Re: debug and breakpoint interrupts handling?

>I am wondering how KVM handles debug and breakpoint interrupt? Does it
>process them like normal NMI interrupt, or is there any special
>processing?
>

I haven't use it but KVM does support qemu'd gdbstub. Both single step
and breakpoint are possible. From the source code (vmx.c) it seems like
handle_exception function handle them as regular exceptions (non nmi).

The breakpoint set path starts from gdbsutb.c-> exec.c:
cpu_breakpoint_insert -> Qemu-kvm.c: kvm_update_debugger
Call an ioctl from Kvmctl.c:kvm_guest_debug that runs
Vmx.c:set_guest_debug 

HTH, Good luck,
        Dor.

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