[PATCH 1/2] kvm-unit-test: x86: Add a wrapper to check if the CPU supports NX bit in MSR_EFER

[Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>]

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
Reviewed-by: Karl Heubaum <karl.heubaum@xxxxxxxxxx>
---
 lib/x86/processor.h | 8 ++++++++
 x86/vmexit.c        | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/x86/processor.h b/lib/x86/processor.h
index 15237a5..2ca988e 100644
--- a/lib/x86/processor.h
+++ b/lib/x86/processor.h
@@ -476,4 +476,12 @@ static inline void set_bit(int bit, u8 *addr)
 			     : "+m" (*addr) : "Ir" (bit) : "cc", "memory");
 }
 
+static inline int efer_nx_enabled(void)
+{
+	if (cpuid(0x80000001).d & (1 << 20))
+		return 1;
+	else
+		return 0;
+}
+
 #endif
diff --git a/x86/vmexit.c b/x86/vmexit.c
index c12dd24..7053a46 100644
--- a/x86/vmexit.c
+++ b/x86/vmexit.c
@@ -526,7 +526,7 @@ static bool do_test(struct test *test)
 
 static void enable_nx(void *junk)
 {
-	if (cpuid(0x80000001).d & (1 << 20))
+	if (efer_nx_enabled())
 		wrmsr(MSR_EFER, rdmsr(MSR_EFER) | EFER_NX_MASK);
 }
 
-- 
2.20.1