linux-kernel - RE: [PATCH v4 04/11] iommufd/viommu: Add IOMMU_VIOMMU

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Message-ID: <BN9PR11MB5276528AB82E7C8AF53FBA1D8C4F2@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Fri, 25 Oct 2024 09:05:58 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"will@...nel.org" <will@...nel.org>
CC: "joro@...tes.org" <joro@...tes.org>, "suravee.suthikulpanit@....com"
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	<shuah@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kselftest@...r.kernel.org"
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	<shameerali.kolothum.thodi@...wei.com>, "smostafa@...gle.com"
	<smostafa@...gle.com>, "Liu, Yi L" <yi.l.liu@...el.com>, "aik@....com"
	<aik@....com>, "zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>,
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH v4 04/11] iommufd/viommu: Add IOMMU_VIOMMU_ALLOC ioctl

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Tuesday, October 22, 2024 8:19 AM
> +
> +	viommu->type = cmd->type;
> +	viommu->ictx = ucmd->ictx;
> +	viommu->hwpt = hwpt_paging;
> +	/* Assume physical IOMMUs are unpluggable (the most likely case)
> */
> +	viommu->iommu_dev = __iommu_get_iommu_dev(idev->dev);
> +

so what would happen if this assumption breaks?