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If the running kernel has 5-level paging activated, the 5-level paging mode
is preserved across kexec. If the kexec'ed kernel does not contain support
for handling active 5-level paging mode in the decompressor, the
decompressor will crash with #GP.
Prevent this situation at load time. If 5-level paging is active, check the
xloadflags whether the kexec kernel can handle 5-level paging at least in
the decompressor. If not, reject the load attempt and print out an error
message.
Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: bp@alien8.de
Cc: hpa@zytor.com
Cc: dyoung@redhat.com
Link: https://lkml.kernel.org/r/20190524073810.24298-3-bhe@redhat.com
ee338b9ee2