[Crash-utility] [extension module] extension module for translating KVM guest's physical address to host's address

Hi Dave and manager of qemu-discuss, I have implemented an extension module for translating KVM guest's physical address to host's address. The related command is "qemu-vtop". The attachment is the code I implemented. Please copy the file to the crash-<version>/extensions subdirectory and from the top-level crash-<version> directory, enter: $ make extensions (please refer to http://people.redhat.com/anderson/extensions.html) To add the module's command(s) to a running crash session, enter: crash> extend qemu-vtop.so "mod -s kvm" is needed to load kvm debug-info to offer some data to qemu-vtop command. The command uses information of struct "kvm_memslots" to get the relationship between gpa and hva. Struct "kvm_memslots" is holded by a file, called "anon_inode:kvm-vm", opened by qemu-kvm. Then, "do_vtop" is called to get hpa. About the detailed implementation, please refer to attachment. The functionality is limited, but I think it is useful when debugging a qemu-kvm virtual machine. So I post it. -- -- Regards Qiao Nuohan