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    Subject[PATCH v5 00/14] kexec kernel efi runtime support
    Date
    Hi,

    Here is the V5 patchset for supporting kexec kernel efi runtime.
    Per pervious discussion I pass the 1st kernel efi runtime mapping
    via setup_data to 2nd kernel. Besides of the runtime mapping
    info I also pass the fw_vendor, runtime, config table, smbios
    physical address in setup_data. EFI spec mentioned fw_vendor,
    runtime, config table addresses will be converted to virt address
    after entering virtual mode, but we will use it as physical address
    in efi_init. For smbios EFI spec did not mention about the address
    updating, but during my test on a HP workstation, the bios will
    convert it to Virt addr, thus pass it in setup_data as well.

    For fw_vendor, runtime, config table, I export them in /sys/firmware/
    efi/, smbios is already in /sys/firmware/efi/systab.

    For efi runtime mapping I add a new directory /sys/firmware/efi/
    runtime-map/ like below
    [dave@darkstar ~]$ tree /sys/firmware/efi/runtime-map/
    /sys/firmware/efi/runtime-map/
    |__ 0
    | |__ attribute
    | |__ num_pages
    | |__ phys_addr
    | |__ type
    | |__ virt_addr
    |__ 1
    [snip]

    kexec-tools will assemble them as setup_data and pass to 2nd kernel.
    I will send userspace patches as well.

    Limitation is I only write support for x86_64, test on below machines:
    Lenovo thinkpad t420
    Dell inspiron 14 - 3421
    HP Z420 workstation
    Qemu + OVMF

    The patches are based on linus tree + matt's efi master tree

    Changes from v1:
    add one flag in xloadflags, so kexec-tools can safely load old kernel
    without efi support.
    coding style fixes
    function name for map phys_addr to fixed virt_addr
    Add ABI documentation for sysfs files

    Changes from v2:
    01/09: a new patch to remove unused variables in __map_region function
    catched by Toshi Kani
    09/09: a new patch to export x86 boot_params to sysfs instead of use
    debugfs files
    Matt: reuse __map_region instead do same thing in another function.
    add a wrapper function efi_map_region_fixed [02/09]
    check return value of krealloc
    sysfs dir name s/efi-runtime-map/runtime-map [06/09]
    use desc_size in efi_runtime_map
    for the xloadflags defination: +&& defined(CONFIG_KEXEC)
    Greg: sysfs : one file one value for fw_vendor, runtime, tables. [05/09]
    Document them in ABI testing
    HPA: Document the new xloadflag
    Also there's other function cleanup and improvement for error handling.

    Changes from v3:
    Greg: sysfs code move to use __ATTR_RO and attr_group
    Boris: comments and code alignment

    Added 3 new patches below
    10-print-efi-runtime-memmap.patch
    - 10/12: print only runtime ranges in case EFI_DEBUG printing
    11-reserve-setup-data-late.patch
    - fix a bug of kdump kernel, move function for reserving setup data
    ranges late after parsing memmap= cmdline params because kdump kernel
    will pass exact memmap late.
    12-x86-kdebugfs-use-ioremap.patch
    - fix a bug of x86/kernel/kdebugfs.c, use ioremap instead of __va for
    low mem because __va does not work for exact memmap=

    Changes from V4:
    - variable efi_setup in 09/14 is changed to the physical address instead of the virtual address
    because it will be not iounmapped until entering virtual mode, it's too long and could cause
    leak.
    - sparse warnings fixes (Matt):
    Added 2 new patches to addressing sparse warnings:
    01/14: x86-mm-sparse-warning-fix-for-early_memremap.patch
    02/14: efi-use-early_memremap-and-early_memunmap.patch
    - krealloc fixes (Boris)
    - rebase on top of Linus tree + Matt's efi master tree (Boris)
    - a lot of documention/spelling fixes (Boris)
    - share function save_runtime_map in 1st/2nd kernel code (Matt)
    - style and other fixes detail see the patch changelog themselves.

    Boris: I still use the function name efi_reuse_config because it could be not only a problem for
    HP workstation, also because we will later split them to another file so efi_ is acceptable for me.

    The patches stay in kexec-efi-testing branch of below repo for testing:
    https://github.com/daveyoung/linux.git

    Dave Young (14):
    x86/mm: sparse warning fix for early_memremap
    efi: use early_memremap and early_memunmap
    efi: remove unused variables in __map_region
    efi: add a wrapper function efi_map_region_fixed
    efi: reserve boot service fix
    efi: cleanup efi_enter_virtual_mode function
    efi: export more efi table variable to sysfs
    efi: export efi runtime memory mapping to sysfs
    efi: passing kexec necessary efi data via setup_data
    efi: only print saved efi runtime maps instead of all memmap ranges
    for kexec
    x86: add xloadflags bit for efi runtime support on kexec
    x86: export x86 boot_params to sysfs
    x86: reserve setup_data ranges late after parsing memmap cmdline
    x86: kdebugfs do not use __va for getting setup_data virt addr

    Documentation/ABI/testing/sysfs-firmware-efi | 24 ++
    .../ABI/testing/sysfs-firmware-efi-runtime-map | 36 ++
    Documentation/ABI/testing/sysfs-kernel-boot_params | 39 +++
    Documentation/x86/boot.txt | 3 +
    arch/x86/boot/header.S | 9 +-
    arch/x86/include/asm/efi.h | 12 +
    arch/x86/include/asm/io.h | 3 +-
    arch/x86/include/uapi/asm/bootparam.h | 2 +
    arch/x86/kernel/Makefile | 1 +
    arch/x86/kernel/kdebugfs.c | 35 +-
    arch/x86/kernel/ksysfs.c | 339 ++++++++++++++++++
    arch/x86/kernel/setup.c | 7 +-
    arch/x86/mm/ioremap.c | 10 +-
    arch/x86/platform/efi/efi.c | 378 ++++++++++++++++-----
    arch/x86/platform/efi/efi_32.c | 2 +
    arch/x86/platform/efi/efi_64.c | 16 +-
    drivers/firmware/efi/Kconfig | 11 +
    drivers/firmware/efi/Makefile | 1 +
    drivers/firmware/efi/efi.c | 47 ++-
    drivers/firmware/efi/runtime-map.c | 176 ++++++++++
    include/linux/efi.h | 9 +
    21 files changed, 1038 insertions(+), 122 deletions(-)
    create mode 100644 Documentation/ABI/testing/sysfs-firmware-efi
    create mode 100644 Documentation/ABI/testing/sysfs-firmware-efi-runtime-map
    create mode 100644 Documentation/ABI/testing/sysfs-kernel-boot_params
    create mode 100644 arch/x86/kernel/ksysfs.c
    create mode 100644 drivers/firmware/efi/runtime-map.c

    --
    1.8.3.1



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