linux-kernel - Re: [PATCH v6 08/25] iommufd/viommu: Add driver-defined vDEVICE support

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Message-ID: <ee1b9096-4687-49ad-815d-efe3dda5d31a@linux.intel.com>
Date: Mon, 16 Jun 2025 14:26:04 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Nicolin Chen <nicolinc@...dia.com>, jgg@...dia.com, kevin.tian@...el.com,
 corbet@....net, will@...nel.org
Cc: 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
Subject: Re: [PATCH v6 08/25] iommufd/viommu: Add driver-defined vDEVICE
 support

On 6/14/25 15:14, Nicolin Chen wrote:
> NVIDIA VCMDQ driver will have a driver-defined vDEVICE structure and do
> some HW configurations with that.
> 
> To allow IOMMU drivers to define their own vDEVICE structures, move the
> struct iommufd_vdevice to the public header and provide a pair of viommu
> ops, similar to get_viommu_size and viommu_init.
> 
> Doing this, however, creates a new window between the vDEVICE allocation
> and its driver-level initialization, during which an abort could happen
> but it can't invoke a driver destroy function from the struct viommu_ops
> since the driver structure isn't initialized yet. vIOMMU object doesn't
> have this problem, since its destroy op is set via the viommu_ops by the
> driver viommu_init function. Thus, vDEVICE should do something similar:
> add a destroy function pointer inside the struct iommufd_vdevice instead
> of the struct iommufd_viommu_ops.
> 
> Note that there is unlikely a use case for a type dependent vDEVICE, so
> a static vdevice_size is probably enough for the near term instead of a
> get_vdevice_size function op.
> 
> Reviewed-by: Jason Gunthorpe<jgg@...dia.com>
> Reviewed-by: Kevin Tian<kevin.tian@...el.com>
> Signed-off-by: Nicolin Chen<nicolinc@...dia.com>

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>