After introducing zboot image, kexec_file can not load and jump to the
new style image. Hence it demands a method to load the new kernel.
The crux of the problem lies in when and how to decompress the Image.gz.
There are three possible courses to take: -1. in user space, but hard to
achieve due to the signature verification inside the kernel. -2. at the
boot time, let the efi_zboot_entry() handles it, which means a simulated
EFI service should be provided to that entry, especially about how to be
aware of the memory layout. -3. in kernel space, during the file load
of the zboot image. At that point, the kernel masters the whole memory
information, and easily allocates a suitable memory for the decompressed
kernel image. (I think this is similar to what grub does today).
The core of this series is [5/6]. [3,6/6] handles the config option.
The assumption of [3/6] is kexec_file_load is independent of zboot,
especially it can load kernel images compressed with different
compression method. [6/6] is if EFI_ZBOOT, the corresponding
decompression method should be included.
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: kexec@xxxxxxxxxxxxxxxxxxx
To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
To: linux-kernel@xxxxxxxxxxxxxxx
Pingfan Liu (6):
arm64: kexec: Rename kexec_image.c to kexec_raw_image.c
lib/decompress: Introduce decompress_method_by_name()
arm64: Kconfig: Pick decompressing method for kexec file load
lib/decompress: Keep decompress routines based on selection
arm64: kexec: Introduce zboot image loader
init/Kconfig: Select decompressing method if compressing kernel
arch/arm64/Kconfig | 59 ++++++
arch/arm64/include/asm/kexec.h | 4 +-
arch/arm64/kernel/Makefile | 2 +-
.../{kexec_image.c => kexec_raw_image.c} | 2 +-
arch/arm64/kernel/kexec_zboot_image.c | 186 ++++++++++++++++++
arch/arm64/kernel/machine_kexec.c | 1 +
arch/arm64/kernel/machine_kexec_file.c | 3 +-
include/linux/decompress/generic.h | 2 +
include/linux/decompress/mm.h | 9 +-
include/linux/zboot.h | 26 +++
init/Kconfig | 7 +
lib/Kconfig | 3 +
lib/decompress.c | 17 +-
13 files changed, 314 insertions(+), 7 deletions(-)
rename arch/arm64/kernel/{kexec_image.c => kexec_raw_image.c} (98%)
create mode 100644 arch/arm64/kernel/kexec_zboot_image.c
create mode 100644 include/linux/zboot.h
--
2.31.1
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