after make several branch trace store(intel's BTS)  related msr can be accessed 
in guest, I can successfuly start branch trace store.
But I find APIC feature is not supported by cpuid,  my cpu is I3, I am sure it 
supports apic feature. So I pretend this feature is on, and connect
local vector table performance counter to an idt entry, but my interrupt 
service routine never called. I want to know is local apic  not supported
in virtualbox or I make some mistake in my programs. can someone help me?
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