[PATCH 0/3] kexec: Add support for UKI format kernel #9
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added 3 commits
October 14, 2024 09:21
At present, initrd information is passed through --initrd args, and handled until image load. But for the UKI case, the initrd may be stored implicitly in the .initrd section. It means that initrd is perceived at the probe stage. And there should be a way to carry this information forward to the load stage. In oder to implement that, introducing a global implicit_initrd_fd. Signed-off-by: Pingfan Liu <piliu@redhat.com>
A UKI image is a PE file that consists of several sections, typically including: .text, .data, .linux, .initrd, .cmdline, and others. The kernel image is stored in the .linux section, which is one of the formats currently recognized by kexec-tools. Therefore, the UKI parser can be used to strip away the UKI layer, allowing the other parser to continue the procession of the kernel image. Signed-off-by: Pingfan Liu <piliu@redhat.com>
Signed-off-by: Pingfan Liu <piliu@redhat.com>
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As a UEFI PE format kernel image becomes more popular, there is a need
for kexec to reboot those kinds of images.
After the introduction of the UKI (another PE), at present, there are
three competitive methods to support that goal, but all of them have
pros and cons.1 It seems that none of them can be accepted in the near
future. Therefore, we are resorting to the user space kexec-tools to
parse the UKI format for the time being.
By parsing the UKI, systemd-stub is stepped around and PCM will not affect
the boot up of the second system.
v1 -> v2:
Add include/pe.h in makefile to fix 'make dist'
Rename default_initrd_fd to implicit_initrd_fd