Re: [PATCH] perf/x86: fix RAPL rdmsrl_safe() usage

[Andi Kleen]

> > Acked-by: Borislav Petkov <bp@xxxxxxx>
> 
> Brown-Paper-Bag-Worn-By: Venkatesh Srinivas <venkateshs@xxxxxxxxxx>

Again the bug is really in KVM. We wouldn't need all this crap
if KVM didn't throw the bogus #GPs. I'm sure you missed plenty
of MSR accesses elsewhere, and it's a ticking time bomb.

If the VM lies to the kernel with the family-model you need to at 
least limit the consequences. KVM is spectacularly failing
to do that by throwing bogus #GPs.

The brown paper bad needs to be employed on the KVM code
(or better the bug be fixed there, by defaulting to not #GP
on unknown MSRs)

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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