From: Jacob Pan <jacob.jun.pan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Yves-Alexis Perez <corsac-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
Cc: Ravi V Shankar
<ravi.v.shankar-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"Raj, Ashok" <ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Fenghua Yu <fenghua.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Andy Shevchenko
<andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Gayatri Kammela
<gayatri.kammela-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v7 0/5] Add Intel IOMMU debugfs support
Date: Thu, 22 Feb 2018 09:09:29 -0800 [thread overview]
Message-ID: <20180222090929.12cc8344@jacob-builder> (raw)
In-Reply-To: <1519285717.2388.11.camel-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
On Thu, 22 Feb 2018 08:48:37 +0100
Yves-Alexis Perez <corsac-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org> wrote:
> On Tue, 2018-02-20 at 14:25 -0800, Jacob Pan wrote:
> > I didn't know about chipsec but reading the code seems to rely on an
> > out-of-tree kernel module. I don't think it matches what we need
> > here.
>
> Yes good indeed, I had forgot about that. Maybe the userland part is
> still useful, but there's definitely a need for (protected) access to
> privileged memory (and access to /dev/mem is less practical than
> debugfs, I guess).
>
Another reason we can't use /dev/mem is that the context entries are
not static, they are created for each device when the first map()
comes. So we need to rely on the list in the intel iommu driver to dump
the context.
> Regards,
[Jacob Pan]
prev parent reply other threads:[~2018-02-22 17:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-03 0:49 [PATCH v7 0/5] Add Intel IOMMU debugfs support Sohil Mehta
[not found] ` <1517619001-148586-1-git-send-email-sohil.mehta-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2018-02-03 0:49 ` [PATCH v7 1/5] iommu/vt-d: Relocate struct/function declarations to its header files Sohil Mehta
2018-02-03 0:49 ` [PATCH v7 2/5] iommu/vt-d: Enable debugfs support to show context internals Sohil Mehta
2018-02-03 0:49 ` [PATCH v7 3/5] iommu/vt-d: Add debugfs support to show register contents Sohil Mehta
2018-02-03 0:50 ` [PATCH v7 4/5] iommu/vt-d: Add debugfs support to show Pasid table contents Sohil Mehta
2018-02-03 0:50 ` [PATCH v7 5/5] iommu/vt-d: Add debugfs support for Interrupt remapping Sohil Mehta
2018-02-04 14:13 ` [PATCH v7 0/5] Add Intel IOMMU debugfs support Andy Shevchenko
2018-02-13 14:03 ` Joerg Roedel
2018-02-13 21:40 ` Raj, Ashok
2018-02-13 22:53 ` Jacob Pan
2018-02-15 9:53 ` Joerg Roedel
[not found] ` <20180215095337.fccoozdclfnbepi4-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2018-02-15 16:38 ` Jacob Pan
2018-03-15 13:18 ` Joerg Roedel
[not found] ` <20180315131854.s6xmltsvsysublcw-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2018-03-19 16:37 ` Jacob Pan
2018-03-29 8:48 ` Joerg Roedel
[not found] ` <20180329084824.fvy7cg2wban4by4n-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2018-03-29 15:52 ` Gary R Hook
2018-03-29 16:05 ` Jacob Pan
2018-02-18 22:15 ` Yves-Alexis Perez
[not found] ` <1518992132.2542.5.camel-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
2018-02-20 22:25 ` Jacob Pan
2018-02-22 7:48 ` Yves-Alexis Perez
[not found] ` <1519285717.2388.11.camel-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
2018-02-22 17:09 ` Jacob Pan [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180222090929.12cc8344@jacob-builder \
--to=jacob.jun.pan-vuqaysv1563yd54fqh9/ca@public.gmane.org \
--cc=andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org \
--cc=ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=corsac-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org \
--cc=dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org \
--cc=fenghua.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=gayatri.kammela-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=ravi.v.shankar-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).