drivers/hv/hv_balloon.c

201  * if the host has accepted the version sent by the guest.
203  * is_accepted: If TRUE, host has accepted the version and the guest
230  * guest. This message notifies if the host has accepted the guest's
231  * capabilities. If the host has not accepted, the guest must shutdown
234  * is_accepted: Indicates if the host has accepted guest's capabilities.
363  * the guest has hit an upper physical memory barrier.
426  * that the host has asked us to hot add. The range
535 	 * This state tracks if the host has specified a hot-add
592 static inline bool has_pfn_is_backed(struct hv_hotadd_state *has,
598 	if ((pfn < has->covered_start_pfn) || (pfn >= has->covered_end_pfn))
602 	list_for_each_entry(gap, &has->gap_list, list) {
614 	struct hv_hotadd_state *has;
623 		list_for_each_entry(has, &dm_device.ha_region_list, list) {
624 			while ((pfn >= has->start_pfn) &&
625 			       (pfn < has->end_pfn) &&
628 				if (has_pfn_is_backed(has, pfn))
690 static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg)
692 	if (!has_pfn_is_backed(has, page_to_pfn(pg))) {
707 static void hv_bring_pgs_online(struct hv_hotadd_state *has,
714 		hv_page_online_one(has, pfn_to_page(start_pfn + i));
719 				struct hv_hotadd_state *has)
731 			has->ha_end_pfn +=  HA_CHUNK;
741 			has->covered_end_pfn +=  processed_pfn;
763 				has->ha_end_pfn -= HA_CHUNK;
764 				has->covered_end_pfn -=  processed_pfn;
784 	struct hv_hotadd_state *has;
788 	list_for_each_entry(has, &dm_device.ha_region_list, list) {
790 		if ((pfn < has->start_pfn) ||
791 				(pfn + (1UL << order) > has->end_pfn))
794 		hv_bring_pgs_online(has, pfn, 1UL << order);
801 	struct hv_hotadd_state *has;
807 	list_for_each_entry(has, &dm_device.ha_region_list, list) {
812 		if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn)
819 		if (has->covered_end_pfn != start_pfn) {
827 			gap->start_pfn = has->covered_end_pfn;
829 			list_add_tail(&gap->list, &has->gap_list);
831 			has->covered_end_pfn = start_pfn;
838 		if ((start_pfn + pfn_cnt) > has->end_pfn) {
839 			residual = (start_pfn + pfn_cnt - has->end_pfn);
847 			has->end_pfn += new_inc;
863 	struct hv_hotadd_state *has;
872 	list_for_each_entry(has, &dm_device.ha_region_list, list) {
877 		if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn)
880 		old_covered_state = has->covered_end_pfn;
882 		if (start_pfn < has->ha_end_pfn) {
888 			pgs_ol = has->ha_end_pfn - start_pfn;
892 			has->covered_end_pfn +=  pgs_ol;
902 			if (start_pfn > has->start_pfn &&
904 				hv_bring_pgs_online(has, start_pfn, pgs_ol);
908 		if ((has->ha_end_pfn < has->end_pfn) && (pfn_cnt > 0)) {
916 			size = (has->end_pfn - has->ha_end_pfn);
925 			hv_mem_hot_add(has->ha_end_pfn, size, pfn_cnt, has);
932 		res = has->covered_end_pfn - old_covered_state;
961 	 * If the host has specified a hot-add range; deal with it first.
1018 		 * The host has not specified the hot-add region.
1041 	 * The result field of the response structure has the
1203 	 * If the last post time that we sampled has changed,
2044 	struct hv_hotadd_state *has, *tmp;
2059 	 * call has failed and some cleanup has been done as
2072 	list_for_each_entry_safe(has, tmp, &dm->ha_region_list, list) {
2073 		list_for_each_entry_safe(gap, tmp_gap, &has->gap_list, list) {
2077 		list_del(&has->list);
2078 		kfree(has);