On Mon, 2018-02-19 at 10:20 +0100, Peter Zijlstra wrote: > > I did not update or otherwise change packages while I was bisecting; the > machine is: > > vendor_id : GenuineIntel > cpu family : 6 > model : 62 > model name : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz > stepping : 4 > microcode : 0x428
That's IVX with a microcode that doesn't *have* IBRS/IBPB. I don't think there's a publicly available microcode that does; I assume you didn't have one and build it into your kernel for early loading, and thus you really weren't even using IBRS here? The code never even gets patched in?
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