pc: Avoid registering zero sized memory

No need to call cpu_register_physical_memory() for a zero sized area.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/hw/pc.c b/hw/pc.c
index a96187f5b5..58dea57f8e 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -916,8 +916,10 @@ void pc_memory_init(ram_addr_t ram_size,
                  below_4g_mem_size - 0x100000,
                  ram_addr + 0x100000);
 #if TARGET_PHYS_ADDR_BITS > 32
-    cpu_register_physical_memory(0x100000000ULL, above_4g_mem_size,
-                                 ram_addr + below_4g_mem_size);
+    if (above_4g_mem_size > 0) {
+        cpu_register_physical_memory(0x100000000ULL, above_4g_mem_size,
+                                     ram_addr + below_4g_mem_size);
+    }
 #endif
 
     /* BIOS load */