1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /****************************************************************************** 3 * Xen balloon functionality 4 */ 5 6 #define RETRY_UNLIMITED 0 7 8 struct balloon_stats { 9 /* We aim for 'current allocation' == 'target allocation'. */ 10 unsigned long current_pages; 11 unsigned long target_pages; 12 unsigned long target_unpopulated; 13 /* Number of pages in high- and low-memory balloons. */ 14 unsigned long balloon_low; 15 unsigned long balloon_high; 16 unsigned long total_pages; 17 unsigned long schedule_delay; 18 unsigned long max_schedule_delay; 19 unsigned long retry_count; 20 unsigned long max_retry_count; 21 }; 22 23 extern struct balloon_stats balloon_stats; 24 25 void balloon_set_new_target(unsigned long target); 26 27 int alloc_xenballooned_pages(int nr_pages, struct page **pages); 28 void free_xenballooned_pages(int nr_pages, struct page **pages); 29 30 struct device; 31 #ifdef CONFIG_XEN_SELFBALLOONING 32 extern int register_xen_selfballooning(struct device *dev); 33 #else 34 static inline int register_xen_selfballooning(struct device *dev) 35 { 36 return -ENOSYS; 37 } 38 #endif 39 40 #ifdef CONFIG_XEN_BALLOON 41 void xen_balloon_init(void); 42 #else 43 static inline void xen_balloon_init(void) 44 { 45 } 46 #endif 47 48 #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG 49 struct resource; 50 void arch_xen_balloon_init(struct resource *hostmem_resource); 51 #endif 52