[PATCH] qapi: clarify that the default is backend dependent

[Stefano Garzarella <sgarzare@redhat.com>]

The default value of the @share option of the @MemoryBackendProperties
eally depends on the backend type, so let's document it explicitly and
add the default value where it was missing.

Cc: David Hildenbrand <david@redhat.com>
Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
---
I followed how we document @share in memfd and epc, but I don't like it
very much, I just can't think of a better way, so if you have a suggestion
I can change them in all of them.

Thanks,
Stefano
---
 qapi/qom.json | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/qapi/qom.json b/qapi/qom.json
index 38dde6d785..8463bd32a2 100644
--- a/qapi/qom.json
+++ b/qapi/qom.json
@@ -600,7 +600,7 @@
 #     preallocation threads (default: none) (since 7.2)
 #
 # @share: if false, the memory is private to QEMU; if true, it is
-#     shared (default: false)
+#     shared (default depends on the backend type)
 #
 # @reserve: if true, reserve swap space (or huge pages) if applicable
 #     (default: true) (since 6.1)
@@ -639,6 +639,8 @@
 #
 # Properties for memory-backend-file objects.
 #
+# The @share boolean option is false by default with file.
+#
 # @align: the base address alignment when QEMU mmap(2)s @mem-path.
 #     Some backend stores specified by @mem-path require an alignment
 #     different than the default one used by QEMU, e.g. the device DAX
-- 
2.45.1