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authorPeter Xu <peterx@redhat.com>2017-03-10 21:09:29 +0800
committerEduardo Habkost <ehabkost@redhat.com>2017-04-20 15:22:41 -0300
commit4728b5741040df8bd02a5ad8fd3c2beefae3dcb1 (patch)
tree86294e46f43683248c85313a53b05e6214100eaa /backends/hostmem.c
parent991db247745c1de161d665f847fd28618212f2e8 (diff)
hostmem: introduce host_memory_backend_mr_inited()
We were checking this against memory region size of host memory backend's mr field to see whether the mr has been inited. This is efficient but less elegant. Let's make a helper for it to avoid confusions, along with some notes. Suggested-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1489151370-15453-2-git-send-email-peterx@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'backends/hostmem.c')
-rw-r--r--backends/hostmem.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/backends/hostmem.c b/backends/hostmem.c
index 89feb9ed75..d8faab4bed 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -237,6 +237,15 @@ static void host_memory_backend_init(Object *obj)
backend->prealloc = mem_prealloc;
}
+bool host_memory_backend_mr_inited(HostMemoryBackend *backend)
+{
+ /*
+ * NOTE: We forbid zero-length memory backend, so here zero means
+ * "we haven't inited the backend memory region yet".
+ */
+ return memory_region_size(&backend->mr) != 0;
+}
+
MemoryRegion *
host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp)
{