Messages in this thread | | | Date | Fri, 19 Sep 2014 10:03:22 +0200 | From | Borislav Petkov <> | Subject | Re: x86, microcode: BUG: microcode update that changes x86_capability |
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On Thu, Sep 18, 2014 at 06:00:12PM -0700, Andy Lutomirski wrote: > Yes, but how? I assume that BIOS isn't switching between two > different ucode blobs, and I don't know about any wrcpuid instruction. > So there must be *some* way, at least on new ucode (and maybe on old > ucode) to change that bit.
I'd venture a guess that WRMSR to some reg should give you that, if they expose it.
-- Regards/Gruss, Boris. --
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