[RFC PATCH 08/19] HostMem: Add private property to indicate to use kvm gmem

[Xiaoyao Li <xiaoyao.li@xxxxxxxxx>]

From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
 backends/hostmem.c       | 18 ++++++++++++++++++
 include/sysemu/hostmem.h |  2 +-
 qapi/qom.json            |  4 ++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/backends/hostmem.c b/backends/hostmem.c
index 747e7838c031..dbdbb0aafd45 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -461,6 +461,20 @@ static void host_memory_backend_set_reserve(Object *o, bool value, Error **errp)
     }
     backend->reserve = value;
 }
+
+static bool host_memory_backend_get_private(Object *o, Error **errp)
+{
+    HostMemoryBackend *backend = MEMORY_BACKEND(o);
+
+    return backend->private;
+}
+
+static void host_memory_backend_set_private(Object *o, bool value, Error **errp)
+{
+    HostMemoryBackend *backend = MEMORY_BACKEND(o);
+
+    backend->private = value;
+}
 #endif /* CONFIG_LINUX */
 
 static bool
@@ -541,6 +555,10 @@ host_memory_backend_class_init(ObjectClass *oc, void *data)
         host_memory_backend_get_reserve, host_memory_backend_set_reserve);
     object_class_property_set_description(oc, "reserve",
         "Reserve swap space (or huge pages) if applicable");
+    object_class_property_add_bool(oc, "private",
+        host_memory_backend_get_private, host_memory_backend_set_private);
+    object_class_property_set_description(oc, "private",
+        "Use KVM gmem private memory");
 #endif /* CONFIG_LINUX */
     /*
      * Do not delete/rename option. This option must be considered stable
diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h
index 39326f1d4f9c..d88970395618 100644
--- a/include/sysemu/hostmem.h
+++ b/include/sysemu/hostmem.h
@@ -65,7 +65,7 @@ struct HostMemoryBackend {
     /* protected */
     uint64_t size;
     bool merge, dump, use_canonical_path;
-    bool prealloc, is_mapped, share, reserve;
+    bool prealloc, is_mapped, share, reserve, private;
     uint32_t prealloc_threads;
     ThreadContext *prealloc_context;
     DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
diff --git a/qapi/qom.json b/qapi/qom.json
index 7f92ea43e8e1..e0b2044e3d20 100644
--- a/qapi/qom.json
+++ b/qapi/qom.json
@@ -605,6 +605,9 @@
 # @reserve: if true, reserve swap space (or huge pages) if applicable
 #     (default: true) (since 6.1)
 #
+# @private: if true, use KVM gmem private memory
+#           (default: false) (since 8.1)
+#
 # @size: size of the memory region in bytes
 #
 # @x-use-canonical-path-for-ramblock-id: if true, the canonical path
@@ -631,6 +634,7 @@
             '*prealloc-context': 'str',
             '*share': 'bool',
             '*reserve': 'bool',
+            '*private': 'bool',
             'size': 'size',
             '*x-use-canonical-path-for-ramblock-id': 'bool' } }
 
-- 
2.34.1