Re: [Xen-devel] Error booting Xen

[Shuai Ruan <shuai.ruan@xxxxxxxxxxxxxxx>]

On Wed, Jan 20, 2016 at 03:06:09AM -0700, Jan Beulich wrote:
> >>> On 19.01.16 at 20:55, <write.harmandeep@xxxxxxxxx> wrote:
Sorry for late response. I am away from the mail list for a couple
weeks.

> > I tried booting staging branch but results were identical. Following
> > line repeats endlessly.
> > (XEN) traps.c:3290: GPF (0000): ffff82d0801c1cce -> ffff82d080252e5c
> > 
> > $ '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?
Ok. I will look into this problem.
> 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.
> 
> Jan
> 

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