[PATCH for-4.20 1/4] x86/xstate: Use compression check helper in xstate_all()

[Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>]

Minor refactor to make xstate_all() use a helper rather than poking directly
into the XSAVE header.

No functional change

Signed-off-by: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
---
 xen/arch/x86/include/asm/xstate.h | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/xen/arch/x86/include/asm/xstate.h 
b/xen/arch/x86/include/asm/xstate.h
index f4a8e5f814a0..f0eeb13b87a4 100644
--- a/xen/arch/x86/include/asm/xstate.h
+++ b/xen/arch/x86/include/asm/xstate.h
@@ -122,6 +122,12 @@ static inline uint64_t xgetbv(unsigned int index)
     return lo | ((uint64_t)hi << 32);
 }
 
+static inline bool __nonnull(1)
+xsave_area_compressed(const struct xsave_struct *xsave_area)
+{
+    return xsave_area->xsave_hdr.xcomp_bv & XSTATE_COMPACTION_ENABLED;
+}
+
 static inline bool xstate_all(const struct vcpu *v)
 {
     /*
@@ -129,15 +135,8 @@ static inline bool xstate_all(const struct vcpu *v)
      * (in the legacy region of xsave area) are fixed, so saving
      * XSTATE_FP_SSE will not cause overwriting problem with XSAVES/XSAVEC.
      */
-    return (v->arch.xsave_area->xsave_hdr.xcomp_bv &
-            XSTATE_COMPACTION_ENABLED) &&
+    return xsave_area_compressed(v->arch.xsave_area) &&
            (v->arch.xcr0_accum & XSTATE_LAZY & ~XSTATE_FP_SSE);
 }
 
-static inline bool __nonnull(1)
-xsave_area_compressed(const struct xsave_struct *xsave_area)
-{
-    return xsave_area->xsave_hdr.xcomp_bv & XSTATE_COMPACTION_ENABLED;
-}
-
 #endif /* __ASM_XSTATE_H */
-- 
2.34.1