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memory: Add global-locking property to memory regions
This introduces the memory region property "global_locking". It is true by default. By setting it to false, a device model can request BQL-free dispatching of region accesses to its r/w handlers. The actual BQL break-up will be provided in a separate patch. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Frederic Konrad <fred.konrad@greensocs.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1434646046-27150-4-git-send-email-pbonzini@redhat.com>
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