KVM: x86: remove SMRAM address space if SMM is not supported

If CONFIG_KVM_SMM is not defined HF_SMM_MASK will always be zero, and
we can spare userspace the hassle of setting up the SMRAM address space
simply by reporting that only one address space is supported.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220929172016.319443-8-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -1998,11 +1998,14 @@ enum {
 #define HF_SMM_MASK		(1 << 6)
 #define HF_SMM_INSIDE_NMI_MASK	(1 << 7)
 
-#define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
-#define KVM_ADDRESS_SPACE_NUM 2
-
-#define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
-#define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
+#ifdef CONFIG_KVM_SMM
+# define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
+# define KVM_ADDRESS_SPACE_NUM 2
+# define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
+# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
+#else
+# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0)
+#endif
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER