This patch series introduces support of loading external blocks of firmware into a guest. These blocks can currently contain SMBIOS and/or ACPI firmware information that is used by HVMLOADER to modify a guests virtual firmware at startup. These modules are only used by HVMLOADER and are effectively discarded after HVMLOADER has completed. The domain building code in libxenguest is passed these firmware blocks in the xc_hvm_build_args structure and loads them into the new guest, returning the load address. The loading is done in what will become the guests low RAM area just behind to load location for HVMLOADER. After their use by HVMLOADER they are effectively discarded. It is the caller''s job to load the base address and length values in xenstore using the paths defined in the new hvm_defs.h header so HVMLOADER can located the blocks. Currently two types of firmware information are recognized and processed in the HVMLOADER though this could be extended. 1. SMBIOS: The SMBIOS table building code will attempt to retrieve (for predefined set of structure types) any passed in structures. If a match is found the passed in table will be used overriding the default values. In addition, the SMBIOS code will also enumerate and load any vendor defined strutures (in the range of types 128 - 255) that as are passed in. See the hvm_defs.h header for information on the format of this block. 2. ACPI: Static and secondary descriptor tables can be added to the set of ACPI table built by HVMLOADER. The ACPI builder code will enumerate passed in tables and add them at the end of the secondary table list. See the hvm_defs.h header for information on the format of this block. There are 4 patches in the series: 01 - Add definitions header for HVM firmware passthrough support. 02 - Xen control tools support for loading the firmware blocks. 03 - Passthrough support for SMBIOS. 04 - Passthrough support for ACPI. Note this is version 5 of this patch set. The only change is that the firmware passthrough header file was renamed and moved: xen/include/public/hvm/hvm_xs_strings.h Signed-off-by: Ross Philipson <ross.philipson@citrix.com> (Based on xen-4.3 staging/unstable cs 26340)