[RFC PATCH v2 04/21] memory: Introduce memory_region_has_gmem_fd()

[Xiaoyao Li]

Introduce memory_region_has_gmem_fd() to query if the MemoryRegion has
KVM gmem fd allocated.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 include/exec/memory.h | 10 ++++++++++
 softmmu/memory.c      |  5 +++++
 2 files changed, 15 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 227cb2578e95..4b8486ca3632 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1674,6 +1674,16 @@ static inline bool memory_region_is_romd(MemoryRegion 
*mr)
  */
 bool memory_region_is_protected(MemoryRegion *mr);
 
+/**
+ * memory_region_has_gmem_fd: check whether a memory region has KVM gmem fd
+ *     associated
+ *
+ * Returns %true if a memory region's ram_block has valid gmem fd assigned.
+ *
+ * @mr: the memory region being queried
+ */
+bool memory_region_has_gmem_fd(MemoryRegion *mr);
+
 /**
  * memory_region_get_iommu: check whether a memory region is an iommu
  *
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 7d9494ce7028..e69a5f96d5d1 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1846,6 +1846,11 @@ bool memory_region_is_protected(MemoryRegion *mr)
     return mr->ram && (mr->ram_block->flags & RAM_PROTECTED);
 }
 
+bool memory_region_has_gmem_fd(MemoryRegion *mr)
+{
+    return mr->ram_block && mr->ram_block->gmem_fd >= 0;
+}
+
 uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr)
 {
     uint8_t mask = mr->dirty_log_mask;
-- 
2.34.1