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migration: move dirty bitmap sync to ram_addr.h

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The dirty memory bitmap is managed by ram_addr.h and copied to
migration_bitmap[] periodically during live migration.

Move the code to sync the bitmap to ram_addr.h where related code lives.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <1417519399-3166-5-git-send-email-stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-12-02 11:23:17 +00:00 • committed by Paolo Bonzini
parent d114875b9a
commit 20015f72bd
2 changed files with 46 additions and 44 deletions
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44
include/exec/ram_addr.h
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@ -218,5 +218,49 @@ static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start,
void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t length,
unsigned client);
static inline
uint64_t cpu_physical_memory_sync_dirty_bitmap(unsigned long *dest,
ram_addr_t start,
ram_addr_t length)
{
ram_addr_t addr;
unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
uint64_t num_dirty = 0;
/* start address is aligned at the start of a word? */
if (((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) {
int k;
int nr = BITS_TO_LONGS(length >> TARGET_PAGE_BITS);
unsigned long *src = ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION];
for (k = page; k < page + nr; k++) {
if (src[k]) {
unsigned long new_dirty;
new_dirty = ~dest[k];
dest[k] |= src[k];
new_dirty &= src[k];
num_dirty += ctpopl(new_dirty);
src[k] = 0;
}
}
} else {
for (addr = 0; addr < length; addr += TARGET_PAGE_SIZE) {
if (cpu_physical_memory_get_dirty(start + addr,
TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
long k = (start + addr) >> TARGET_PAGE_BITS;
if (!test_and_set_bit(k, dest)) {
num_dirty++;
}
cpu_physical_memory_reset_dirty(start + addr,
TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION);
}
}
}
return num_dirty;
}
#endif
#endif