[elrepo] kernel-lt and microcode updates

[Orion Poplawski]

Hello -

I was poking around and noticed some differences in microcode output in dmesg
between the stock EL7 kernel and kernel-lt:

dmesg-3.10.0-1127.10.1.el7.x86_64:
[    0.000000] microcode: microcode updated early to revision 0xd6, date =
2019-10-03
[    5.997673] microcode: sig=0x406e3, pf=0x80, revision=0xd6
[    5.998518] microcode: Microcode Update Driver: v2.01
<tigran at aivazian.fsnet.co.uk>, Peter Oruba
[    0.000000] microcode: microcode updated early to revision 0xd6, date =
2019-10-03
[    6.035419] microcode: sig=0x406e3, pf=0x80, revision=0xd6
[    6.035503] microcode: Microcode Update Driver: v2.01
<tigran at aivazian.fsnet.co.uk>, Peter Oruba
[   25.411983] microcode: updated to revision 0xdc, date = 2020-04-27

dmesg-4.4.227-1.el7.elrepo.x86_64:
[    0.052043] SRBDS: Vulnerable: No microcode
[    0.052066] MDS: Vulnerable: Clear CPU buffers attempted, no microcode
[    1.807176] microcode: CPU0 sig=0x406e3, pf=0x80, revision=0xc6
[    1.807189] microcode: CPU1 sig=0x406e3, pf=0x80, revision=0xc6
[    1.807210] microcode: CPU2 sig=0x406e3, pf=0x80, revision=0xc6
[    1.807230] microcode: CPU3 sig=0x406e3, pf=0x80, revision=0xc6
[    1.807312] microcode: Microcode Update Driver: v2.01
<tigran at aivazian.fsnet.co.uk>, Peter Oruba

This leads me to believe that the microcode is not getting updated when using
the elrepo lt kernel.  Is that expected?

Thanks,

   Orion

-- 
Orion Poplawski
Manager of NWRA Technical Systems          720-772-5637
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       orion at nwra.com
Boulder, CO 80301                 https://www.nwra.com/

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