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1 /*
2 * QEMU Hyper-V Dynamic Memory Protocol driver
3 *
4 * Copyright (C) 2020-2023 Oracle and/or its affiliates.
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 */
9
10 #ifndef HW_HYPERV_HV_BALLOON_OUR_RANGE_MEMSLOTS_H
11 #define HW_HYPERV_HV_BALLOON_OUR_RANGE_MEMSLOTS_H
12
13
14 #include "system/memory.h"
15 #include "qom/object.h"
16 #include "hv-balloon-page_range_tree.h"
17
18 /* OurRange */
19 #define OUR_RANGE(ptr) ((OurRange *)(ptr))
20
21 /* "our range" means the memory range owned by this driver (for hot-adding) */
22 typedef struct OurRange {
23 PageRange range;
24
25 /* How many pages were hot-added to the guest */
26 uint64_t added;
27
28 /* Pages at the end not currently usable */
29 uint64_t unusable_tail;
30
31 /* Memory removed from the guest */
32 PageRangeTree removed_guest, removed_both;
33 } OurRange;
34
35 static inline uint64_t our_range_get_remaining_start(OurRange *our_range)
36 {
37 return our_range->range.start + our_range->added;
38 }
39
40 static inline uint64_t our_range_get_remaining_size(OurRange *our_range)
41 {
42 return our_range->range.count - our_range->added - our_range->unusable_tail;
43 }
44
45 void hvb_our_range_mark_added(OurRange *our_range, uint64_t additional_size);
46
47 static inline void our_range_mark_remaining_unusable(OurRange *our_range)
48 {
49 our_range->unusable_tail = our_range->range.count - our_range->added;
50 }
51
52 static inline PageRangeTree our_range_get_removed_tree(OurRange *our_range,
53 bool both)
54 {
55 if (both) {
56 return our_range->removed_both;
57 } else {
58 return our_range->removed_guest;
59 }
60 }
61
62 static inline bool our_range_is_removed_tree_empty(OurRange *our_range,
63 bool both)
64 {
65 if (both) {
66 return page_range_tree_is_empty(our_range->removed_both);
67 } else {
68 return page_range_tree_is_empty(our_range->removed_guest);
69 }
70 }
71
72 void hvb_our_range_clear_removed_trees(OurRange *our_range);
73
74 /* OurRangeMemslots */
75 typedef struct OurRangeMemslotsSlots {
76 /* Nominal size of each memslot (the last one might be smaller) */
77 uint64_t size_each;
78
79 /* Slots array and its element count */
80 MemoryRegion *slots;
81 unsigned int count;
82
83 /* How many slots are currently mapped */
84 unsigned int mapped_count;
85 } OurRangeMemslotsSlots;
86
87 typedef struct OurRangeMemslots {
88 OurRange range;
89
90 /* Memslots covering our range */
91 OurRangeMemslotsSlots slots;
92
93 MemoryRegion *mr;
94 } OurRangeMemslots;
95
96 OurRangeMemslots *hvb_our_range_memslots_new(uint64_t addr,
97 MemoryRegion *parent_mr,
98 MemoryRegion *backing_mr,
99 Object *memslot_owner,
100 unsigned int memslot_count,
101 uint64_t memslot_size);
102 void hvb_our_range_memslots_free(OurRangeMemslots *our_range);
103
104 G_DEFINE_AUTOPTR_CLEANUP_FUNC(OurRangeMemslots, hvb_our_range_memslots_free)
105
106 void hvb_our_range_memslots_ensure_mapped_additional(OurRangeMemslots *our_range,
107 uint64_t additional_map_size);
108
109 #endif