linux-kernel - RE: [PATCH v3 3/5] iommu/vt-d: Setup scalable mode context entry in probe path

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Message-ID: <BN9PR11MB527698ADE41D00838D94C0A08C222@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Tue, 5 Mar 2024 01:50:11 +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>, "Badger, Eric" <ebadger@...estorage.com>
CC: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 3/5] iommu/vt-d: Setup scalable mode context entry in
 probe path

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, March 5, 2024 9:33 AM
> 
> In contrast to legacy mode, the DMA translation table is configured in
> the PASID table entry instead of the context entry for scalable mode.
> For this reason, it is more appropriate to set up the scalable mode
> context entry in the device_probe callback and direct it to the
> appropriate PASID table.
> 
> The iommu domain attach/detach operations only affect the PASID table
> entry. Therefore, there is no need to modify the context entry when
> configuring the translation type and page table.
> 
> The only exception is the kdump case, where context entry setup is
> postponed until the device driver invokes the first DMA interface.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>