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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