This patchset primarily fixes problems with Arm migration
induced by a bug in the core vmstate handling of subsections:
currently the migration code incorrectly treats a subsection with
no .needed function pointer as if it was the subsection list
terminator -- it is ignored and so is everything after it.

I did an audit of all uses of subsections in QEMU, and found
that we had four which didn't define a .needed function (assuming
that this meant "always needed", same as the semantics for
not providing a .needed function for a toplevel vmsd).
This patchset fixes them all up by providing a dummy needed
function.

It also fixes an error in vmstate_gicv3_cpu which was accidentally
initializing .subsections twice and so ignoring one of the subsections.

Strictly speaking only the first patch is a true regression from 2.12.

Disclaimer: compile tested only as I have to rush out the door in a
moment, but I wanted to get these on-list for review given that
rc4 isn't too far away... I'll test them properly on Monday.

thanks
-- PMM

Peter Maydell (3):
  hw/intc/arm_gicv3_common: Give no-migration-shift-bug subsection a
    needed function
  hw/intc/arm_gicv3_common: Combine duplicate .subsections in
    vmstate_gicv3_cpu
  target/arm: Add dummy needed functions to M profile vmstate
    subsections

 hw/intc/arm_gicv3_common.c | 9 ++++++---
 target/arm/machine.c       | 3 +++
 2 files changed, 9 insertions(+), 3 deletions(-)

-- 
2.17.1