linux-kernel - Re: [PATCH v6 19/25] iommu/arm-smmu-v3-iommufd: Add vsmmu_size/type and vsmmu

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Message-ID: <20250616141911.GI1174925@nvidia.com>
Date: Mon, 16 Jun 2025 11:19:11 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, corbet@....net, will@...nel.org,
	bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
	peterz@...radead.org, yi.l.liu@...el.com, mshavit@...gle.com,
	praan@...gle.com, zhangzekun11@...wei.com, iommu@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
	mochs@...dia.com, alok.a.tiwari@...cle.com, vasant.hegde@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com
Subject: Re: [PATCH v6 19/25] iommu/arm-smmu-v3-iommufd: Add vsmmu_size/type
 and vsmmu_init impl ops

On Sat, Jun 14, 2025 at 12:14:44AM -0700, Nicolin Chen wrote:
> An impl driver might want to allocate its own type of vIOMMU object or the
> standard IOMMU_VIOMMU_TYPE_ARM_SMMUV3 by setting up its own SW/HW bits, as
> the tegra241-cmdqv driver will add IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV.
> 
> Add vsmmu_size/type and vsmmu_init to struct arm_smmu_impl_ops. Prioritize
> them in arm_smmu_get_viommu_size() and arm_vsmmu_init().
> 
> Reviewed-by: Pranjal Shrivastava <praan@...gle.com>
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h         | 5 +++++
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 8 ++++++++
>  2 files changed, 13 insertions(+)

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

Jason