RE: [Xen-devel] xm save + restore crashes Windows 2008 32-bit (4.0.2-rc2-pre)

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> At 10:43 +0000 on 25 Jan (1295952215), James Harper wrote:
> > > > I should know if the problem exists on intel very soon. I'm
guessing
> > not
> > > > or I wouldn't be the first one posting about it... either that
or
> > there
> > > > is something else going on.
> > >
> > > It was on AMD that I saw it too.  If I read them correctly, Ian's
> > > regression tests are passing HVM save/restore for at least some
> > Windows
> > > versions on AMD too, so it may be very specific.
> > >
> >
> > Definitely AMD specific. Works fine on my Intel system.
> >
> > I'm guessing it's missing the save and/or restore of some critical
part
> > of the CPU state for the domain that causes an immediate crash when
> > return to user mode. Any suggestions as to where to start looking?
> 
> I'm trying to set it up here as well but I'm away from the office and
> getting the VGA console as far as my screen is proving tricky.
> 
> Can you try:
>  - xl pause <domid>
>  - xen-hvmctx <domid> >before
>  - xl save <domid> save-file
>  - xl restore -p save-file
>  - xl list
>  - xen-hvmctx <new-domid> >after
>  - diff -u before after
> 
> There should be a few differences to do with timers and TSCs but there
> might be some other smoking gun.  Of course it's possible that some
> piece of state got added that didn't get into the save/restore code at
> all.  It's also possible that some vital piece of memory isn't getting
> saved properly but that's less likely to be AMD-specific.
> 

I'll give it a go. I tried using some of the xl tools the other day but
it wasn't working. xl save seemed to go okay but xl restore just gave
errors. That might be a clue in itself though... is xl considered stable
for 4.0.2?

James

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