linux-kernel - Re: [PATCH v3 5/8] iommufd: Associate fault object with iommufd_hw

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Date: Fri, 8 Mar 2024 15:05:39 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Kevin Tian <kevin.tian@...el.com>, 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>, Yi Liu <yi.l.liu@...el.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Joel Granados <j.granados@...sung.com>, iommu@...ts.linux.dev,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/8] iommufd: Associate fault object with
 iommufd_hw_pgtable

On Mon, Jan 22, 2024 at 03:39:00PM +0800, Lu Baolu wrote:

> @@ -411,6 +414,8 @@ enum iommu_hwpt_data_type {
>   * @__reserved: Must be 0
>   * @data_type: One of enum iommu_hwpt_data_type
>   * @data_len: Length of the type specific data
> + * @fault_id: The ID of IOMMUFD_FAULT object. Valid only if flags field of
> + *            IOMMU_HWPT_FAULT_ID_VALID is set.
>   * @data_uptr: User pointer to the type specific data
>   *
>   * Explicitly allocate a hardware page table object. This is the same object
> @@ -441,6 +446,7 @@ struct iommu_hwpt_alloc {
>  	__u32 __reserved;
>  	__u32 data_type;
>  	__u32 data_len;
> +	__u32 fault_id;
>  	__aligned_u64 data_uptr;
>  };

?? We can't add fault_id in the middle of the struct??

> +	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;
> +		hwpt->fault_capable = true;

I wonder if there should be an iommu API to make a domain fault
capable?

Jason