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Re: [Xen-devel] Error booting Xen

On Thu, Jan 21, 2016 at 8:44 PM, Dario Faggioli
<dario.faggioli@xxxxxxxxxx> wrote:
> On Wed, 2016-01-20 at 03:06 -0700, Jan Beulich wrote:
>> > > > On 19.01.16 at 20:55, <write.harmandeep@xxxxxxxxx> wrote:
>> >
>> > $ 'addr2line -e xen-syms ffff82d0801c1cce' returns
>> > 'xen/xen/arch/x86/xstate.c:387' which again points to
>> > xsave. Also, adding 'xsave=0' makes it boot just fine.
>> 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.
>> 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.
> If someone can produce and send such patch, I'm sure Harmandeep will be
> happy to give it a try on her hardware.

Yes, sure. I will be more than happy to do this :)
Thank you Dario.

> Thanks and Regards,
> Dario
> --
> <<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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