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Message-ID: <1518992132.2542.5.camel@debian.org>
Subject: Re: [PATCH v7 0/5] Add Intel IOMMU debugfs support
From: Yves-Alexis Perez <corsac@debian.org>
To: "Raj, Ashok" <ashok.raj@intel.com>, Joerg Roedel <joro@8bytes.org>
Cc: Sohil Mehta <sohil.mehta@intel.com>,
        Alex Williamson <alex.williamson@redhat.com>,
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        iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
        Jacob Pan <jacob.jun.pan@linux.intel.com>,
        Gayatri Kammela <gayatri.kammela@intel.com>,
        Ravi V Shankar <ravi.v.shankar@intel.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Lu Baolu <baolu.lu@linux.intel.com>, Fenghua Yu <fenghua.yu@intel.com>
Date: Sun, 18 Feb 2018 23:15:32 +0100
In-Reply-To: <20180213214002.GA27066@otc-nc-03>
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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 thi=
ngs
> like walking 2nd level page-tables, or get some SVM specific data from th=
e=20
> driver in the future.=20

Hi,

I'm not sure how much you know about chipsec [1], but with a oneliner [2] y=
ou
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 gid=
n't
dig to check how it does it).

It might still be useful to have everything from debugfs because it'll alwa=
ys
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
--=20
Yves-Alexis
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