linux-kernel - RE: [PATCH v4 6/7] iommu/vt-d: Add support for static identity domain

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Message-ID: <BN9PR11MB5276BCEC41AA08D80CE985F18CBA2@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Fri, 9 Aug 2024 08:29:35 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>, "Will
 Deacon" <will@...nel.org>, Robin Murphy <robin.murphy@....com>, "Jason
 Gunthorpe" <jgg@...pe.ca>
CC: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Jason
 Gunthorpe" <jgg@...dia.com>
Subject: RE: [PATCH v4 6/7] iommu/vt-d: Add support for static identity domain

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Friday, August 9, 2024 1:55 PM
> 
> +static int context_setup_pass_through(struct device *dev, u8 bus, u8 devfn)
> +{
> +	struct device_domain_info *info = dev_iommu_priv_get(dev);
> +	struct intel_iommu *iommu = info->iommu;
> +	struct context_entry *context;
> +
> +	spin_lock(&iommu->lock);
> +	context = iommu_context_addr(iommu, bus, devfn, 1);
> +	if (!context) {
> +		spin_unlock(&iommu->lock);
> +		return -ENOMEM;
> +	}
> +
> +	if (context_present(context) && !context_copied(iommu, bus, devfn))
> {
> +		spin_unlock(&iommu->lock);
> +		return 0;
> +	}

Is it a valid case to setup passthrough on a present entry?