Am 2015-04-29 um 18:47 schrieb Bandan Das:
> 
> Why do we allow writes to APIC_ID ? On all _newer_ processors, it's
> read only. The spec doesn't explicitly mention it though, or atleast
> I couldn't find it. Does userspace have a reason to modify it ?

The APIC ID is read-only for x2APIC. It remains R/W for xAPIC.

Jan

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Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
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