It checks the first row and puts dirty addr in the array. If the
first row is empty, it skips to the first non-dirty row or the end
addr, and put the length in the first entry of the array.
Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
Signed-off-by: OHMURA Kei <ohmura.kei@xxxxxxxxxxxxx>
---
cpu-all.h | 4 +++
exec.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/cpu-all.h b/cpu-all.h
index 3f8762d..27187d4 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -1007,6 +1007,10 @@ static inline void cpu_physical_memory_mask_dirty_range(ram_addr_t start,
}
}
+int cpu_physical_memory_get_dirty_range(ram_addr_t start, ram_addr_t end,
+ ram_addr_t *dirty_rams, int length,
+ int dirty_flags);
+
void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
int dirty_flags);
void cpu_tlb_update_dirty(CPUState *env);
diff --git a/exec.c b/exec.c
index bf8d703..d5c2a05 100644
--- a/exec.c
+++ b/exec.c
@@ -1962,6 +1962,73 @@ static inline void tlb_reset_dirty_range(CPUTLBEntry *tlb_entry,
}
}
+/* It checks the first row and puts dirty addrs in the array.
+ If the first row is empty, it skips to the first non-dirty row
+ or the end addr, and put the length in the first entry of the array. */
+int cpu_physical_memory_get_dirty_range(ram_addr_t start, ram_addr_t end,
+ ram_addr_t *dirty_rams, int length,
+ int dirty_flag)
+{
+ unsigned long p = 0, page_number;
+ ram_addr_t addr;
+ ram_addr_t s_idx = (start >> TARGET_PAGE_BITS) / HOST_LONG_BITS;
+ ram_addr_t e_idx = (end >> TARGET_PAGE_BITS) / HOST_LONG_BITS;
+ int i, j, offset, dirty_idx = dirty_flag_to_idx(dirty_flag);
+
+ /* mask bits before the start addr */
+ offset = (start >> TARGET_PAGE_BITS) & (HOST_LONG_BITS - 1);
+ cpu_physical_memory_sync_master(s_idx);
+ p |= phys_ram_dirty[dirty_idx][s_idx] & ~((1UL << offset) - 1);
+
+ if (s_idx == e_idx) {
+ /* mask bits after the end addr */
+ offset = (end >> TARGET_PAGE_BITS) & (HOST_LONG_BITS - 1);
+ p &= (1UL << offset) - 1;
+ }
+
+ if (p == 0) {
+ /* when the row is empty */
+ ram_addr_t skip;
+ if (s_idx == e_idx) {
+ skip = end;
+ } else {
+ /* skip empty rows */
+ while (s_idx < e_idx) {
+ s_idx++;
+ cpu_physical_memory_sync_master(s_idx);
+
+ if (phys_ram_dirty[dirty_idx][s_idx] != 0) {
+ break;
+ }
+ }
+ skip = (s_idx * HOST_LONG_BITS * TARGET_PAGE_SIZE);
+ }
+ dirty_rams[0] = skip - start;
+ i = 0;
+
+ } else if (p == ~0UL) {
+ /* when the row is fully dirtied */
+ addr = start;
+ for (i = 0; i < length; i++) {
+ dirty_rams[i] = addr;
+ addr += TARGET_PAGE_SIZE;
+ }
+ } else {
+ /* when the row is partially dirtied */
+ i = 0;
+ do {
+ j = ffsl(p) - 1;
+ p &= ~(1UL << j);
+ page_number = s_idx * HOST_LONG_BITS + j;
+ addr = page_number * TARGET_PAGE_SIZE;
+ dirty_rams[i] = addr;
+ i++;
+ } while (p != 0 && i < length);
+ }
+
+ return i;
+}
+
/* Note: start and end must be within the same ram block. */
void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
int dirty_flags)
--
1.7.0.31.g1df487
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
