This patch replaces the static memory savevm/loadvm handler with a
"live" one.
This handler is used even if performing a non-live migration.
The key difference between this handler and the previous is that each
page is
prefixed with the address of the page. The QEMUFile rate limiting
code, in
combination with the live migration dirty tracking bits, is used to
determine
which pages should be sent and how many should be sent.
The live save code "converges" when the number of dirty pages reaches
a fixed
amount. Currently, this is 10 pages. This is something that should
eventually
be derived from whatever the bandwidth limitation is.
+
+static int ram_save_block(QEMUFile *f)
+{
+ static ram_addr_t current_addr = 0;
+ ram_addr_t saved_addr = current_addr;
+ ram_addr_t addr = 0;
+ int found = 0;
+
+ while (addr < phys_ram_size) {
+ if (cpu_physical_memory_get_dirty(current_addr,
MIGRATION_DIRTY_FLAG)) {
+ uint8_t ch;
+
+ cpu_physical_memory_reset_dirty(current_addr,
+ current_addr +
TARGET_PAGE_SIZE,
+ MIGRATION_DIRTY_FLAG);
+
+ ch = *(phys_ram_base + current_addr);