From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: Error booting Xen
Date: Thu, 21 Jan 2016 16:14:02 +0100
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To: Jan Beulich <JBeulich@suse.com>, Harmandeep Kaur <write.harmandeep@gmail.com>, Shuai Ruan <shuai.ruan@linux.intel.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, xen-devel@lists.xen.org
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On Wed, 2016-01-20 at 03:06 -0700, Jan Beulich wrote:
> > > > On 19.01.16 at 20:55, <write.harmandeep@gmail.com> wrote:
> >=C2=A0
> > $ 'addr2line -e xen-syms ffff82d0801c1cce' returns
> > 'xen/xen/arch/x86/xstate.c:387' which again points to
> > xsave. Also, adding 'xsave=3D0' makes it boot just fine.
>=20
> Ah, I think I see the issue: We're zeroing the entire save area in
> the fixup code, which will make XRSTORS fault unconditionally.
> Shuai, would you please look into possible ways of fixing this?
> Just setting the compressed flag may not be enough, and falling
> back to plain XRSTOR doesn't seem to be an option either - I'm in
> particular worried that the current model of zeroing everything
> is bogus with the growing number of different components which
> get loaded here.
>=20
> But of course another question then is why the XRSTORS faults
> in the first place. I guess we'll need a debugging patch to dump
> the full state to understand that.
>=20
If someone can produce and send such patch, I'm sure Harmandeep will be
happy to give it a try on her hardware.

Thanks and Regards,
Dario
--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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