The e1000 driver calls memory_region_add_coalescing but
kvm_coalesce_mmio_region is never called for those regions.  The bug
dates back to the introduction of the memory region API; to fix it,
the last patch deletes and re-adds coalesced MMIO ranges when building
the FlatViews.  The first two patches are preparatory changes.

Paolo Bonzini (3):
  memory: extract flat_range_coalesced_io_{del,add}
  memory: avoid unnecessary coalesced_io_del operations
  memory: update coalesced_range on transaction_commit

 memory.c | 78 ++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 53 insertions(+), 25 deletions(-)

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2.19.1