[patch 0/3 v2] kexec-tools: efi runtime support

[dyoung at redhat.com]

This patchset is for adding efi runtime support on kexec kernel
kernel patches see below thread:
http://thread.gmane.org/gmane.linux.kernel.efi/2491

in kexec-tools, this patchset will do below:
1. retrieve efi_info from debugfs boot_params, and fill the
x86 setup header

2. collect data efi runtime needed:
/sys/firmware/efi/systab: fw_vendor, runtime, config_tables and smbios
/sys/firmware/efi/efi-runtime-map/*, the phys-virt mappings in 1st kernel

3. assemble setup_data based on data get in 2) then pass it to 2nd kernel

Tested on OVMF, dell laptop, lenovo laptop and HP workstation

Please help to review

V2 changelog:
Address comments from
Simon:
  coding style, fixed a mem leak
HPA:
  use type uint64_t instead of __uint64_t
mjg:
  do not cause regression for loading old kernel
  use xloadflags to check the bzImage support for efi.
  in case old kernel, do not pass efi_info and setup_data
  for new kernel, do not pass acpi_rsdp
Vivek:
  suggest to export a value in bzImage probe for efi support
  so it can be used to check if we should pass acpi_rsdp.

--
Thanks
dave