linux-kernel - Re: [PATCH v3 07/16] iommufd: Allow hwpt_id to carry viommu_id for IOMMU_HWPT

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Message-ID: <20241017190849.GV3559746@nvidia.com>
Date: Thu, 17 Oct 2024 16:08:49 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, eric.auger@...hat.com,
	jean-philippe@...aro.org, mdf@...nel.org, mshavit@...gle.com,
	shameerali.kolothum.thodi@...wei.com, smostafa@...gle.com,
	yi.l.liu@...el.com, aik@....com, patches@...ts.linux.dev
Subject: Re: [PATCH v3 07/16] iommufd: Allow hwpt_id to carry viommu_id for
 IOMMU_HWPT_INVALIDATE

On Wed, Oct 09, 2024 at 09:38:19AM -0700, Nicolin Chen wrote:
> With a vIOMMU object, use space can flush any IOMMU related cache that can
> be directed using the vIOMMU object. It is similar to IOMMU_HWPT_INVALIDATE
> uAPI, but can cover a wider range than IOTLB, e.g. device/desciprtor cache.
> 
> Allow hwpt_id of the iommu_hwpt_invalidate structure to carry a viommu_id,
> and reuse the IOMMU_HWPT_INVALIDATE uAPI for vIOMMU invalidations. Drivers
> can define different structures for vIOMMU invalidations v.s. HWPT ones.
> 
> Update the uAPI, kdoc, and selftest case accordingly.
> 
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  include/uapi/linux/iommufd.h            |  9 ++++---
>  drivers/iommu/iommufd/hw_pagetable.c    | 32 +++++++++++++++++++------
>  tools/testing/selftests/iommu/iommufd.c |  4 ++--
>  3 files changed, 33 insertions(+), 12 deletions(-)

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

Jason