memory: Use transaction_begin/commit also for single-step operations
Wrap also simple operations consisting only of a single step with memory_region_transaction_begin/commit. This allows to perform additional steps like coalesced MMIO flushing from a single place. This requires dropping some micro-optimizations: The skipping of topology updates after updating disabled or unregistered regions. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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