From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Ian Campbell <ijc@hellion.org.uk>,
Brian Gerst <brgerst@gmail.com>,
Christian Kujau <lists@nerdbynature.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Jeremy Fitzhardinge <jeremy@goop.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.33-rc2: Xen/Guest switching to user mode with no user page tables
Date: Sun, 10 Jan 2010 16:49:51 +0300 [thread overview]
Message-ID: <20100110134951.GD5189@lenovo> (raw)
In-Reply-To: <20100110133628.GC5189@lenovo>
On Sun, Jan 10, 2010 at 04:36:28PM +0300, Cyrill Gorcunov wrote:
...
> >
> > With just the CS RPL fix below I see a GPF at kernel_thread_helper with
> > SS=3 (hence my hypothesis about NULL selectors and non-zero RPL above).
> > With both the SS and CS fixes things work fine.
>
> any of CS,SS loaded with NULL descriptor should lead to #GP
>
though SS with RPL=0 is allowed to be NULL descriptor in 64bit mode
> >
> > Ian.
> >
> > ---
> > Subject: xen: 64 bit kernel RPL should be 0.
> >
> ...
>
> Good catch Ian! I've noted that Xen use it's own get_kernel_rpl
> while discussing this problem in a chat. But I must admit *I simply don't know*
> what Xen does, or how it works internally (neither I have will to learn it at
> moment :)
>
> That said -- I'm happy if yor patch fixes problem (and it looks that
> get_kernel_rpl is guilty here indeed).
>
> -- Cyrill
-- Cyrill
next prev parent reply other threads:[~2010-01-10 13:49 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-06 1:03 2.6.33-rc2: Xen/Guest switching to user mode with no user page tables Christian Kujau
2010-01-06 3:38 ` Jeremy Fitzhardinge
2010-01-06 3:48 ` Christian Kujau
2010-01-06 5:14 ` Jeremy Fitzhardinge
2010-01-06 11:06 ` Christian Kujau
2010-01-06 11:21 ` Cyrill Gorcunov
2010-01-06 12:43 ` Christian Kujau
2010-01-07 19:06 ` Christian Kujau
2010-01-07 19:20 ` Cyrill Gorcunov
2010-01-07 19:31 ` Christian Kujau
2010-01-07 19:34 ` Cyrill Gorcunov
2010-01-07 19:19 ` H. Peter Anvin
2010-01-07 19:30 ` Christian Kujau
2010-01-08 21:50 ` Cyrill Gorcunov
2010-01-09 23:55 ` Christian Kujau
2010-01-10 1:50 ` Brian Gerst
2010-01-10 8:09 ` Cyrill Gorcunov
2010-01-10 12:59 ` Ian Campbell
2010-01-10 13:36 ` Cyrill Gorcunov
2010-01-10 13:49 ` Cyrill Gorcunov [this message]
2010-01-10 14:05 ` Ian Campbell
2010-01-15 8:36 ` Christian Kujau
2010-01-15 11:29 ` Ian Campbell
2010-01-15 12:03 ` Cyrill Gorcunov
2010-01-15 12:00 ` Cyrill Gorcunov
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=20100110134951.GD5189@lenovo \
--to=gorcunov@gmail.com \
--cc=brgerst@gmail.com \
--cc=hpa@zytor.com \
--cc=ijc@hellion.org.uk \
--cc=jeremy@goop.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lists@nerdbynature.de \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.