Re: [PATCH] x86, msr: Allow read access to /dev/cpu/X/msr

[Henrique de Moraes Holschuh]

On Sun, 28 Jun 2015, Prarit Bhargava wrote:
> Is it easier to blacklist MSRs we don't want generally exposed, or only expose
> the ones that we think are safe?  That's sort of a devil's advocate sort of
> question ;) and I'm wondering what the shorter list is.

The only way to make MSR access safe is to allow it only by whitelisting.
The x86 platform restricts all MSR access to ring 0 for a damn good reason.

Also, such a whitelist would most likely need to be vendor and model-aware,
and to differentiate "allow reads" from "allow writes"...

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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