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Re: [Xen-devel] Error booting Xen

The patch as I already said is letting me boot
into the Xen, but the system is now resetting
stating XSAVE as the cause. I have attached
links to two cases where system was reset as
the result. I don't think that problem is fully
solved yet.


On Tue, Jan 26, 2016 at 6:21 PM, Harmandeep Kaur
<write.harmandeep@xxxxxxxxx> wrote:
> Hi guys,
> I tried the patch and I am very happy to inform you
> all that the patch has solved my problem. Now I am
> able to boot Xen without disabling XSAVE. I have
> full log of boot at http://paste2.org/gVW0Z9nm (if
> any one is interested. also "XXX Hello, this is my
> first mod :)" is printed by my mod, so ignore that
> one).
> Thank you guys for your help.
> Regards,
> Harman
> On Mon, Jan 25, 2016 at 7:12 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>>> On 21.01.16 at 16:14, <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.
>> So here you go. Instead of a debugging one, I hope I have at
>> once fixed the issue in a suitable way. Whether we'd like to keep
>> the debugging output we can decide later on.
>> Both patches need to be applied; while the order shouldn't matter,
>> the alignment one is a prereq to the actual change.
>> Jan

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