From: Jan Kiszka <jan.kis...@siemens.com>

This restore the behavior prior to b018ddf633 which accidentally changed
the return code to 0. Specifically guests probing for register existence
were affected by this.

Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/memory.c b/memory.c
index 9938b6b..34a088e 100644
--- a/memory.c
+++ b/memory.c
@@ -840,7 +840,7 @@ static uint64_t unassigned_mem_read(void *opaque, hwaddr 
addr,
     if (current_cpu != NULL) {
         cpu_unassigned_access(current_cpu, addr, false, false, 0, size);
     }
-    return 0;
+    return -1ULL;
 }
 
 static void unassigned_mem_write(void *opaque, hwaddr addr,
-- 
1.8.1.4



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