Possible x2apic breakage

[Jack Steiner]

Suresh -

This popped up in Ingo's x86 tree yesterday. This appears to be breaking
on our simulator running in x2apic mode. If I understand the code,
this is a real breakage and not a problem in our simulator:


arch/x86/include/asm/genapic.h

	static inline unsigned int read_apic_id(void)
	{
        	unsigned int reg;

        	reg = *(u32 *)(APIC_BASE + APIC_ID);
        	return apic->get_apic_id(reg);
	}


As expected, the failure occurs right after:

	Enabling x2apic
	Enabled x2apic and interrupt-remapping

The next reference to apicid tries to read from mem instead of MSRs.


--- jack

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