kaiser: enhanced by kernel and user PCIDs

kaiser: enhanced by kernel and user PCIDs

Merged performance improvements to Kaiser, using distinct kernel
and user Process Context Identifiers to minimize the TLB flushing.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit eb82151d0b1df53d1ad8d060ecd554ca12eb552a)
Orabug: 27333760
CVE: CVE-2017-5754
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Conflicts:
	arch/x86/entry/entry_64.S (not in this tree)
	arch/x86/kernel/entry_64.S (patched instead of that)
	arch/x86/entry/entry_64_compat.S (not in this tree)
	arch/x86/ia32/ia32entry.S (patched instead of that)
	arch/x86/include/asm/tlbflush.h

Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>