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exec: split length -> used_length/max_length

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This patch allows us to distinguish between two
length values for each block:
    max_length - length of memory block that was allocated
    used_length - length of block used by QEMU/guest

Currently, we set used_length - max_length, unconditionally.
Follow-up patches allow used_length <= max_length.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Michael S. Tsirkin
2014-12-15 22:55:32 +02:00
parent c8d6f66ae7
commit 9b8424d573
3 changed files with 40 additions and 34 deletions
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19
arch_init.c
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@@ -522,7 +522,7 @@ static void migration_bitmap_sync(void)
address_space_sync_dirty_bitmap(&address_space_memory);
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
migration_bitmap_sync_range(block->mr->ram_addr, block->length);
migration_bitmap_sync_range(block->mr->ram_addr, block->used_length);
}
trace_migration_bitmap_sync_end(migration_dirty_pages
- num_dirty_pages_init);
@@ -668,7 +668,7 @@ static int ram_find_and_save_block(QEMUFile *f, bool last_stage)
offset >= last_offset) {
break;
}
if (offset >= block->length) {
if (offset >= block->used_length) {
offset = 0;
block = QTAILQ_NEXT(block, next);
if (!block) {
@@ -727,7 +727,7 @@ uint64_t ram_bytes_total(void)
uint64_t total = 0;
QTAILQ_FOREACH(block, &ram_list.blocks, next)
total += block->length;
total += block->used_length;
return total;
}
@@ -831,7 +831,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
uint64_t block_pages;
block_pages = block->length >> TARGET_PAGE_BITS;
block_pages = block->used_length >> TARGET_PAGE_BITS;
migration_dirty_pages += block_pages;
}
@@ -844,7 +844,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
qemu_put_byte(f, strlen(block->idstr));
qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
qemu_put_be64(f, block->length);
qemu_put_be64(f, block->used_length);
}
qemu_mutex_unlock_ramlist();
@@ -1015,7 +1015,7 @@ static inline void *host_from_stream_offset(QEMUFile *f,
uint8_t len;
if (flags & RAM_SAVE_FLAG_CONTINUE) {
if (!block || block->length <= offset) {
if (!block || block->max_length <= offset) {
error_report("Ack, bad migration stream!");
return NULL;
}
@@ -1028,7 +1028,8 @@ static inline void *host_from_stream_offset(QEMUFile *f,
id[len] = 0;
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
if (!strncmp(id, block->idstr, sizeof(id)) && block->length > offset) {
if (!strncmp(id, block->idstr, sizeof(id)) &&
block->max_length > offset) {
return memory_region_get_ram_ptr(block->mr) + offset;
}
}
@@ -1085,10 +1086,10 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
if (!strncmp(id, block->idstr, sizeof(id))) {
if (block->length != length) {
if (block->used_length != length) {
error_report("Length mismatch: %s: 0x" RAM_ADDR_FMT
" in != 0x" RAM_ADDR_FMT, id, length,
block->length);
block->used_length);
ret = -EINVAL;
}
break;