linux-kernel - RE: [RFC PATCH 2/6] iommu/amd: Add support for hw

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Date: Fri, 15 Dec 2023 07:32:08 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, "joro@...tes.org"
	<joro@...tes.org>, "jgg@...dia.com" <jgg@...dia.com>
CC: "Liu, Yi L" <yi.l.liu@...el.com>, "nicolinc@...dia.com"
	<nicolinc@...dia.com>, "eric.auger@...hat.com" <eric.auger@...hat.com>,
	"vasant.hegde@....com" <vasant.hegde@....com>, "jon.grimm@....com"
	<jon.grimm@....com>, "santosh.shukla@....com" <santosh.shukla@....com>,
	"Dhaval.Giani@....com" <Dhaval.Giani@....com>, "pandoh@...gle.com"
	<pandoh@...gle.com>, "loganodell@...gle.com" <loganodell@...gle.com>
Subject: RE: [RFC PATCH 2/6] iommu/amd: Add support for hw_info for iommu
 capability query

> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Sent: Wednesday, December 13, 2023 12:02 AM
> 
> +void amd_iommu_build_efr(u64 *efr, u64 *efr2)
> +{
> +	if (efr) {
> +		*efr = (FEATURE_GT | FEATURE_GIOSUP | FEATURE_PPR);
> +
> +		/* 5-level v2 page table support */
> +		*efr |= ((FEATURE_GATS_5LEVEL << FEATURE_GATS_SHIFT) &
> +			 FEATURE_GATS_MASK);
> +
> +		/* 3-level GCR3 table support */
> +		*efr |= ((FEATURE_GLX_3LEVEL << FEATURE_GLX_SHIFT) &
> +			 FEATURE_GLX_MASK);
> +
> +		/* 16-bit PASMAX support */
> +		*efr |= ((FEATURE_PASMAX_16 << FEATURE_PASMAX_SHIFT)
> &
> +			 FEATURE_PASMAX_MASK);
> +	}
> +
> +	if (efr2)
> +		*efr2 = 0;
> +}

Don't this need to check the support in hw?