From patchwork Tue Dec 11 12:47:02 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [26/35] memory: introduce memory_region_test_and_clear_dirty Date: Tue, 11 Dec 2012 02:47:02 -0000 From: Juan Quintela X-Patchwork-Id: 205217 Message-Id: <1355230031-28233-27-git-send-email-quintela@redhat.com> To: qemu-devel@nongnu.org This function avoids having to do two calls, one to test the dirty bit, and other to reset it. Signed-off-by: Juan Quintela --- memory.c | 16 ++++++++++++++++ memory.h | 16 ++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/memory.c b/memory.c index 7419853..c72a5e2 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; diff --git a/memory.h b/memory.h index 9462bfd..bc63a87 100644 --- a/memory.h +++ b/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) *