Shobha Ranganathan wrote: > 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.
On stock kvm, the guest os programs a virtual apic that lives in qemu, not the real apic, so it would never cause any interrupt. Are you running with a modified kvm that allows the guest to touch the real apic? > 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? > It looks completely normal, assuming the host also programmed the timer to the same vector. Look in qemu/hw/apic.c to find your missing interrupt. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
