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

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Date: Tue, 26 Dec 2023 12:14:40 +0800
From: Yi Liu <yi.l.liu@...el.com>
To: "Tian, Kevin" <kevin.tian@...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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	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>, "Duan,
 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

On 2023/12/22 14:04, Tian, Kevin wrote:
>> 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().

yes, it is. May be as below:

This makes the pasid based cache invalidation and device TLB invalidation
to return QI faults to callers.

Then the subject may be:

iommu/vt-d: Convert stage-1 cache invalidation to return QI fault

> 
>> 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>

-- 
Regards,
Yi Liu