From: Ian Campbell <ian.campbell@citrix.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Andreas Sundstrom <sunkan+lists.xen-devel@zappa.cx>,
xen-devel@lists.xen.org
Subject: Re: [BUG] XEN domU crash when PV grub chainloads 32-bit domU grub
Date: Tue, 22 Sep 2015 09:52:35 +0100 [thread overview]
Message-ID: <1442911955.10338.116.camel@citrix.com> (raw)
In-Reply-To: <560101D2.5060005@citrix.com>
On Tue, 2015-09-22 at 08:22 +0100, Andrew Cooper wrote:
>
> The segment registers indicate that the domU is executing in ring1 which
> makes it a 32bit guest (also why 32bit words are used for the stack
> dump), but r10 through r14 have 64bit values in.
r10..r14 are not visible to 32-bit guests but it appears that this dumping
function in Xen doesn't check for that and omit printing them.
I suspect that if these were zeroed or poisoned upon domain creation you
would see those values unmodified here.
> It does appear to be an intermittent bug in 32bit grub-xen in the
> eventual domU, but I have no help to offer with respect to debugging
> grub-xen further.
Me neither. I did suggest to Andreas that he also took it to grub-devel.
I'll reply to the original with a full quote and copy that list.
Ian.
next prev parent reply other threads:[~2015-09-22 8:52 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 20:03 [BUG] XEN domU crash when PV grub chainloads 32-bit domU grub Andreas Sundstrom
2015-09-22 7:22 ` Andrew Cooper
2015-09-22 8:52 ` Ian Campbell [this message]
2015-09-22 13:26 ` Andreas Sundstrom
2015-09-22 8:53 ` Ian Campbell
2015-09-22 22:37 ` Samuel Thibault
2015-09-23 8:34 ` Ian Campbell
2015-09-23 12:47 ` Andreas Sundstrom
2015-09-23 14:18 ` Ian Campbell
2015-09-24 17:28 ` Andreas Sundstrom
2015-09-25 8:36 ` Ian Campbell
2015-09-25 13:23 ` Andreas Sundstrom
2015-09-23 8:37 ` Andreas Sundstrom
[not found] ` <1442912018.10338.118.camel@citrix.com>
2016-01-22 12:56 ` Vladimir 'φ-coder/phcoder' Serbinenko
[not found] ` <56A226F8.3020301@gmail.com>
2016-01-22 13:01 ` Andrew Cooper
[not found] ` <56A22847.3020708@citrix.com>
2016-01-22 13:08 ` Vladimir 'φ-coder/phcoder' Serbinenko
[not found] ` <56A229DA.7030904@gmail.com>
2016-01-22 13:43 ` Andrew Cooper
2016-01-22 17:44 ` Andreas Sundstrom
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