Re: [Xen-devel] State of GPLPV and Windows 8

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

> > >
> > > Windows 8 doesn't actually shut down when you tell it to... It terminates
> > > all
> > > sessions apart from 0 (where services live) and then hibernates, so
> > > 'shutdown' is actually a lot more complex and error prone than it was
> > > before.
> > >
> >
> > I've gotten it all working now, but the restore from hibernate (which
> > appears
> > to use qemu) is slow. The hibernate on a 1GB machine takes seconds but
> > the restore takes over a minute.
> >
> 
> Yes, I've noticed Windows 8 seemingly taking a lot longer to load/restore
> than previous versions but never dug into it. I'm assuming it's going to be
> some suboptimal int13 handing, or maybe Windows 8 is bypassing the f/w
> and driving the IDE device itself?
> 

Direct IDE seems a bit risky... it's all black box stuff though so anything 
goes :)

I've been doing a bit more reading and it seems that win8 is able to involve 
the storport drive in the restore process too, I think. From 
http://msdn.microsoft.com/en-us/library/windows/hardware/ff563901%28v=vs.85%29.aspx

DumpMode
A value indicating the use of the miniport during dump mode. This member is 
included starting with Windows 8. It can have one of the following values.
DUMP_MODE_CRASH - The miniport in dump mode is used for a crashdump.
DUMP_MODE_HIBER - The miniport in dump mode is used for a hibernation.
DUMP_MODE_MARK_MEMORY - The miniport in dump mode is used for marking required 
memory.
DUMP_MODE_RESUME - The miniport in dump mode is used for a resume from 
hibernation.

In order to play with that I'd need to download the win8 DDK (the visual studio 
based one) which I'm not real keen on doing just yet...

James


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