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[Qemu-devel] [PATCH] hostmem-memfd: honour share=on/off property

From: Marc-André Lureau
Subject: [Qemu-devel] [PATCH] hostmem-memfd: honour share=on/off property
Date: Tue, 28 Aug 2018 17:38:40 +0200

The share=on/off property is used to modified mmap() MAP_SHARED
setting. Make it on by default for convenience and compatibility

Signed-off-by: Marc-André Lureau <address@hidden>
 backends/hostmem-memfd.c | 4 +++-
 qemu-options.hx          | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/backends/hostmem-memfd.c b/backends/hostmem-memfd.c
index 1e20fe0ba8..abd52364db 100644
--- a/backends/hostmem-memfd.c
+++ b/backends/hostmem-memfd.c
@@ -59,7 +59,8 @@ memfd_backend_memory_alloc(HostMemoryBackend *backend, Error 
     name = object_get_canonical_path(OBJECT(backend));
     memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
-                                   name, backend->size, true, fd, errp);
+                                   name, backend->size,
+                                   backend->share, fd, errp);
@@ -131,6 +132,7 @@ memfd_backend_instance_init(Object *obj)
     /* default to sealed file */
     m->seal = true;
+    MEMORY_BACKEND(m)->share = true;
 static void
diff --git a/qemu-options.hx b/qemu-options.hx
index f14e423b7c..25c02d72b8 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4029,7 +4029,7 @@ Memory backend objects offer more control than the 
@option{-m} option that is
 traditionally used to define guest RAM. Please refer to
 @option{memory-backend-file} for a description of the options.
address@hidden -object 
address@hidden -object 
 Creates an anonymous memory file backend object, which allows QEMU to
 share the memory with an external process (e.g. when using
@@ -4051,6 +4051,8 @@ with the @option{seal} option (requires at least Linux 
 Please refer to @option{memory-backend-file} for a description of the
 other options.
+The @option{share} boolean option is @var{on} by default with memfd.
 @item -object rng-random,address@hidden,address@hidden/dev/random}
 Creates a random number generator backend which obtains entropy from

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