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[Qemu-devel] [PATCH 1/2] hostmem: introduce host_memory_backend_mr_inite
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH 1/2] hostmem: introduce host_memory_backend_mr_inited() |
Date: |
Fri, 10 Mar 2017 21:09:29 +0800 |
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 <address@hidden>
Signed-off-by: Peter Xu <address@hidden>
---
backends/hostmem.c | 9 +++++++++
include/sysemu/hostmem.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/backends/hostmem.c b/backends/hostmem.c
index 7f5de70..4e9ef62 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -243,6 +243,15 @@ 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)
{
diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h
index ecae0cf..ed6a437 100644
--- a/include/sysemu/hostmem.h
+++ b/include/sysemu/hostmem.h
@@ -62,6 +62,7 @@ struct HostMemoryBackend {
MemoryRegion mr;
};
+bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend,
Error **errp);
--
2.7.4