Comment 10 for bug 1755624

Steve Beattie (sbeattie) wrote :

Hi dino99,

Microcode rev 0xc2 looks to be the correct revision for your processor:

  $ iucode-tool -L microcode-20180312.dat | grep 506e3
    01/147: sig 0x000506e3, pf mask 0x36, 2017-11-16, rev 0x00c2, size 99328

(You can perform a similar check on the specific microcode for your processor on the file in the installed package:

  $ iucode-tool -L /lib/firmware/intel-ucode/06-5e-03
  microcode bundle 1: /lib/firmware/intel-ucode/06-5e-03
    001/001: sig 0x000506e3, pf_mask 0x36, 2017-11-16, rev 0x00c2, size 99328

)

And in the detailed description from https://downloadcenter.intel.com/download/27591/Linux-Processor-Microcode-Data-File:

  SKL R0 6-5e-3:36 ba->c2

Processor model 0x5e is defined as

  #define INTEL_FAM6_SKYLAKE_DESKTOP 0x5E

in the kernel, and looking at the upstream kernel, microcode version 0xc2 for INTEL_FAM6_SKYLAKE_DESKTOP is still blacklisted as being unfixed for spectre:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/cpu/intel.c#n126

So unfortunately, this all looks correct for your processor.