOMMU passthrough Joerg Roedel
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