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I am not able to get kexec to work. For x86_64 relocate_kernel fails to store information for jumping back.

Kexec stops in movq %r9, CP_PA_TABLE_PAGE(%r11).


works fine for kernel 4.4.162, doesn't work for 4.19.2


also works with 4.19.16

How can I find out which change caused this error?


It seems it is a config issue, it works also for 4.19.2 however with defconfig. Does someone know what the config option breaks kexec?


I forgot to save/restore scratch registers

Really kexec stops in

/* Switch to the identity mapped page tables */
movq    %r9, %cr3

Any idea? What config parameter is wrong?


Must also mention I had to disable loading of fs and gs in load_segments(), otherwise kexec breaks already in load_segments()

Is it EFI issue?

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