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, 1 insertions, 5 deletions

diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index e24fa50dc9..f62f7ac288 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -496,11 +496,7 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
 bool kvmppc_is_mem_backend_page_size_ok(const char *obj_path)
 {
     Object *mem_obj = object_resolve_path(obj_path, NULL);
-    char *mempath = object_property_get_str(mem_obj, "mem-path", NULL);
-    long pagesize;
-
-    pagesize = qemu_mempath_getpagesize(mempath);
-    g_free(mempath);
+    long pagesize = host_memory_backend_pagesize(MEMORY_BACKEND(mem_obj));
 
     return pagesize >= max_cpu_page_size;
 }