linux-kernel - Re: [PATCH 01/12] iommu/vt-d: Use iommu_get_domain_for

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Message-ID: <dafc1451-d3f9-150a-2d95-12bc4616f3bc@linux.intel.com>
Date:   Wed, 1 Jun 2022 14:39:14 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Robin Murphy <robin.murphy@....com>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Will Deacon <will@...nel.org>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/12] iommu/vt-d: Use iommu_get_domain_for_dev() in
 debugfs

On 2022/6/1 02:51, Jason Gunthorpe wrote:
>> Oh, I've spent the last couple of weeks hacking up horrible things
>> manipulating entries in init_mm, and never realised that that was actually
>> the special case. Oh well, live and learn.
> The init_mm is sort of different, it doesn't have zap in quite the
> same way, for example. I was talking about the typical process mm.
> 
> Anyhow, the right solution is to use RCU as I described before, Baolu
> do you want to try?

Yes, of course.

Your discussion with Robin gave me a lot of inspiration. Very
appreciated! I want to use a separate patch to solve this debugfs
problem, because it has exceeded the original intention of this series.

Best regards,
baolu