118 		 * limitations on hot-add, the guest can specify
340  * Hot add request message. Message sent from the host to the guest.
342  * mem_range: Memory range to hot add.
344  * On Linux we currently don't support this since we cannot hot add
354  * Hot add response message.
355  * This message is sent by the guest to report the status of a hot add request.
357  * assume all further hot add requests will fail, since this indicates that
360  * Hot adds may also fail due to low resources; in this case, the guest must
361  * not complete this message until the hot add can succeed, and the host must
362  * not send a new hot add request until the response is sent.
363  * If VSC fails to hot add memory DYNMEM_NUMBER_OF_UNSUCCESSFUL_HOTADD_ATTEMPTS
367  * page_count: number of pages that were successfully hot added.
419  * State to manage hot adding memory into the guest.
421  * that the host has asked us to hot add. The range
423  * currently hot added. We hot add in multiples of 128M
520 	 * State to execute the "hot-add" operation.
525 	 * This state tracks if the host has specified a hot-add
531 	 * State to synchronize hot-add.
536 	 * This thread handles hot-add
550 	 * A list of hot-add regions.
743 				 * precludes hot adding memory. Stop all further  in hv_mem_hot_add()
744 				 * memory hot-add.  in hv_mem_hot_add()
757 		 * is done outside of kernel (memhp_auto_online). Since the hot  in hv_mem_hot_add()
759 		 * the hot added region have not been "onlined" within the  in hv_mem_hot_add()
800 		 * "hot add block", move on.  in pfn_covered()
825 		 * If the current hot add-request extends beyond  in pfn_covered()
859 	pr_debug("Hot adding %lu pages starting at pfn 0x%lx.\n", pg_count,  in handle_pg_range()
866 		 * "hot add block", move on.  in handle_pg_range()
876 			 * in an already hot added region. Bring  in handle_pg_range()
901 			 * We have some residual hot add range  in handle_pg_range()
902 			 * that needs to be hot added; hot add  in handle_pg_range()
903 			 * it now. Hot add a multiple of  in handle_pg_range()
953 	 * If the host has specified a hot-add range; deal with it first.  in process_hot_add()
1010 		 * The host has not specified the hot-add region.  in hot_add_req()
1011 		 * Based on the hot-add page range being specified,  in hot_add_req()
1012 		 * compute a hot-add region that can cover the pages  in hot_add_req()
1013 		 * that need to be hot-added while ensuring the alignment  in hot_add_req()
1014 		 * and size requirements of Linux as it relates to hot-add.  in hot_add_req()
1037 	 * 1. If all or some pages hot-added: Guest should return success.  in hot_add_req()
1039 	 * 2. If no pages could be hot-added:  in hot_add_req()
1042 	 * will not attempt any further hot-add operations. This  in hot_add_req()
1047 	 * hot-add operation after some delay.  in hot_add_req()
1057 		pr_err("Memory hot add failed\n");  in hot_add_req()
1528 				pr_warn("Currently hot-adding\n");  in balloon_onchannelcallback()
1533 				 * This is a normal hot-add request specifying  in balloon_onchannelcallback()
1534 				 * hot-add memory.  in balloon_onchannelcallback()
1542 				 * Host is specifying that we first hot-add  in balloon_onchannelcallback()
1631 	 * memory hot-add. Specify 128MB alignment.  in balloon_connect_vsp()