1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*
* QEMU Hyper-V Dynamic Memory Protocol driver
*
* Copyright (C) 2020-2023 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "hv-balloon-internal.h"
#include "hv-balloon-our_range_memslots.h"
#include "trace.h"
/* OurRange */
static void our_range_init(OurRange *our_range, uint64_t start, uint64_t count)
{
assert(count <= UINT64_MAX - start);
our_range->range.start = start;
our_range->range.count = count;
hvb_page_range_tree_init(&our_range->removed_guest);
hvb_page_range_tree_init(&our_range->removed_both);
/* mark the whole range as unused but for potential use */
our_range->added = 0;
our_range->unusable_tail = 0;
}
static void our_range_destroy(OurRange *our_range)
{
hvb_page_range_tree_destroy(&our_range->removed_guest);
hvb_page_range_tree_destroy(&our_range->removed_both);
}
void hvb_our_range_clear_removed_trees(OurRange *our_range)
{
hvb_page_range_tree_destroy(&our_range->removed_guest);
hvb_page_range_tree_destroy(&our_range->removed_both);
hvb_page_range_tree_init(&our_range->removed_guest);
hvb_page_range_tree_init(&our_range->removed_both);
}
void hvb_our_range_mark_added(OurRange *our_range, uint64_t additional_size)
{
assert(additional_size <= UINT64_MAX - our_range->added);
our_range->added += additional_size;
assert(our_range->added <= UINT64_MAX - our_range->unusable_tail);
assert(our_range->added + our_range->unusable_tail <=
our_range->range.count);
}
/* OurRangeMemslots */
static void our_range_memslots_init_slots(OurRangeMemslots *our_range,
MemoryRegion *backing_mr,
Object *memslot_owner)
{
OurRangeMemslotsSlots *memslots = &our_range->slots;
unsigned int idx;
uint64_t memslot_offset;
assert(memslots->count > 0);
memslots->slots = g_new0(MemoryRegion, memslots->count);
/* Initialize our memslots, but don't map them yet. */
assert(memslots->size_each > 0);
for (idx = 0, memslot_offset = 0; idx < memslots->count;
idx++, memslot_offset += memslots->size_each) {
uint64_t memslot_size;
g_autofree char *name = NULL;
/* The size of the last memslot might be smaller. */
if (idx == memslots->count - 1) {
uint64_t region_size;
assert(our_range->mr);
region_size = memory_region_size(our_range->mr);
memslot_size = region_size - memslot_offset;
} else {
memslot_size = memslots->size_each;
}
name = g_strdup_printf("memslot-%u", idx);
memory_region_init_alias(&memslots->slots[idx], memslot_owner, name,
backing_mr, memslot_offset, memslot_size);
/*
* We want to be able to atomically and efficiently activate/deactivate
* individual memslots without affecting adjacent memslots in memory
* notifiers.
*/
memory_region_set_unmergeable(&memslots->slots[idx], true);
}
memslots->mapped_count = 0;
}
OurRangeMemslots *hvb_our_range_memslots_new(uint64_t addr,
MemoryRegion *parent_mr,
MemoryRegion *backing_mr,
Object *memslot_owner,
unsigned int memslot_count,
uint64_t memslot_size)
{
OurRangeMemslots *our_range;
our_range = g_malloc(sizeof(*our_range));
our_range_init(&our_range->range,
addr / HV_BALLOON_PAGE_SIZE,
memory_region_size(parent_mr) / HV_BALLOON_PAGE_SIZE);
our_range->slots.size_each = memslot_size;
our_range->slots.count = memslot_count;
our_range->mr = parent_mr;
our_range_memslots_init_slots(our_range, backing_mr, memslot_owner);
return our_range;
}
static void our_range_memslots_free_memslots(OurRangeMemslots *our_range)
{
OurRangeMemslotsSlots *memslots = &our_range->slots;
unsigned int idx;
uint64_t offset;
memory_region_transaction_begin();
for (idx = 0, offset = 0; idx < memslots->mapped_count;
idx++, offset += memslots->size_each) {
trace_hv_balloon_unmap_slot(idx, memslots->count, offset);
assert(memory_region_is_mapped(&memslots->slots[idx]));
memory_region_del_subregion(our_range->mr, &memslots->slots[idx]);
}
memory_region_transaction_commit();
for (idx = 0; idx < memslots->count; idx++) {
object_unparent(OBJECT(&memslots->slots[idx]));
}
g_clear_pointer(&our_range->slots.slots, g_free);
}
void hvb_our_range_memslots_free(OurRangeMemslots *our_range)
{
OurRangeMemslotsSlots *memslots = &our_range->slots;
MemoryRegion *hostmem_mr;
RAMBlock *rb;
assert(our_range->slots.count > 0);
assert(our_range->slots.slots);
hostmem_mr = memslots->slots[0].alias;
rb = hostmem_mr->ram_block;
ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb));
our_range_memslots_free_memslots(our_range);
our_range_destroy(&our_range->range);
g_free(our_range);
}
void hvb_our_range_memslots_ensure_mapped_additional(OurRangeMemslots *our_range,
uint64_t additional_map_size)
{
OurRangeMemslotsSlots *memslots = &our_range->slots;
uint64_t total_map_size;
unsigned int idx;
uint64_t offset;
total_map_size = (our_range->range.added + additional_map_size) *
HV_BALLOON_PAGE_SIZE;
idx = memslots->mapped_count;
assert(memslots->size_each > 0);
offset = idx * memslots->size_each;
/*
* Activate all memslots covered by the newly added region in a single
* transaction.
*/
memory_region_transaction_begin();
for ( ; idx < memslots->count;
idx++, offset += memslots->size_each) {
/*
* If this memslot starts beyond or at the end of the range to map so
* does every next one.
*/
if (offset >= total_map_size) {
break;
}
/*
* Instead of enabling/disabling memslot, we add/remove them. This
* should make address space updates faster, because we don't have to
* loop over many disabled subregions.
*/
trace_hv_balloon_map_slot(idx, memslots->count, offset);
assert(!memory_region_is_mapped(&memslots->slots[idx]));
memory_region_add_subregion(our_range->mr, offset,
&memslots->slots[idx]);
memslots->mapped_count++;
}
memory_region_transaction_commit();
}
|
