diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 06262e5f01bc..b3e531baa626 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -196,6 +196,8 @@ struct kvm_arch {
 #define KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER	0
 	/* Memory Tagging Extension enabled for the guest */
 #define KVM_ARCH_FLAG_MTE_ENABLED			1
+	/* Guest has bought into the MMIO guard extension */
+#define KVM_ARCH_FLAG_MMIO_GUARD			2
 	unsigned long flags;
 
 	/*