[XENBUS PATCH 1/2] Reduce the strength of Xen barriers on x86

[Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>]

x86 is TSO and only needs a compiler barrier as read/write barriers.

Signed-off-by: Tu Dinh <ngoc-tu.dinh@xxxxxxxxxx>
---
 include/xen-types.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/xen-types.h b/include/xen-types.h
index e4c19a4..3446ac7 100644
--- a/include/xen-types.h
+++ b/include/xen-types.h
@@ -47,4 +47,13 @@ typedef USHORT  uint16_t;
 typedef ULONG   uint32_t;
 typedef ULONG64 uint64_t;
 
+#define xen_mb()    KeMemoryBarrier()
+#if defined(_M_IX86) || defined(_M_X64)
+#define xen_wmb()   KeMemoryBarrierWithoutFence()
+#define xen_rmb()   KeMemoryBarrierWithoutFence()
+#else
+#define xen_wmb()   KeMemoryBarrier()
+#define xen_rmb()   KeMemoryBarrier()
+#endif
+
 #endif  // _XEN_TYPES_H
-- 
2.54.0.windows.1



--
Ngoc Tu Dinh | Vates XCP-ng Developer

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