Merge branch 'exec_rw_const_v4' of https://github.com/philmd/qemu into HEAD

diff --cc accel/kvm/kvm-all.c
Simple merge

diff --cc exec.c
Simple merge

diff --cc hw/ppc/spapr_hcall.c
Simple merge

diff --cc qtest.c
Simple merge

diff --cc target/i386/whpx-all.c
Simple merge