[Xen-devel] [V3 PATCH 4/9] 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>
---
 xen/include/asm-x86/guest_pt.h    |  7 +++++++
 xen/include/asm-x86/page.h        |  5 +++++
 xen/include/asm-x86/x86_64/page.h | 12 ++++++++++++
 3 files changed, 24 insertions(+)

diff --git a/xen/include/asm-x86/guest_pt.h b/xen/include/asm-x86/guest_pt.h
index 3447973..6b0af70 100644
--- a/xen/include/asm-x86/guest_pt.h
+++ b/xen/include/asm-x86/guest_pt.h
@@ -154,6 +154,13 @@ static inline u32 guest_l4e_get_flags(guest_l4e_t gl4e)
 { return l4e_get_flags(gl4e); }
 #endif
 
+static inline u32 guest_l1e_get_pkeys(guest_l1e_t gl1e)
+{ return l1e_get_pkeys(gl1e); }
+static inline u32 guest_l2e_get_pkeys(guest_l2e_t gl2e)
+{ return l2e_get_pkeys(gl2e); }
+static inline u32 guest_l3e_get_pkeys(guest_l3e_t gl3e)
+{ return l3e_get_pkeys(gl3e); }
+
 static inline guest_l1e_t guest_l1e_from_gfn(gfn_t gfn, u32 flags)
 { return l1e_from_pfn(gfn_x(gfn), flags); }
 static inline guest_l2e_t guest_l2e_from_gfn(gfn_t gfn, u32 flags)
diff --git a/xen/include/asm-x86/page.h b/xen/include/asm-x86/page.h
index a095a93..93a0db0 100644
--- a/xen/include/asm-x86/page.h
+++ b/xen/include/asm-x86/page.h
@@ -93,6 +93,11 @@
 #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))
+
 /* 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..3ca489a 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.
+ *
+ * Notice: Bit 22 is used by _PAGE_GNTTAB which is visible to PV guests,
+ * so Protection keys must be disabled on PV guests.
+ */
+#define _PAGE_PKEY_BITS  (0x780000)     /* Protection Keys, 22:19 */
+
+#define get_pte_pkeys(x) (MASK_EXTR(get_pte_flags(x), _PAGE_PKEY_BITS))
+
 /* 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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