Re: [v2 01/13] x86/microcode/intel: Prevent printing updated microcode rev multiple times

[Ashok Raj]

Hi Boris,

On Mon, Nov 07, 2022 at 07:47:37PM +0100, Borislav Petkov wrote:
> On Mon, Nov 07, 2022 at 04:12:59PM +0000, Ashok Raj wrote:
> > Only missing is the ucode date, not a big deal missing it.
> 
> Yes, it isn't. One can find it out another way:
> 
> $ iucode-tool -l /lib/firmware/intel-ucode/06-9c-00
> microcode bundle 1: /lib/firmware/intel-ucode/06-9c-00
> selected microcodes:
>   001/001: sig 0x000906c0, pf_mask 0x01, 2022-02-19, rev 0x24000023, size 20480
>   					 ^^^^^^^^^^

That's correct, my thought as well. Did you get a chance to review rest of
the patches? 

Thought I'll wait for more comments before I send the next rev.

Patch2 is a simple fix that you suggested.

Patch3 is a bug fix. I suspect some earlier upstream reports of ucode 
failure after update (early loading) might be related. The symptom is 
similar, but those are too old to followup. I got into a similare situation
when i tried to update an incompatible uCode from initrd and system hung.

I'm not positive, but seems highly likely. The following are early loading
failures, not late loading.

https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1911959

https://forums.linuxmint.com/viewtopic.php?p=1827032#1827032

https://askubuntu.com/questions/1291486/boot-crash-after-latest-update-of-intel-microcode-nov-11-2020

Patch 4 is also a bugfix, today when we reload the same ucode even though
nothing changes it seems to think some feature is new. When i added some
more debug it turned out SGX was probably turned off by OS, but enumerated
by microcode. So it always reports 

Cheers,
Ashok