[PATCH 5/6] qemu-kvm: Use cpu_physical_memory_set_dirty_range() to update phys_ram_dirty.

Yoshiaki Tamura
2010-03-16T10:56:21Z

Modifies kvm_get_dirty_pages_log_range to use
cpu_physical_memory_set_dirty_range() to update the row of
the bit-based phys_ram_dirty bitmap at once.

Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp>
Signed-off-by: OHMURA Kei <ohmura.kei@lab.ntt.co.jp>
---
qemu-kvm.c | 19 ++++++-------------
1 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/qemu-kvm.c b/qemu-kvm.c
index e417f21..75fa9b0 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -2305,9 +2305,8 @@ static int kvm_get_dirty_pages_log_range(unsigned long start_addr,
unsigned long offset,
unsigned long mem_size)
{
- unsigned int i, j;
- unsigned long page_number, addr, addr1, c;
- ram_addr_t ram_addr;
+ unsigned int i;
+ unsigned long page_number, addr, addr1;
unsigned int len = ((mem_size / TARGET_PAGE_SIZE) + HOST_LONG_BITS - 1) /
HOST_LONG_BITS;

@@ -2317,16 +2316,10 @@ static int kvm_get_dirty_pages_log_range(unsigned long start_addr,
*/
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;
- addr1 = page_number * TARGET_PAGE_SIZE;
- addr = offset + addr1;
- ram_addr = cpu_get_physical_page_desc(addr);
- cpu_physical_memory_set_dirty(ram_addr);
- } while (c != 0);
+ page_number = i * HOST_LONG_BITS;
+ addr1 = page_number * TARGET_PAGE_SIZE;
+ addr = offset + addr1;
+ cpu_physical_memory_set_dirty_range(addr, leul_to_cpu(bitmap[i]));
}
}
return 0;
--
1.7.0.31.g1df487