Public bug reported:

With an intel-microcode package based off of
Microcode-Data-File, when booting, the kernel 4.15.0-10.11-generic
reports the following in dmesg:

[    0.000000] microcode: microcode updated early to revision 0x84, date = 
[    0.000000] Intel Spectre v2 broken microcode detected; disabling 
Speculation Control

And indeed, none of ibrs, ibpb, or stibp show up in /proc/cpuinfo. Other
testers of the updated microcode report seeing the same thing.

The processor this is being tested on is:

cpu family      : 6
model           : 142
model name      : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
stepping        : 9
microcode       : 0x84

The test for the microcode is in
; specifically, it looks like bad_spectre_microcode(c) is returning

It seems
has not been pulled in yet (though it's staged as
3e442a86b70eea274d01569244584d91e2f287e7 in bionic/master-next and is in
4.15.0-12.13 in bionic-proposed), which addresses things for Kaby Lake
processors, but other processers may need to be verified for

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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  With intel-microcode 3.20180312, kernel reports as broken spectre v2

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