include/xen/balloon.h

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