linux-kernel - RE: [PATCH v7 8/9] iommu/vt-d: Convert pasid based cache invalidation to return QI fault

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Message-ID: <BN9PR11MB527600A6E4F860C3273B3B098C94A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Fri, 22 Dec 2023 06:04:01 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: "Liu, Yi L" <yi.l.liu@...el.com>, "joro@...tes.org" <joro@...tes.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>, "jgg@...dia.com"
	<jgg@...dia.com>, "robin.murphy@....com" <robin.murphy@....com>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
CC: "cohuck@...hat.com" <cohuck@...hat.com>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "nicolinc@...dia.com" <nicolinc@...dia.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "mjrosato@...ux.ibm.com"
	<mjrosato@...ux.ibm.com>, "chao.p.peng@...ux.intel.com"
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	<shameerali.kolothum.thodi@...wei.com>, "lulu@...hat.com" <lulu@...hat.com>,
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	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
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 Zhenzhong" <zhenzhong.duan@...el.com>, "joao.m.martins@...cle.com"
	<joao.m.martins@...cle.com>, "Zeng, Xin" <xin.zeng@...el.com>, "Zhao, Yan Y"
	<yan.y.zhao@...el.com>, "j.granados@...sung.com" <j.granados@...sung.com>
Subject: RE: [PATCH v7 8/9] iommu/vt-d: Convert pasid based cache invalidation
 to return QI fault

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Thursday, December 21, 2023 11:40 PM
> 
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> This makes the pasid based cache invalidation to return QI faults to callers.

it's not just for pasid cache invalidation, e.g. there is also change on
qi_flush_dev_iotlb().

> This is needed when usersapce wants to invalidate cache after modifying the
> stage-1 page table used in nested translation.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Yi Liu <yi.l.liu@...el.com>

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