linux-kernel - Re: [PATCH v6 07/13] iommufd: Allow pt_id to carry viommu_id for IOMMU_HWPT

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Message-ID: <20241031131459.GJ10193@nvidia.com>
Date: Thu, 31 Oct 2024 10:14:59 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, corbet@....net, joro@...tes.org,
	suravee.suthikulpanit@....com, will@...nel.org,
	robin.murphy@....com, dwmw2@...radead.org, shuah@...nel.org,
	iommu@...ts.linux.dev, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	baolu.lu@...ux.intel.com, 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, zhangfei.gao@...aro.org,
	patches@...ts.linux.dev
Subject: Re: [PATCH v6 07/13] iommufd: Allow pt_id to carry viommu_id for
 IOMMU_HWPT_ALLOC

On Wed, Oct 30, 2024 at 02:34:33PM -0700, Nicolin Chen wrote:
> +static struct iommufd_hwpt_nested *
> +iommufd_viommu_alloc_hwpt_nested(struct iommufd_viommu *viommu, u32 flags,
> +				 const struct iommu_user_data *user_data)
> +{
> +	struct iommufd_hwpt_nested *hwpt_nested;
> +	struct iommufd_hw_pagetable *hwpt;
> +	int rc;
> +
> +	if ((flags & ~IOMMU_HWPT_FAULT_ID_VALID) || !user_data->len)
> +		return ERR_PTR(-EOPNOTSUPP);

Now that flags exists we are expecting the driver to validate it, so
this check on flags should be dropped?

Or we go back to hiding FAULT_ID_VALID from the driver (and keep the flags)?

Jason