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Allow machine to opt in for hostmem backend based initial RAM even if user uses old -mem-path/prealloc options by providing MachineClass::default_ram_id Follow up patches will incrementally convert machines to new API, by dropping memory_region_allocate_system_memory() and setting default_ram_id that board used to use before conversion to keep migration stream the same. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20200219160953.13771-4-imammedo@redhat.com>