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memory: introduce memory_region_test_and_clear_dirty 

This function avoids having to do two calls, one to test the dirty bit, and
other to reset it.

Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2012-10-17 20:24:28 +02:00
parent 5f718a15d0
commit 6c279db8ee
2 changed files with 32 additions and 0 deletions
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16
include/exec/memory.h
View File

@ -453,6 +453,22 @@ bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
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)

16
memory.c
View File

@ -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;