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This series is mainly for testing live migration between 2 vdpa_sim_blk devices. The first patch is preparation and moves the buffer allocation into devices, the second patch adds the `shared_buffer_mutex` parameter to vdpa_sim_blk to use the same ramdisk for all devices. Tested with QEMU v8.0.0-rc2 in this way: modprobe vhost_vdpa modprobe vdpa_sim_blk shared_backend=true vdpa dev add mgmtdev

Live migration of vdpa would typically require re-instate vdpa device with an idential set of configs on the destination node, same way as how source node created the device in the first place. In order to allow live migration orchestration software to export the initial set of vdpa attributes with which the device was created, it will be useful if the vdpa tool can report the config on demand

Hi, The text column for '->' becomes '<-' in the data frame returned by getParseData(): > getParseData(parse(text='1->x')) line1 col1 line2 col2 id parent token terminal text 7 1 1 1 4 7 0 expr FALSE 1 1 1 1 1 1 2 NUM_CONST TRUE 1 2 1 1 1 1 2 7 expr FALSE 3