Re: [Lguest] lguest: unhandled trap

[H. Peter Anvin]

Ian Campbell wrote:
> Wasn't there some concern about BIOSes which don't correctly reserve
> their DMI tables? Or don't even have e820 maps? H. Peter once said:
>
> > It's pretty standard for 0xf0000...0x100000 to be marked RESERVED in
> > E820 on real hardware (including the system I'm typing on right now.)
> > It is so marked to indicate that hardware cannot be mapped into that
> > space.  However, you can't rely on this fact -- heck, you can't rely on
> > E820 even existing on a real machine.  I have specimens of real-life
> > machines that go both ways.

Not only that, but the ACPI spec states explicitly that the ISA magic 
areas should be handled without relying on E820.

	-hpa
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