Merge branch 'x86/boot' into x86/mm, to pick up interacting changes

The SME patches we are about to apply add some E820 logic, so merge in
pending E820 code changes first, to have a single code base.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --cc Documentation/admin-guide/kernel-parameters.txt
Simple merge

diff --cc arch/x86/xen/enlighten_pv.c
Simple merge

diff --cc arch/x86/xen/mmu_pv.c
Simple merge

diff --cc drivers/idle/intel_idle.c
Simple merge