linux-kernel - Re: [PATCH 3/5] x86, AMD: cleanup: merge common code in early microcode loading

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Date:	Thu, 8 Aug 2013 19:49:06 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>
Cc:	Torsten Kaiser <just.for.lkml@...glemail.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] x86, AMD: cleanup: merge common code in early
 microcode loading

On Wed, Aug 07, 2013 at 11:34:01PM +0000, Yu, Fenghua wrote:
> > This check won't work when CPU0 is hot added. So we need to find a
> > better way to fix this.
> > 
> 
> Maybe need to change the check as follows to take care of CPU0 hot add case?
> 
> if ((cpu && system_state == SYSTEM_BOOTING) || (system_state == SYSTEM_RUNNING))
> 	load_ucode_ap();

Ok, just for my own understanding - I haven't played with cpu hotadd yet
so when you do this, is the hot-added socket containing the BSP not cpu
0 anymore?

Or when you hot-remove the socket containing the BSP, another AP becomes
the BSP and preserves its old number?

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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