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Date:	Wed, 19 Dec 2012 10:36:00 +0000
From:	"Zhang, Lin-Bao (Linux Kernel R&D)" <>
To:	Yinghai Lu <>
CC:	"" <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>, "" <>,
	"" <>,
	"" <>,
	"" <>,
	"" <>
Subject: RE: Why Linux kernel forced to enter X2APIC mode( just because of
 booting cpu has supported x2apic) without depending on BIOS' setting in
 MSR->x2apic enablement bit ?

Hi Yinghai , 
Actually ,my question like this: 
OS can really enable x2apic correctly without BIOS' help in this case : 
BIOS has claimed definitely it doesn't enable x2apic ,but OS feel it can enable x2apic(based on BSP supports x2apic) ).

If Linux don't need BIOS' help , how did linux kernel reach this action? 
I am reading this related code, I just see Linux kernel judge cpu_has_x2apic() ,if yes, it will set MSR, certainly , IR works right. 
We can think BIOS' supporting is not necessary ? 

Thanks very much . 
-- Bob(LinBao Zhang)
HP linux kernel enginner

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