linux-kernel - RE: [PATCH v5 3/9] iommu: Add attachment handle to struct iopf

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Date: Wed, 15 May 2024 07:31:12 +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 3/9] iommu: Add attachment handle to struct iopf_group

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, April 30, 2024 10:57 PM
> 
> Previously, the domain that a page fault targets is stored in an
> iopf_group, which represents a minimal set of page faults. With the
> introduction of attachment handle, replace the domain with the handle

It's better to use 'attach handle' as the code does.

> +	handle = iommu_attach_handle_get(dev->iommu_group, pasid, 0);
> +	if (IS_ERR(handle))
> +		return PTR_ERR(handle);
> 
> -	if (!domain || !domain->iopf_handler) {
> -		dev_warn_ratelimited(dev,
> -			"iopf (pasid %d) without domain attached or handler
> installed\n",
> -			 fault->prm.pasid);
> +	group->attach_handle = handle;
> +	group->domain = handle->domain;

this change also removes the warning message. Is it desired?