linux-kernel - RE: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain

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Date: Fri, 22 Dec 2023 06:47:20 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: "Yang, Weijiang" <weijiang.yang@...el.com>, "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"
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	"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>,
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 Zhenzhong" <zhenzhong.duan@...el.com>, "joao.m.martins@...cle.com"
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	<yan.y.zhao@...el.com>, "j.granados@...sung.com" <j.granados@...sung.com>
Subject: RE: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain

> From: Yang, Weijiang <weijiang.yang@...el.com>
> Sent: Friday, December 22, 2023 11:56 AM
> > +
> > +	xa_for_each(&domain->iommu_array, i, info) {
> > +		nested_flush_pasid_iotlb(info->iommu, domain, addr,
> npages, 0);
> > +
> > +		if (domain->has_iotlb_device)
> > +			continue;
> 
> Shouldn't this be if (!domain->has_iotlb_device)?

yes that is wrong.

actually it's weird to put domain check in a loop of domain->iommu_array.

that check along with devtlb flush should be done out of that loop.