Messages in this thread | | | From | "Zhang, Lin-Bao (Linux Kernel R&D)" <> | 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 ? | Date | Wed, 19 Dec 2012 10:36:00 +0000 |
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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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