[PATCH v2 11/36] KVM: nVMX: Add alignment check for struct vmcs12

[isaku . yamahata]

From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

As struct vmcs12 has __packed attributes and it has manual alignment,
it's easy to add unaligned member without any warnings.  Add alignment
check to avoid accidental misalignment.

Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
 arch/x86/kvm/vmx/vmcs12.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h
index 21cd1b75e4fd..8c9d4c22b960 100644
--- a/arch/x86/kvm/vmx/vmcs12.h
+++ b/arch/x86/kvm/vmx/vmcs12.h
@@ -217,7 +217,8 @@ struct __packed vmcs12 {
  * although appending fields and/or filling gaps is obviously allowed.
  */
 #define CHECK_OFFSET(field, loc) \
-	ASSERT_STRUCT_OFFSET(struct vmcs12, field, loc)
+	ASSERT_STRUCT_OFFSET(struct vmcs12, field, loc);		\
+	static_assert(loc % __alignof(((struct vmcs12 *)0)->field) == 0)
 
 static inline void vmx_check_vmcs12_offsets(void)
 {
-- 
2.45.2