Jun Koi wrote: > Hi, > > I am investigating the possibility of debugging guest kernel with KVM. > Anybody may shed some lights into how KVM handles breakpoints? > > Suppose that we put a breakpoint (0xCC opcode in x86) into guest > kernel. When the kernel hits the breakpoint, which one will handle the > event? > > Looks like qemu will handle the breakpoint first, then next the guest > kernel itself have a chance to process it. Is that correct? > > And is there any chance for the host (VMM) to get notified about the event? > >
kvm supports using hardware breakpoints to debug a guest. See the KVM_GUEST_DEBUG ioctl. The modified qemu shipped with kvm allows gdb to connect and debug a kvm guest. It's been a long while since I tested this, so it may or may not work. -- 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
