Re: [PATCH] xen: core dom0 support

[H. Peter Anvin]

Ingo Molnar wrote:
> 
> Since it's the same kernel image i think the only truly reliable 
> method would be to reboot between _different_ kernel images: 
> same instructions but randomly re-align variables both in terms 
> of absolute address and in terms of relative position to each 
> other. Plus randomize bootmem allocs and never-gets-freed-really 
> boot-time allocations.
> 
> Really hard to do i think ...
> 

Ouch, yeah.

On the other hand, the numbers made sense to me, so I don't see why
there is any reason to distrust them.  They show a 5% overhead with
pv_ops enabled, reduced to a 2% overhead with the changed.  That is more
or less what would match my intuition from seeing the code.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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