linux-kernel - RE: [PATCH v2] iommu/vt-d: Avoid superfluous IOTLB tracking in lazy mode

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Date:   Thu, 9 Feb 2023 02:09:47 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>
CC:     David Woodhouse <dwmw2@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Ghorai, Sukumar" <sukumar.ghorai@...el.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Robin Murphy <robin.murphy@....com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>
Subject: RE: [PATCH v2] iommu/vt-d: Avoid superfluous IOTLB tracking in lazy
 mode

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Sent: Thursday, February 9, 2023 2:19 AM
> 
> -	iommu_iotlb_gather_add_page(domain, gather, iova, size);
> +	/*
> +	 * We do not use page-selective IOTLB invalidation in flush queue,
> +	 * There is no need to track page and sync iotlb. Domain-selective or

"in flush queue, so there is ..."

> +	 * PASID-selective validation are used in the flush queue.

the last sentence can be removed. same meaning as the first one.

> +	 */
> +	if (!iommu_iotlb_gather_queued(gather))
> +		iommu_iotlb_gather_add_page(domain, gather, iova, size);
> 

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