[Qemu-devel] [PATCH] migration: don't set MIGRATION dirty range for ignored block

[Wei Yang]

The ignored blocks are not migrated and those ranges are not used.

Signed-off-by: Wei Yang <richardw.y...@linux.intel.com>
---
 exec.c                  | 4 +++-
 include/exec/ram_addr.h | 2 ++
 migration/ram.c         | 2 +-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/exec.c b/exec.c
index 86a38d3b3b..97da155c12 100644
--- a/exec.c
+++ b/exec.c
@@ -2192,6 +2192,8 @@ static void ram_block_add(RAMBlock *new_block, Error 
**errp, bool shared)
     RAMBlock *last_block = NULL;
     ram_addr_t old_ram_size, new_ram_size;
     Error *err = NULL;
+    uint8_t dirty_memory_clients = ramblock_is_ignored(new_block) ?
+                         DIRTY_CLIENTS_NOMIG : DIRTY_CLIENTS_ALL;
 
     old_ram_size = last_ram_page();
 
@@ -2252,7 +2254,7 @@ static void ram_block_add(RAMBlock *new_block, Error 
**errp, bool shared)
 
     cpu_physical_memory_set_dirty_range(new_block->offset,
                                         new_block->used_length,
-                                        DIRTY_CLIENTS_ALL);
+                                        dirty_memory_clients);
 
     if (new_block->host) {
         qemu_ram_setup_dump(new_block->host, new_block->max_length);
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index a7c81bdb32..4765435fb8 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -72,6 +72,7 @@ static inline unsigned long int 
ramblock_recv_bitmap_offset(void *host_addr,
 }
 
 bool ramblock_is_pmem(RAMBlock *rb);
+bool ramblock_is_ignored(RAMBlock *rb);
 
 long qemu_getrampagesize(void);
 
@@ -117,6 +118,7 @@ int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, 
Error **errp);
 
 #define DIRTY_CLIENTS_ALL     ((1 << DIRTY_MEMORY_NUM) - 1)
 #define DIRTY_CLIENTS_NOCODE  (DIRTY_CLIENTS_ALL & ~(1 << DIRTY_MEMORY_CODE))
+#define DIRTY_CLIENTS_NOMIG   (DIRTY_CLIENTS_ALL & ~(1 << 
DIRTY_MEMORY_MIGRATION))
 
 void tb_invalidate_phys_range(ram_addr_t start, ram_addr_t end);
 
diff --git a/migration/ram.c b/migration/ram.c
index 1def8122e9..44525e3816 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -159,7 +159,7 @@ out:
     return ret;
 }
 
-static bool ramblock_is_ignored(RAMBlock *block)
+bool ramblock_is_ignored(RAMBlock *block)
 {
     return !qemu_ram_is_migratable(block) ||
            (migrate_ignore_shared() && qemu_ram_is_shared(block));
-- 
2.19.1