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On AMD SME machines, makedumpfile tools need to know whether the crashed
kernel was encrypted.

If SME is enabled in the first kernel, the crashed kernel's page table
entries (pgd/pud/pmd/pte) contain the memory encryption mask which
makedumpfile needs to remove in order to obtain the true physical
address.

Export that mask in a vmcoreinfo variable.

 [ bp: Massage commit message and move define at the end of the
   function. ]
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: anderson@redhat.com
Cc: k-hagio@ab.jp.nec.com
Cc: kexec@lists.infradead.org
Cc: linux-doc@vger.kernel.org
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190110121944.6050-3-lijiang@redhat.com