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SubjectRE: 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 ?
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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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