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Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

virtio_balloon.h (6071B)


  1. #ifndef _LINUX_VIRTIO_BALLOON_H
  2. #define _LINUX_VIRTIO_BALLOON_H
  3. /* This header is BSD licensed so anyone can use the definitions to implement
  4. * compatible drivers/servers.
  5. *
  6. * Redistribution and use in source and binary forms, with or without
  7. * modification, are permitted provided that the following conditions
  8. * are met:
  9. * 1. Redistributions of source code must retain the above copyright
  10. * notice, this list of conditions and the following disclaimer.
  11. * 2. Redistributions in binary form must reproduce the above copyright
  12. * notice, this list of conditions and the following disclaimer in the
  13. * documentation and/or other materials provided with the distribution.
  14. * 3. Neither the name of IBM nor the names of its contributors
  15. * may be used to endorse or promote products derived from this software
  16. * without specific prior written permission.
  17. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
  18. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20. * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
  21. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27. * SUCH DAMAGE. */
  28. #include <linux/types.h>
  29. #include <linux/virtio_types.h>
  30. #include <linux/virtio_ids.h>
  31. #include <linux/virtio_config.h>
  32. /* The feature bitmap for virtio balloon */
  33. #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
  34. #define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
  35. #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */
  36. #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */
  37. #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */
  38. #define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */
  39. /* Size of a PFN in the balloon interface. */
  40. #define VIRTIO_BALLOON_PFN_SHIFT 12
  41. #define VIRTIO_BALLOON_CMD_ID_STOP 0
  42. #define VIRTIO_BALLOON_CMD_ID_DONE 1
  43. struct virtio_balloon_config {
  44. /* Number of pages host wants Guest to give up. */
  45. __le32 num_pages;
  46. /* Number of pages we've actually got in balloon. */
  47. __le32 actual;
  48. /*
  49. * Free page hint command id, readonly by guest.
  50. * Was previously named free_page_report_cmd_id so we
  51. * need to carry that name for legacy support.
  52. */
  53. union {
  54. __le32 free_page_hint_cmd_id;
  55. __le32 free_page_report_cmd_id; /* deprecated */
  56. };
  57. /* Stores PAGE_POISON if page poisoning is in use */
  58. __le32 poison_val;
  59. };
  60. #define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
  61. #define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */
  62. #define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */
  63. #define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */
  64. #define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
  65. #define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
  66. #define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */
  67. #define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
  68. #define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */
  69. #define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */
  70. #define VIRTIO_BALLOON_S_OOM_KILL 10 /* OOM killer invocations */
  71. #define VIRTIO_BALLOON_S_ALLOC_STALL 11 /* Stall count of memory allocatoin */
  72. #define VIRTIO_BALLOON_S_ASYNC_SCAN 12 /* Amount of memory scanned asynchronously */
  73. #define VIRTIO_BALLOON_S_DIRECT_SCAN 13 /* Amount of memory scanned directly */
  74. #define VIRTIO_BALLOON_S_ASYNC_RECLAIM 14 /* Amount of memory reclaimed asynchronously */
  75. #define VIRTIO_BALLOON_S_DIRECT_RECLAIM 15 /* Amount of memory reclaimed directly */
  76. #define VIRTIO_BALLOON_S_NR 16
  77. #define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
  78. VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
  79. VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \
  80. VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \
  81. VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \
  82. VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \
  83. VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \
  84. VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \
  85. VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
  86. VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
  87. VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures", \
  88. VIRTIO_BALLOON_S_NAMES_prefix "oom-kills", \
  89. VIRTIO_BALLOON_S_NAMES_prefix "alloc-stalls", \
  90. VIRTIO_BALLOON_S_NAMES_prefix "async-scans", \
  91. VIRTIO_BALLOON_S_NAMES_prefix "direct-scans", \
  92. VIRTIO_BALLOON_S_NAMES_prefix "async-reclaims", \
  93. VIRTIO_BALLOON_S_NAMES_prefix "direct-reclaims" \
  94. }
  95. #define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")
  96. /*
  97. * Memory statistics structure.
  98. * Driver fills an array of these structures and passes to device.
  99. *
  100. * NOTE: fields are laid out in a way that would make compiler add padding
  101. * between and after fields, so we have to use compiler-specific attributes to
  102. * pack it, to disable this padding. This also often causes compiler to
  103. * generate suboptimal code.
  104. *
  105. * We maintain this statistics structure format for backwards compatibility,
  106. * but don't follow this example.
  107. *
  108. * If implementing a similar structure, do something like the below instead:
  109. * struct virtio_balloon_stat {
  110. * __virtio16 tag;
  111. * __u8 reserved[6];
  112. * __virtio64 val;
  113. * };
  114. *
  115. * In other words, add explicit reserved fields to align field and
  116. * structure boundaries at field size, avoiding compiler padding
  117. * without the packed attribute.
  118. */
  119. struct virtio_balloon_stat {
  120. __virtio16 tag;
  121. __virtio64 val;
  122. } __attribute__((packed));
  123. #endif /* _LINUX_VIRTIO_BALLOON_H */