linux-kernel - Re: [PATCH v10 05/12] iommu: Add IOMMU SVA domain support

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Date:   Sat, 23 Jul 2022 11:15:12 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Zhu Tony <tony.zhu@...el.com>, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Jean-Philippe Brucker <jean-philippe@...aro.org>
Subject: Re: [PATCH v10 05/12] iommu: Add IOMMU SVA domain support

On Tue, Jul 05, 2022 at 01:07:03PM +0800, Lu Baolu wrote:
> The sva iommu_domain represents a hardware pagetable that the IOMMU
> hardware could use for SVA translation. This adds some infrastructure
> to support SVA domain in the iommu common layer. It includes:
> 
> - Extend the iommu_domain to support a new IOMMU_DOMAIN_SVA domain
>   type. The IOMMU drivers that support allocation of the SVA domain
>   should provide its own sva domain specific iommu_domain_ops.
> - Add a helper to allocate an SVA domain. The iommu_domain_free()
>   is still used to free an SVA domain.
> 
> The report_iommu_fault() should be replaced by the new
> iommu_report_device_fault(). Leave the existing fault handler with the
> existing users and the newly added SVA members excludes it.
> 
> Suggested-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Suggested-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Tested-by: Zhangfei Gao <zhangfei.gao@...aro.org>
> Tested-by: Tony Zhu <tony.zhu@...el.com>
> ---
>  include/linux/iommu.h | 24 ++++++++++++++++++++++--
>  drivers/iommu/iommu.c | 20 ++++++++++++++++++++
>  2 files changed, 42 insertions(+), 2 deletions(-)

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

Jason