diff options
Diffstat (limited to 'include/exec/ram_addr.h')
| -rw-r--r-- | include/exec/ram_addr.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index db977fbdae..c6736ed04f 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -79,6 +79,37 @@ static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start, xen_modified_memory(start, length); } +static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap, + ram_addr_t start, + ram_addr_t pages) +{ + unsigned int i, j; + unsigned long page_number, c; + hwaddr addr; + ram_addr_t ram_addr; + unsigned int len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS; + unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE; + + /* + * bitmap-traveling is faster than memory-traveling (for addr...) + * especially when most of the memory is not dirty. + */ + for (i = 0; i < len; i++) { + if (bitmap[i] != 0) { + c = leul_to_cpu(bitmap[i]); + do { + j = ffsl(c) - 1; + c &= ~(1ul << j); + page_number = (i * HOST_LONG_BITS + j) * hpratio; + addr = page_number * TARGET_PAGE_SIZE; + ram_addr = start + addr; + cpu_physical_memory_set_dirty_range(ram_addr, + TARGET_PAGE_SIZE * hpratio); + } while (c != 0); + } + } +} + static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start, ram_addr_t length, unsigned client) |