linux-kernel - Re: [PATCH 2/5] x86/microcode: Simplify init path even more

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Date:   Thu, 20 Oct 2022 08:04:53 -0700
From:   Ashok Raj <ashok.raj@...el.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Tony Luck <tony.luck@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Arjan van de Ven <arjan.van.de.ven@...el.com>,
        Jacob Jun Pan <jacob.jun.pan@...el.com>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH 2/5] x86/microcode: Simplify init path even more

On Thu, Oct 20, 2022 at 10:18:01AM +0200, Borislav Petkov wrote:
> On Wed, Oct 19, 2022 at 09:37:59PM +0200, Borislav Petkov wrote:
> > Ah ok, yes, I need to check ->request_microcode_fw's retval.
> 
> On a second thought, no I don't have to: the request routine will try to
> load any new microcode but if it fails, ->apply_microcode later simply
> won't find it in the cache. And that's perfectly fine.
> 
> setup_online_cpu() still needs to run on each CPU unconditionally,
> though, in order to setup the sysfs groups.

That's true, its benign for this step.

I tried rebase everything I have, (i need to drop 2 of my patches after
your 5 patch series is applied on top of 6.1.0-rc1. 

Everything works fine, which is good news.

Except I can't get this new load you added in microcode_init() to work. 
It always gets UCODE_NFOUND.

- BIOS had version X
- Early applied Y > X
- I copied a new version Z > Y. 

But i only see the early loaded version. I haven't looked at it yet, but
will try to look today. 

Cheers,
Ashok