Possible x2apic breakage
From: Jack Steiner
Date: Thu Jan 29 2009 - 10:41:58 EST
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/