kvm: slot handling fixes (and small cleanups)

Hopefully this is the last bunch of fixes for the cleanup series.

1. log_start() was called before region_add(), which is wrong.
2. I messed up the calculation of the delta when aligning the ram address (maybe we should simply also use ROUND_UP there ...).
3. I think we could get log_start/log_stop/log_sync when we actually haven't registered a slot (due to trapping).
4. Some further cleanups

Available on: https://github.com/davidhildenbrand/qemu/commits/kvm_slot

@Joe, if you could retest, this would be great! I updated the branch.

David Hildenbrand (7):
memory: call log_start after region_add
kvm: fix alignment of ram address
kvm: tolerate non-existing slot for log_start/log_stop/log_sync
kvm: fix error message when failing to unregister slot
kvm: region_add and region_del is not called on updates
kvm: simplify kvm_align_section()
memory: reuse section_from_flat_range()

 accel/kvm/kvm-all.c | 39 ++++++++++++++-------------------------
 memory.c            | 16 +++++-----------
 2 files changed, 19 insertions(+), 36 deletions(-)

2.13.5