hostmem: Apply merge property after the memory region is initialized

The semantic change has been introduced by commit 5becdc0ab0 ("hostmem:
simplify the code for merge and dump properties") even it clarifies that
no senmatic change has been introduced. After the commit, the merge
property can be applied even the corresponding memory region isn't
initialized yet. This leads to crash dump by the following command
lines.

  # /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64  \
    -accel kvm  -machine virt -cpu host                      \
    -object memory-backend-ram,id=mem-memN0,size=4096M,merge=off
    :
    qemu-system-aarch64: ../system/memory.c:2419: memory_region_get_ram_ptr: \
    Assertion `mr->ram_block' failed.

Fix it by applying the merge property only when the memory region is
initialized.

Message-ID: <20240915233117.478169-1-gshan@redhat.com>
Fixes: 5becdc0ab083 ("hostmem: simplify the code for merge and dump properties")
Reported-by: Zhenyu Zhang <zhenyzha@redhat.com>
Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
Signed-off-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>

diff --git a/backends/hostmem.c b/backends/hostmem.c
index 4e5576a4adad8d5443be2ae2b64ba90d3129e12f..181446626ae564a02b4dbdfe8e973293788d3bd9 100644 (file)
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -178,7 +178,7 @@ static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp)
         return;
     }
 
-    if (!host_memory_backend_mr_inited(backend) &&
+    if (host_memory_backend_mr_inited(backend) &&
         value != backend->merge) {
         void *ptr = memory_region_get_ram_ptr(&backend->mr);
         uint64_t sz = memory_region_size(&backend->mr);