linux-kernel - [PATCH 10/10] KVM: x86: do not define SMM-related constants if SMM disabled

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Date:   Thu, 27 Oct 2022 12:49:44 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     mlevitsk@...hat.com, seanjc@...gle.com
Subject: [PATCH 10/10] KVM: x86: do not define SMM-related constants if SMM disabled

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/include/asm/kvm_host.h | 3 ++-
 arch/x86/kvm/smm.c              | 3 +++
 arch/x86/kvm/x86.c              | 4 ++--
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 7ddcc0e6fae5..89c89c70f74e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1992,10 +1992,11 @@ enum {
 #define HF_NMI_MASK		(1 << 3)
 #define HF_IRET_MASK		(1 << 4)
 #define HF_GUEST_MASK		(1 << 5) /* VCPU is in guest-mode */
+
+#ifdef CONFIG_KVM_SMM
 #define HF_SMM_MASK		(1 << 6)
 #define HF_SMM_INSIDE_NMI_MASK	(1 << 7)
 
-#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)
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index 41ca128478fc..44a8f7e57b77 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -10,6 +10,9 @@
 
 void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
 {
+	BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK);
+	BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK);
+
 	trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm);
 
 	if (entering_smm) {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5959f74c5a0a..910e3757b222 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5092,10 +5092,12 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
 
 	/* events->sipi_vector is never valid when reporting to user space */
 
+#ifdef CONFIG_KVM_SMM
 	events->smi.smm = is_smm(vcpu);
 	events->smi.pending = vcpu->arch.smi_pending;
 	events->smi.smm_inside_nmi =
 		!!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK);
+#endif
 	events->smi.latched_init = kvm_lapic_latched_init(vcpu);
 
 	events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
@@ -8266,8 +8268,6 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
 		     cs_db				? X86EMUL_MODE_PROT32 :
 							  X86EMUL_MODE_PROT16;
 	BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK);
-	BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK);
-	BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK);
 
 	ctxt->interruptibility = 0;
 	ctxt->have_exception = false;
-- 
2.31.1