[PATCH 4/5] exec, memory: Call to xen_modified_memory.

[Alex Bligh <alex@alex.org.uk>]

This patch add some calls to xen_modified_memory to notify Xen about dirtybits
during migration.

Backport of e226939de5814527a21396903b08c3d0ed989558

Signed-off-by: Alex Bligh <alex@alex.org.uk>
---
 exec.c   |    4 ++++
 memory.c |    4 ++++
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/exec.c b/exec.c
index 511777b..401f9bc 100644
--- a/exec.c
+++ b/exec.c
@@ -2988,6 +2988,9 @@ ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
     memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
            0xff, size >> TARGET_PAGE_BITS);
 
+    if (xen_enabled())
+        xen_modified_memory(new_block->offset, size);
+
     if (kvm_enabled())
         kvm_setup_guest_memory(new_block->host, size);
 
@@ -3961,6 +3964,7 @@ static void invalidate_and_set_dirty(target_phys_addr_t addr,
         /* set dirty bit */
         cpu_physical_memory_set_dirty_flags(addr, (0xff & ~CODE_DIRTY_FLAG));
     }
+    xen_modified_memory(addr, length);
 }
 
 void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf,
diff --git a/memory.c b/memory.c
index 7c20a07..6e0c596 100644
--- a/memory.c
+++ b/memory.c
@@ -16,6 +16,7 @@
 #include "ioport.h"
 #include "bitops.h"
 #include "kvm.h"
+#include "hw/xen.h"
 #include <assert.h>
 
 unsigned memory_region_transaction_depth = 0;
@@ -1065,6 +1066,9 @@ bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
 void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr)
 {
     assert(mr->terminates);
+    if (xen_enabled())
+        xen_modified_memory((mr->ram_addr + addr) & TARGET_PAGE_MASK,
+                            TARGET_PAGE_SIZE);
     return cpu_physical_memory_set_dirty(mr->ram_addr + addr);
 }
 
-- 
1.7.4.1