[Xen-devel] [PATCH 06/10] x86/hvm: pkeys, add functions to get pkeys value from PTE

[Huaitong Han <huaitong.han@xxxxxxxxx>]

This patch adds functions to get pkeys value from PTE.

Signed-off-by: Huaitong Han <huaitong.han@xxxxxxxxx>

diff --git a/xen/include/asm-x86/page.h b/xen/include/asm-x86/page.h
index 87b3341..1cdbfc8 100644
--- a/xen/include/asm-x86/page.h
+++ b/xen/include/asm-x86/page.h
@@ -93,6 +93,13 @@
 #define l3e_get_flags(x)           (get_pte_flags((x).l3))
 #define l4e_get_flags(x)           (get_pte_flags((x).l4))
 
+/* Get pte pkeys (unsigned int). */
+#define l1e_get_pkeys(x)           (get_pte_pkeys((x).l1))
+#define l2e_get_pkeys(x)           (get_pte_pkeys((x).l2))
+#define l3e_get_pkeys(x)           (get_pte_pkeys((x).l3))
+#define l4e_get_pkeys(x)           (get_pte_pkeys((x).l4))
+
+
 /* Construct an empty pte. */
 #define l1e_empty()                ((l1_pgentry_t) { 0 })
 #define l2e_empty()                ((l2_pgentry_t) { 0 })
diff --git a/xen/include/asm-x86/x86_64/page.h 
b/xen/include/asm-x86/x86_64/page.h
index 19ab4d0..03418ba 100644
--- a/xen/include/asm-x86/x86_64/page.h
+++ b/xen/include/asm-x86/x86_64/page.h
@@ -134,6 +134,18 @@ typedef l4_pgentry_t root_pgentry_t;
 #define get_pte_flags(x) (((int)((x) >> 40) & ~0xFFF) | ((int)(x) & 0xFFF))
 #define put_pte_flags(x) (((intpte_t)((x) & ~0xFFF) << 40) | ((x) & 0xFFF))
 
+/*
+* Protection keys define a new 4-bit protection key field
+* (PKEY) in bits 62:59 of leaf entries of the page tables.
+* This corresponds to bit 22:19 of a 24-bit flags.
+*/
+#define _PAGE_PKEY_BIT0 19       /* Protection Keys, bit 1/4 */
+#define _PAGE_PKEY_BIT1 20       /* Protection Keys, bit 2/4 */
+#define _PAGE_PKEY_BIT2 21       /* Protection Keys, bit 3/4 */
+#define _PAGE_PKEY_BIT3 22       /* Protection Keys, bit 4/4 */
+
+#define get_pte_pkeys(x) ((int)(get_pte_flags(x) >> _PAGE_PKEY_BIT0) & 0xF)
+
 /* Bit 23 of a 24-bit flag mask. This corresponds to bit 63 of a pte.*/
 #define _PAGE_NX_BIT (1U<<23)
 
-- 
2.4.3


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