linux-kernel - Re: [PATCH 2/2] iommufd/device: Drop enforce_cache_coherency in iommufd_hw_pagetable

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Date:   Sat, 21 Oct 2023 09:26:43 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Nicolin Chen <nicolinc@...dia.com>, jgg@...dia.com,
        kevin.tian@...el.com
Cc:     baolu.lu@...ux.intel.com, joro@...tes.org, will@...nel.org,
        robin.murphy@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, yi.l.liu@...el.com
Subject: Re: [PATCH 2/2] iommufd/device: Drop enforce_cache_coherency in
 iommufd_hw_pagetable_attach

On 2023/10/21 8:37, Nicolin Chen wrote:
> According to the conversion in the following link:
> https://lore.kernel.org/linux-iommu/20231020135501.GG3952@nvidia.com/
> 
> The enforce_cache_coherency should be set/enforced in the hwpt allocation
> routine. The iommu driver in its attach_dev() op should decide whether to
> reject or not a device that doesn't match with the configuration of cache
> coherency. Drop the enforce_cache_coherency piece in attach(), so it will
> be called only in the allocation routine. Then, drop it in the header and
> mark it as a static function.
> 
> Cc: stable@...r.kernel.org
> Fixes: 17bad52708b4 ("iommufd: Add enforced_cache_coherency to iommufd_hw_pagetable_alloc()")
> Suggested-by: Tian, Kevin <kevin.tian@...el.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>   drivers/iommu/iommufd/device.c          | 7 -------
>   drivers/iommu/iommufd/hw_pagetable.c    | 2 +-
>   drivers/iommu/iommufd/iommufd_private.h | 1 -
>   3 files changed, 1 insertion(+), 9 deletions(-)

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

Best regards,
baolu