Messages in this thread | | | Subject | Re: [tip:x86/pti] x86/speculation: Use IBRS if available before calling into firmware | From | David Woodhouse <> | Date | Mon, 19 Feb 2018 09:29:12 +0000 |
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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?[unhandled content-type:application/x-pkcs7-signature] | |