linux-kernel - [PATCH v13 0/4] fw_cfg: add DMA operations & etc/vmcoreinfo support

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Date:   Wed,  7 Feb 2018 02:35:21 +0100
From:   Marc-André Lureau <marcandre.lureau@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     slp@...hat.com, bhe@...hat.com, mst@...hat.com, somlo@....edu,
        xiaolong.ye@...el.com,
        Marc-André Lureau <marcandre.lureau@...hat.com>
Subject: [PATCH v13 0/4] fw_cfg: add DMA operations & etc/vmcoreinfo support

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).

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 (4):
  crash: export paddr_vmcoreinfo_note()
  fw_cfg: add DMA register
  fw_cfg: write vmcoreinfo details
  RFC: fw_cfg: do DMA read operation

 drivers/firmware/qemu_fw_cfg.c | 257 ++++++++++++++++++++++++++++++++++++-----
 kernel/crash_core.c            |   1 +
 2 files changed, 230 insertions(+), 28 deletions(-)

-- 
2.16.1.73.g5832b7e9f2