Hi, 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).
v14: - 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 fw_cfg_read_blob_dma() - add error handling to fw_cfg_read_blob() callers - minor stylistic changes v13: - reorder patch series, introduce DMA write before DMA read - do some measurements of DMA read speed-ups v12: - 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) v11: - 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 -- 2.16.1.73.g5832b7e9f2
