diff options
| -rw-r--r-- | include/exec/memory.h | 16 | ||||
| -rw-r--r-- | memory.c | 16 |
2 files changed, 32 insertions, 0 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h index aada969628..2322732dce 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -454,6 +454,22 @@ void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr, hwaddr size); /** + * memory_region_test_and_clear_dirty: Check whether a range of bytes is dirty + * for a specified client. It clears them. + * + * Checks whether a range of bytes has been written to since the last + * call to memory_region_reset_dirty() with the same @client. Dirty logging + * must be enabled. + * + * @mr: the memory region being queried. + * @addr: the address (relative to the start of the region) being queried. + * @size: the size of the range being queried. + * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or + * %DIRTY_MEMORY_VGA. + */ +bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr, + hwaddr size, unsigned client); +/** * memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with * any external TLBs (e.g. kvm) * diff --git a/memory.c b/memory.c index 35e6122dd7..410c5f80b4 100644 --- a/memory.c +++ b/memory.c @@ -1081,6 +1081,22 @@ void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr, return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1); } +bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr, + hwaddr size, unsigned client) +{ + bool ret; + assert(mr->terminates); + ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, + 1 << client); + if (ret) { + cpu_physical_memory_reset_dirty(mr->ram_addr + addr, + mr->ram_addr + addr + size, + 1 << client); + } + return ret; +} + + void memory_region_sync_dirty_bitmap(MemoryRegion *mr) { AddressSpace *as; |