1/* SPDX-License-Identifier: GPL-2.0 */
2/******************************************************************************
3 * Xen balloon functionality
4 */
5
6#define RETRY_UNLIMITED 0
7
8struct 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
23extern struct balloon_stats balloon_stats;
24
25void balloon_set_new_target(unsigned long target);
26
27int alloc_xenballooned_pages(int nr_pages, struct page **pages);
28void free_xenballooned_pages(int nr_pages, struct page **pages);
29
30struct device;
31#ifdef CONFIG_XEN_SELFBALLOONING
32extern int register_xen_selfballooning(struct device *dev);
33#else
34static inline int register_xen_selfballooning(struct device *dev)
35{
36 return -ENOSYS;
37}
38#endif
39
40#ifdef CONFIG_XEN_BALLOON
41void xen_balloon_init(void);
42#else
43static inline void xen_balloon_init(void)
44{
45}
46#endif
47