Re: [PATCH] x86: trim ram need to check if mtrr is there v2

[H. Peter Anvin]

Ingo Molnar wrote:
> * Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
>
> > is_cpu(INTEL) already make sure we have mtrr_if got assigned and 
> > cpu_has_mtrr.
> >
> > may need to fix qemu instead...
>
> no ...
>
> lets not do non-sensical trimming of RAM, ok? Emit a warning but never 
> trim all of RAM and make the system unbootable. Trimmed RAM is something 
> that users can pester board/BIOS vendors with. Non-booting kernels is 
> something _we_ get pestered with ;-)

*And* let's push a fix to Qemu/KVM as appropriate.

Last I checked Qemu never even turns caching on in %cr0, never mind gets 
the MTRRs right.  If it's advertising MTRRs, this is a problem.

	-hpa
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