Messages in this thread | | | Date | Sat, 6 Oct 2018 20:39:28 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH v1 1/2] x86/cpufeature: Add facility to match microcode revisions |
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On Sat, Oct 06, 2018 at 11:15:07AM -0700, Andi Kleen wrote: > The matcher can be used to match specific hardware steppings by setting > the min/max_ucode to 0 or specific microcode revisions > (which are associated with steppings)
This better be explained unambiguously.
> We still support the old microcode interface that allows updates > per CPU, and also it could happen during CPU hotplug.
There are no per CPU microcode updates anymore - it is all or none.
It is actually your microcoders who came up with a bunch of restrictions like quiescing the cores from doing *anything*, blocking hotplug, prohibiting updates if a subset of the cores is not online and still not guaranteeing it'll work all the time because <reasons>.
The actually very simple reason being it is just too late for microcode update when the machine is up. Where all I wanna do is rip the damn thing out completely.
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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