Add host_memory_backend_pagesize() helper

There are a couple places (one generic, one target specific) where we need
to get the host page size associated with a particular memory backend.  I
have some upcoming code which will add another place which wants this.  So,
for convenience, add a helper function to calculate this.

host_memory_backend_pagesize() returns the host pagesize for a given
HostMemoryBackend object.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/exec.c b/exec.c
index b38b004563..c7fcefa851 100644
--- a/exec.c
+++ b/exec.c
@@ -1491,9 +1491,8 @@ static int find_max_supported_pagesize(Object *obj, void *opaque)
     long *hpsize_min = opaque;
 
     if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
-        char *mem_path = object_property_get_str(obj, "mem-path", NULL);
-        long hpsize = qemu_mempath_getpagesize(mem_path);
-        g_free(mem_path);
+        long hpsize = host_memory_backend_pagesize(MEMORY_BACKEND(obj));
+
         if (hpsize < *hpsize_min) {
             *hpsize_min = hpsize;
         }