[Xen-devel] [PATCH V5 5/6] x86/hvm: pkeys, add xstate support for pkeys

[Huaitong Han <huaitong.han@xxxxxxxxx>]

This patch adds xstate support for pkeys.

Signed-off-by: Huaitong Han <huaitong.han@xxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/xstate.c        | 3 ++-
 xen/include/asm-x86/xstate.h | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/xstate.c b/xen/arch/x86/xstate.c
index b65da38..baa4b58 100644
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -487,7 +487,8 @@ void xstate_init(struct cpuinfo_x86 *c)
      * Set CR4_OSXSAVE and run "cpuid" to get xsave_cntxt_size.
      */
     set_in_cr4(X86_CR4_OSXSAVE);
-    if ( !set_xcr0(feature_mask) )
+    /* PKU is disabled on PV mode. */
+    if ( !set_xcr0(feature_mask & ~XSTATE_PKRU) )
         BUG();
 
     if ( bsp )
diff --git a/xen/include/asm-x86/xstate.h b/xen/include/asm-x86/xstate.h
index 12d939b..f7c41ba 100644
--- a/xen/include/asm-x86/xstate.h
+++ b/xen/include/asm-x86/xstate.h
@@ -34,13 +34,15 @@
 #define XSTATE_OPMASK  (1ULL << 5)
 #define XSTATE_ZMM     (1ULL << 6)
 #define XSTATE_HI_ZMM  (1ULL << 7)
+#define XSTATE_PKRU    (1ULL << 9)
 #define XSTATE_LWP     (1ULL << 62) /* AMD lightweight profiling */
 #define XSTATE_FP_SSE  (XSTATE_FP | XSTATE_SSE)
 #define XCNTXT_MASK    (XSTATE_FP | XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK | \
                         XSTATE_ZMM | XSTATE_HI_ZMM | XSTATE_NONLAZY)
 
 #define XSTATE_ALL     (~(1ULL << 63))
-#define XSTATE_NONLAZY (XSTATE_LWP | XSTATE_BNDREGS | XSTATE_BNDCSR)
+#define XSTATE_NONLAZY (XSTATE_LWP | XSTATE_BNDREGS | XSTATE_BNDCSR | \
+                        XSTATE_PKRU)
 #define XSTATE_LAZY    (XSTATE_ALL & ~XSTATE_NONLAZY)
 #define XSTATE_COMPACTION_ENABLED  (1ULL << 63)
 
-- 
2.4.3


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