linux-kernel - Re: [PATCH v7 01/10] iommu: Introduce domain attachment handle

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Message-ID: <Zn8hNQDOvAJsQ5Fg@ziepe.ca>
Date: Fri, 28 Jun 2024 17:46:45 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Kevin Tian <kevin.tian@...el.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Nicolin Chen <nicolinc@...dia.com>, Yi Liu <yi.l.liu@...el.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Joel Granados <j.granados@...sung.com>, iommu@...ts.linux.dev,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 01/10] iommu: Introduce domain attachment handle

On Sun, Jun 16, 2024 at 02:11:46PM +0800, Lu Baolu wrote:
> Currently, when attaching a domain to a device or its PASID, domain is
> stored within the iommu group. It could be retrieved for use during the
> window between attachment and detachment.
> 
> With new features introduced, there's a need to store more information
> than just a domain pointer. This information essentially represents the
> association between a domain and a device. For example, the SVA code
> already has a custom struct iommu_sva which represents a bond between
> sva domain and a PASID of a device. Looking forward, the IOMMUFD needs
> a place to store the iommufd_device pointer in the core, so that the
> device object ID could be quickly retrieved in the critical fault handling
> path.
> 
> Introduce domain attachment handle that explicitly represents the
> attachment relationship between a domain and a device or its PASID.
> 
> Co-developed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  include/linux/iommu.h     | 18 +++++++++++++++---
>  drivers/dma/idxd/init.c   |  2 +-
>  drivers/iommu/iommu-sva.c | 13 ++++++++-----
>  drivers/iommu/iommu.c     | 26 ++++++++++++++++----------
>  4 files changed, 40 insertions(+), 19 deletions(-)

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

Jason