This series adds DMA operations support to the qemu fw_cfg kernel
module and populates "etc/vmcoreinfo" with vmcoreinfo location
details (entry added since qemu 2.11 with -device vmcoreinfo).

- add "fw_cfg: add a public uapi header"
- fix sparse warnings & don't introduce new warnings
- add memory barriers to force IO ordering
- split fw_cfg_read_blob() in fw_cfg_read_blob_io() and
- add error handling to fw_cfg_read_blob() callers
- minor stylistic changes

- reorder patch series, introduce DMA write before DMA read
- do some measurements of DMA read speed-ups

- fix virt_to_phys(NULL) panic with CONFIG_DEBUG_VIRTUAL=y
- do not use DMA read, except for kmalloc() memory we allocated
  ourself (only fw_cfg_register_dir_entries() so far)

- add #include <linux/crash_core.h> in last patch,
  fixing kbuild .config test

Marc-André Lureau (9):
  crash: export paddr_vmcoreinfo_note()
  fw_cfg: add a public uapi header
  fw_cfg: fix sparse warnings in fw_cfg_sel_endianness()
  fw_cfg: fix sparse warnings with fw_cfg_file
  fw_cfg: fix sparse warning reading FW_CFG_ID
  fw_cfg: fix sparse warnings around FW_CFG_FILE_DIR read
  fw_cfg: add DMA register
  fw_cfg: write vmcoreinfo details
  RFC: fw_cfg: do DMA read operation

 MAINTAINERS                    |   1 +
 drivers/firmware/qemu_fw_cfg.c | 333 +++++++++++++++++++++++++++++++++--------
 include/uapi/linux/fw_cfg.h    | 102 +++++++++++++
 kernel/crash_core.c            |   1 +
 4 files changed, 374 insertions(+), 63 deletions(-)
 create mode 100644 include/uapi/linux/fw_cfg.h


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