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

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Date:   Thu, 9 Feb 2023 09:43:30 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     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>,
        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>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v2] iommu/vt-d: Avoid superfluous IOTLB tracking in lazy
 mode

Hi Kevin,

On Thu, 9 Feb 2023 02:09:47 +0000, "Tian, Kevin" <kevin.tian@...el.com>
wrote:

> > 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.
> 
sounds good.
> > +	 */
> > +	if (!iommu_iotlb_gather_queued(gather))
> > +		iommu_iotlb_gather_add_page(domain, gather, iova,
> > size); 
> 
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> 


Thanks,

Jacob