[Xen-devel] [V2 PATCH 6/9] x86/hvm: pkeys, add functions to support PKRU access

[Huaitong Han <huaitong.han@xxxxxxxxx>]

This patch adds functions to support PKRU access.

Signed-off-by: Huaitong Han <huaitong.han@xxxxxxxxx>
---
 xen/include/asm-x86/processor.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index 3f8411f..68d86cb 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -342,6 +342,21 @@ static inline void write_cr4(unsigned long val)
     asm volatile ( "mov %0,%%cr4" : : "r" (val) );
 }
 
+/* Macros for PKRU domain */
+#define PKRU_READ  0
+#define PKRU_WRITE 1
+#define PKRU_ATTRS 2
+
+/*
+ * PKRU defines 32 bits, there are 16 domains and 2 attribute bits per
+ * domain in pkru, pkeys is index to a defined domain, so the value of
+ * pte_pkeys * PKRU_ATTRS + R/W is offset of a defined domain attribute.
+ */
+#define READ_PKRU_AD(pkru, pkey) \
+    ((pkru >> (pkey * PKRU_ATTRS + PKRU_READ)) & 1)
+#define READ_PKRU_WD(pkru, pkey) \
+    ((pkru >> (pkey * PKRU_ATTRS + PKRU_WRITE)) & 1)
+
 /* Clear and set 'TS' bit respectively */
 static inline void clts(void) 
 {
-- 
2.4.3


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