Messages in this thread | | | Subject | Re: [PATCH v2 2/6] x86, mm, pat: Change reserve_memtype() to handle WT | From | Toshi Kani <> | Date | Wed, 10 Sep 2014 15:47:53 -0600 |
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On Wed, 2014-09-10 at 14:39 -0700, H. Peter Anvin wrote: > On 09/10/2014 02:27 PM, Andy Lutomirski wrote: > >> > >> That's possible, but the only benefit is that we can enable WT on > >> pre-PAT systems, which I do not think anyone cares now... WB & UC work > >> on pre-PAT systems. WC & WT need PAT. I think this requirement is > >> reasonable. > > > > It might end up being a cleanup, though. A whole bunch of > > rarely-exercised if (!pat_enabled) things would go away. > > > > Yes. Don't think of it as PAT vs non-PAT. Think of it as a specific > set of cache types available on different processors. The fact that you > may have to frob an MSR to initialize it is almost trivial in comparison.
Right.
Thanks, -Toshi
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