Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx> --- v5: document that KEXEC_LOAD may be disabled v6: document that fallback happens in case the kernel does not understand the image --- kexec/kexec.8 | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/kexec/kexec.8 b/kexec/kexec.8 index e0131b4ea827..fb8a4c9caa45 100644 --- a/kexec/kexec.8 +++ b/kexec/kexec.8 @@ -144,6 +144,26 @@ Load the new kernel for use on panic. Specify that the new kernel is of this .I type. .TP +.BI \-s\ (\-\-kexec-file-syscall) +Specify that the new KEXEC_FILE_LOAD syscall should be used exclusively. +.TP +.BI \-c\ (\-\-kexec-syscall) +Specify that the old KEXEC_LOAD syscall should be used exclusively (the default). +.TP +.BI \-a\ (\-\-kexec-syscall-auto) +Try the new KEXEC_FILE_LOAD syscall first and when it is not supported or the +kernel does not understand the supplied image fall back to the old KEXEC_LOAD +interface. + +There is no one single interface that always works. + +KEXEC_FILE_LOAD is required on systems that use locked-down secure boot to +verify the kernel signature. KEXEC_LOAD may be also disabled in the kernel +configuration. + +KEXEC_LOAD is required for some kernel image formats and on architectures that +do not implement KEXEC_FILE_LOAD. +.TP .B \-u\ (\-\-unload) Unload the current .B kexec -- 2.13.6 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
