linux-kernel - RE: [PATCH rc 3/8] iommu/vt-d: Add missing iotlb flush for parent domain

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Date: Thu, 8 Feb 2024 08:38:37 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: "Liu, Yi L" <yi.l.liu@...el.com>, "joro@...tes.org" <joro@...tes.org>,
	"jgg@...dia.com" <jgg@...dia.com>, "baolu.lu@...ux.intel.com"
	<baolu.lu@...ux.intel.com>
CC: "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"robin.murphy@....com" <robin.murphy@....com>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "nicolinc@...dia.com" <nicolinc@...dia.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "chao.p.peng@...ux.intel.com"
	<chao.p.peng@...ux.intel.com>, "yi.y.sun@...ux.intel.com"
	<yi.y.sun@...ux.intel.com>, "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>
Subject: RE: [PATCH rc 3/8] iommu/vt-d: Add missing iotlb flush for parent
 domain

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Thursday, February 8, 2024 4:23 PM
> 
> +/*
> + * Flush the relevant caches in nested translation if the domain
> + * also serves as a parent
> + */
> +static void parent_domain_flush(struct dmar_domain *domain,
> +				unsigned long pfn,
> +				unsigned long pages, int ih)
> +{
> +	struct dmar_domain *s1_domain;
> +
> +	spin_lock(&domain->s1_lock);
> +	list_for_each_entry(s1_domain, &domain->s1_domains, s2_link) {
> +		struct iommu_domain_info *info;
> +		unsigned long i;
> +
> +		xa_for_each(&s1_domain->iommu_array, i, info)
> +			__iommu_flush_iotlb_psi(info->iommu, info->did,
> +						pfn, pages, ih);
> +	}

As Jason suggested before this xarray lacks of proper locking.

but given it's rc fix I'm fine with it. @Baolu we do need fix it soon so
this problem won't further expand like here.

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