[Qemu-devel] [RFC PATCH 1/6] memory: add incoherent cache flag

[Andrew Jones <drjones@redhat.com>]

Add an incoherent cache flag, which indicates the region
needs explicit cache maintenance.

Signed-off-by: Andrew Jones <drjones@redhat.com>
---
 include/exec/memory.h | 23 +++++++++++++++++++++++
 memory.c              | 15 +++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 06ffa1d185b93..c947b88b87241 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -158,6 +158,7 @@ struct MemoryRegion {
     bool rom_device;
     bool warning_printed; /* For reservations */
     bool flush_coalesced_mmio;
+    bool incoherent_cache;
     MemoryRegion *alias;
     hwaddr alias_offset;
     int32_t priority;
@@ -778,6 +779,28 @@ void memory_region_set_flush_coalesced(MemoryRegion *mr);
 void memory_region_clear_flush_coalesced(MemoryRegion *mr);
 
 /**
+ * memory_region_set_incoherent_cache: Flag this memory region as needing
+ *                                     explicit cache maintenance.
+ *
+ * @mr: the memory region to be updated.
+ */
+void memory_region_set_incoherent_cache(MemoryRegion *mr);
+
+/**
+ * memory_region_clear_incoherent_cache: Remove the incoherent cache flag.
+ *
+ * @mr: the memory region to be updated.
+ */
+void memory_region_clear_incoherent_cache(MemoryRegion *mr);
+
+/**
+ * memory_region_has_incoherent_cache: Return the incoherent cache flag.
+ *
+ * @mr: the memory region to check.
+ */
+bool memory_region_has_incoherent_cache(MemoryRegion *mr);
+
+/**
  * memory_region_add_eventfd: Request an eventfd to be triggered when a word
  *                            is written to a location.
  *
diff --git a/memory.c b/memory.c
index 20f6d9eeac737..fa74bcb8c1e4c 100644
--- a/memory.c
+++ b/memory.c
@@ -1549,6 +1549,21 @@ void memory_region_clear_flush_coalesced(MemoryRegion *mr)
     }
 }
 
+void memory_region_set_incoherent_cache(MemoryRegion *mr)
+{
+    mr->incoherent_cache = true;
+}
+
+void memory_region_clear_incoherent_cache(MemoryRegion *mr)
+{
+    mr->incoherent_cache = false;
+}
+
+bool memory_region_has_incoherent_cache(MemoryRegion *mr)
+{
+    return mr->incoherent_cache;
+}
+
 void memory_region_add_eventfd(MemoryRegion *mr,
                                hwaddr addr,
                                unsigned size,
-- 
1.8.3.1