xref: /linux/include/xen/balloon.h (revision 3bdab16c55f57a24245c97d707241dd9b48d1a91)
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