linux-kernel - RE: [PATCH v5 04/13] iommufd/hw_pagetable: Enforce invalidation op on vIOMMU-based hwpt

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Message-ID: <BN9PR11MB5276EC0C0CBA3AAF700B57238C4B2@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Tue, 29 Oct 2024 08:22:43 +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"
	<suravee.suthikulpanit@....com>, "robin.murphy@....com"
	<robin.murphy@....com>, "dwmw2@...radead.org" <dwmw2@...radead.org>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>, "shuah@...nel.org"
	<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"
	<linux-kselftest@...r.kernel.org>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "jean-philippe@...aro.org"
	<jean-philippe@...aro.org>, "mdf@...nel.org" <mdf@...nel.org>,
	"mshavit@...gle.com" <mshavit@...gle.com>,
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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 v5 04/13] iommufd/hw_pagetable: Enforce invalidation op on
 vIOMMU-based hwpt_nested

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, October 26, 2024 7:51 AM
> 
> @@ -302,7 +302,9 @@ iommufd_viommu_alloc_hwpt_nested(struct
> iommufd_viommu *viommu, u32 flags,
>  	}
>  	hwpt->domain->owner = viommu->iommu_dev->ops;
> 
> -	if (WARN_ON_ONCE(hwpt->domain->type !=
> IOMMU_DOMAIN_NESTED)) {
> +	if (WARN_ON_ONCE(hwpt->domain->type !=
> IOMMU_DOMAIN_NESTED ||
> +			 (!viommu->ops->cache_invalidate &&
> +			  !hwpt->domain->ops->cache_invalidate_user))) {
>  		rc = -EINVAL;
>  		goto out_abort;
>  	}

According to patch5, cache invalidate in viommu only uses
viommu->ops->cache_invalidate. Is here intended to allow
nested hwpt created via viommu to still support the old
method?