VT-x and Performance counter interrupt in KVM mode

[Shobha Ranganathan <rvshobha-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>]

I am trying to capture in vmx.c the hardware
performance counter(PMU) interrupt of a i386 Linux
kernel running with perfmon on a Core 2 Duo machine
running with kvm-15. host is running kvm with VT-x in
x86-64 mode.

The PMU interrupt is programmed in the APIC LVT entry
(set to 0xee)by the guest OS. Similarly, an IDT entry
connects the interrupt vector to the interrupt
handler.
I am not able to catch, in kvm, the PMU interrupt
happening in VMX non-root mode. It does not seem to
appear in the VM-exit interruption information nor in
the IDT-vectoring information. It does not seem to
be caught by any of the exit handlers yet the host PMU
interrupt handler catches it which is not what we
want.

Any idea on what is going on with this interrupt?

Thanks
shobha



 
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