linux-kernel - Re: [PATCH v7 0/5] Add Intel IOMMU debugfs support

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Date:   Sun, 18 Feb 2018 23:15:32 +0100
From:   Yves-Alexis Perez <corsac@...ian.org>
To:     "Raj, Ashok" <ashok.raj@...el.com>, Joerg Roedel <joro@...tes.org>
Cc:     Sohil Mehta <sohil.mehta@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH v7 0/5] Add Intel IOMMU debugfs support

On Tue, 2018-02-13 at 13:40 -0800, Raj, Ashok wrote:
> This version has only hw dumps for now, but we plan to add some other things
> like walking 2nd level page-tables, or get some SVM specific data from the 
> driver in the future. 

Hi,

I'm not sure how much you know about chipsec [1], but with a oneliner [2] you
can have it print a lot of data from Vt-d configuration, including page
tables. As far as I remember, it doesn't need access to /dev/mem (but I gidn't
dig to check how it does it).

It might still be useful to have everything from debugfs because it'll always
be consistent with the current running kernel, but at least it might help
users reporting bugs.

[1] https://github.com/chipsec/chipsec
[2] http://paste.debian.net/1010105
-- 
Yves-Alexis
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