linux-kernel - RE: [PATCH v5 7/9] iommufd: Associate fault object with iommufd_hw

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Date: Wed, 15 May 2024 08:50:56 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>, Jason Gunthorpe <jgg@...pe.ca>,
	"Joerg Roedel" <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy
	<robin.murphy@....com>, Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Nicolin Chen <nicolinc@...dia.com>, "Liu, Yi L" <yi.l.liu@...el.com>, "Jacob
 Pan" <jacob.jun.pan@...ux.intel.com>, Joel Granados <j.granados@...sung.com>
CC: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"virtualization@...ts.linux-foundation.org"
	<virtualization@...ts.linux-foundation.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 7/9] iommufd: Associate fault object with
 iommufd_hw_pgtable

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, April 30, 2024 10:57 PM
>
> @@ -227,7 +233,7 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx
> *ictx,
>  	refcount_inc(&parent->common.obj.users);
>  	hwpt_nested->parent = parent;
> 
> -	hwpt->domain = ops->domain_alloc_user(idev->dev, flags,
> +	hwpt->domain = ops->domain_alloc_user(idev->dev, 0,
>  					      parent->common.domain,
> user_data);

it reads slightly better to clear the fault bit and still pass in flags.

> @@ -308,6 +314,19 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd
> *ucmd)
>  		goto out_put_pt;
>  	}
> 
> +	if (cmd->flags & IOMMU_HWPT_FAULT_ID_VALID) {
> +		struct iommufd_fault *fault;
> +
> +		fault = iommufd_get_fault(ucmd, cmd->fault_id);
> +		if (IS_ERR(fault)) {
> +			rc = PTR_ERR(fault);
> +			goto out_hwpt;
> +		}
> +		hwpt->fault = fault;
> +		hwpt->domain->iopf_handler = iommufd_fault_iopf_handler;
> +		hwpt->domain->fault_data = hwpt;
> +	}

this is nesting specific. why not moving it to the nested_alloc()?