x86/boot/compressed/64: Print error if 5-level paging is not supported
If the machine does not support the paging mode for which the kernel was compiled, the boot process cannot continue. It's not possible to let the kernel detect the mismatch as it does not even reach the point where cpu features can be evaluted due to a triple fault in the KASLR setup. Instead of instantaneous silent reboot, emit an error message which gives the user the information why the boot fails. Fixes: 77ef56e4 ("x86: Enable 5-level paging support via CONFIG_X86_5LEVEL=y") Reported-by: Borislav Petkov <bp@suse.de> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Borislav Petkov <bp@suse.de> Cc: Andi Kleen <ak@linux.intel.com> Cc: stable@vger.kernel.org Cc: Andy Lutomirski <luto@amacapital.net> Cc: linux-mm@kvack.org Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lkml.kernel.org/r/20171204124059.63515-3-kirill.shutemov@linux.intel.com
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