linux-kernel - [PATCH v4 08/23] KVM: x86: do not define KVM_REQ

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Date:   Tue, 25 Oct 2022 15:42:08 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Yang Zhong <yang.zhong@...el.com>,
        linux-kselftest@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Borislav Petkov <bp@...en8.de>,
        Guang Zeng <guang.zeng@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        Wei Wang <wei.w.wang@...el.com>,
        Jim Mattson <jmattson@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, x86@...nel.org,
        Shuah Khan <shuah@...nel.org>
Subject: [PATCH v4 08/23] KVM: x86: do not define KVM_REQ_SMI if SMM disabled

From: Paolo Bonzini <pbonzini@...hat.com>

This ensures that all the relevant code is compiled out, in fact
the process_smi stub can be removed too.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/include/asm/kvm_host.h | 2 ++
 arch/x86/kvm/smm.h              | 1 -
 arch/x86/kvm/x86.c              | 6 ++++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 28e41926027e7a..0b0a82c0bb5cbd 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -81,7 +81,9 @@
 #define KVM_REQ_NMI			KVM_ARCH_REQ(9)
 #define KVM_REQ_PMU			KVM_ARCH_REQ(10)
 #define KVM_REQ_PMI			KVM_ARCH_REQ(11)
+#ifdef CONFIG_KVM_SMM
 #define KVM_REQ_SMI			KVM_ARCH_REQ(12)
+#endif
 #define KVM_REQ_MASTERCLOCK_UPDATE	KVM_ARCH_REQ(13)
 #define KVM_REQ_MCLOCK_INPROGRESS \
 	KVM_ARCH_REQ_FLAGS(14, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
index 7ccce6b655cacf..a6795b93ba3002 100644
--- a/arch/x86/kvm/smm.h
+++ b/arch/x86/kvm/smm.h
@@ -28,7 +28,6 @@ void process_smi(struct kvm_vcpu *vcpu);
 static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; }
 static inline bool is_smm(struct kvm_vcpu *vcpu) { return false; }
 static inline void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm) { WARN_ON_ONCE(1); }
-static inline void process_smi(struct kvm_vcpu *vcpu) { WARN_ON_ONCE(1); }
 
 /*
  * emulator_leave_smm is used as a function pointer, so the
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8394cd62c2854c..56004890a71742 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5033,8 +5033,10 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
 
 	process_nmi(vcpu);
 
+#ifdef CONFIG_KVM_SMM
 	if (kvm_check_request(KVM_REQ_SMI, vcpu))
 		process_smi(vcpu);
+#endif
 
 	/*
 	 * KVM's ABI only allows for one exception to be migrated.  Luckily,
@@ -10207,8 +10209,10 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		}
 		if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
 			record_steal_time(vcpu);
+#ifdef CONFIG_KVM_SMM
 		if (kvm_check_request(KVM_REQ_SMI, vcpu))
 			process_smi(vcpu);
+#endif
 		if (kvm_check_request(KVM_REQ_NMI, vcpu))
 			process_nmi(vcpu);
 		if (kvm_check_request(KVM_REQ_PMU, vcpu))
@@ -12565,7 +12569,9 @@ bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
 		return true;
 
 	if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
+#ifdef CONFIG_KVM_SMM
 		kvm_test_request(KVM_REQ_SMI, vcpu) ||
+#endif
 		 kvm_test_request(KVM_REQ_EVENT, vcpu))
 		return true;
 
-- 
2.34.3