linux-kernel - Re: [PATCH v6 06/25] iommufd/access: Allow access->ops to be NULL for internal use

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Message-ID: <20250616133305.GB1174925@nvidia.com>
Date: Mon, 16 Jun 2025 10:33:05 -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 06/25] iommufd/access: Allow access->ops to be NULL
 for internal use

On Sat, Jun 14, 2025 at 12:14:31AM -0700, Nicolin Chen wrote:
> @@ -1321,7 +1328,7 @@ int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova,
>  
>  	/* Driver's ops don't support pin_pages */
>  	if (IS_ENABLED(CONFIG_IOMMUFD_TEST) &&
> -	    WARN_ON(access->iova_alignment != PAGE_SIZE || !access->ops->unmap))
> +	    WARN_ON(access->iova_alignment != PAGE_SIZE))
>  		return -EINVAL;

I don't want to loose this check, continuing blocking mdevs is still
important. Only the internal access should be able to use this
mechanism.

Otherwise:

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

Jason