Messages in this thread | | | Date | Tue, 5 Feb 2019 16:43:09 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v3 08/10] x86/setcpuid: Add kernel option setcpuid |
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On Tue, Feb 05, 2019 at 07:19:16AM -0800, Dave Hansen wrote: > This is one of the few times that we're pretty confident that folks will > use this. The reason we're going to this trouble is that the split lock > detection is wanted by actual customers, and they want it before it's > implemented on a processor with real enumeration. > > This isn't something we want everybody and their grandma to turn on; > it's a rather specialized feature. It's really only for folks that care > about the latency incurred across the entire system on split lock > operations.
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> It's not for developers. This really is for (somewhat niche) end users > that want split lock detection in production. This is all really an > effort to get them running mainline or real distro kernels.
This all sounds to me like it shouldn't even be mainline but in a special, evaluation kernel. If anything, it should be default off and be opted-in by a cmdline switch. None of that *cpuid=* toggling dance.
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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