drivers/virtio/virtio_mem.c

49  *   Subblocks within a Linux memory block might either be plugged or unplugged.
68 	/* Unplugged, not added to Linux. Can be reused later. */
91 	/* Unplugged, not added to Linux. Can be reused later. */
175 			 * plugged" are completely unplugged and can be offlined
230 	 * plugged/unplugged.
526  * Mark all selected subblocks unplugged.
557  * Test if all selected subblocks are unplugged.
571  * Find the first unplugged subblock. Returns vm->sbm.sbs_per_mb in case there is
782  * unplugged. Can be called on online and offline memory blocks.
792 	 * Once all subblocks of a memory block were unplugged, offline and  in virtio_mem_sbm_try_remove_unplugged_mb()
1128 		 * When restarting the VM, all memory is unplugged. Don't  in virtio_mem_pm_notifier_cb()
1308 	 * unplugged subblocks within such a page, we have to process in  in virtio_mem_online_page()
1325 				/* Fully unplugged. */  in virtio_mem_online_page()
1581  * memory block. Will fail if any subblock cannot get unplugged (instead of
1586  * Note: can fail after some subblocks were unplugged.
1625  * Note: can fail after some subblocks were unplugged.
1929  * Will fail if any subblock cannot get unplugged (instead of skipping it).
1934  * Note: Can fail after some subblocks were successfully unplugged.
1944 	/* some subblocks might have been unplugged even on failure */  in virtio_mem_sbm_unplug_any_sb_offline()
1955 		 * unplugged. Temporarily drop the mutex, so  in virtio_mem_sbm_unplug_any_sb_offline()
2019  * Note: Can fail after some subblocks were successfully unplugged. Can
2020  *       return 0 even if subblocks were busy and could not get unplugged.
2035 			goto unplugged;  in virtio_mem_sbm_unplug_any_sb_online()
2057 unplugged:  in virtio_mem_sbm_unplug_any_sb_online()
2069  * unplugged.
2074  * Note: Can fail after some subblocks were successfully unplugged. Can
2075  *       return 0 even if subblocks were busy and could not get unplugged.
2151  * with -EBUSY if some memory is busy and cannot get unplugged.
2312  * Try to unplug all blocks that couldn't be unplugged before, for example,
2345 	 * Let's retry (offlining and) removing completely unplugged Linux  in virtio_mem_cleanup_pending_mb()
2458 	 * Keep retrying to offline and remove completely unplugged Linux  in virtio_mem_run_wq()