kvm: Rework dirty bitmap synchronization

Extend kvm_physical_sync_dirty_bitmap() so that is can sync across
multiple slots. Useful for updating the whole dirty log during
migration. Moreover, properly pass down errors the whole call chain.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/exec.c b/exec.c
index c5c92809eb..544fb43074 100644
--- a/exec.c
+++ b/exec.c
@@ -1931,10 +1931,14 @@ int cpu_physical_memory_get_dirty_tracking(void)
     return in_migration;
 }
 
-void cpu_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, target_phys_addr_t end_addr)
+int cpu_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
+                                   target_phys_addr_t end_addr)
 {
+    int ret = 0;
+
     if (kvm_enabled())
-        kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
+        ret = kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
+    return ret;
 }
 
 static inline void tlb_update_dirty(CPUTLBEntry *tlb_entry)