[PATCH v3 2/6] KVM: x86: introduce ISA specific smi_allowed callback

[Ladi Prosek <lprosek@redhat.com>]

Similar to NMI, there may be ISA specific reasons why an SMI cannot be
injected into the guest. This commit adds a new smi_allowed callback to
be implemented in following commits.

Signed-off-by: Ladi Prosek <lprosek@redhat.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/svm.c              | 6 ++++++
 arch/x86/kvm/vmx.c              | 6 ++++++
 arch/x86/kvm/x86.c              | 2 +-
 4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 596f2e826327..2445b2ba26f9 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1062,6 +1062,7 @@ struct kvm_x86_ops {
 
 	void (*setup_mce)(struct kvm_vcpu *vcpu);
 
+	int (*smi_allowed)(struct kvm_vcpu *vcpu);
 	int (*prep_enter_smm)(struct kvm_vcpu *vcpu, char *smstate);
 	int (*post_leave_smm)(struct kvm_vcpu *vcpu, u64 smbase);
 };
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index cdbbf9537111..1d8dd364ead0 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5393,6 +5393,11 @@ static void svm_setup_mce(struct kvm_vcpu *vcpu)
 	vcpu->arch.mcg_cap &= 0x1ff;
 }
 
+static int svm_smi_allowed(struct kvm_vcpu *vcpu)
+{
+	return 1;
+}
+
 static int svm_prep_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
 {
 	/* TODO: Implement */
@@ -5516,6 +5521,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
 	.update_pi_irte = svm_update_pi_irte,
 	.setup_mce = svm_setup_mce,
 
+	.smi_allowed = svm_smi_allowed,
 	.prep_enter_smm = svm_prep_enter_smm,
 	.post_leave_smm = svm_post_leave_smm,
 };
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 10f5526f1069..5ddd092fb140 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -11946,6 +11946,11 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu)
 			~FEATURE_CONTROL_LMCE;
 }
 
+static int vmx_smi_allowed(struct kvm_vcpu *vcpu)
+{
+	return 1;
+}
+
 static int vmx_prep_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
 {
 	/* TODO: Implement */
@@ -12084,6 +12089,7 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
 
 	.setup_mce = vmx_setup_mce,
 
+	.smi_allowed = vmx_smi_allowed,
 	.prep_enter_smm = vmx_prep_enter_smm,
 	.post_leave_smm = vmx_post_leave_smm,
 };
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8007a6ec2e5b..5c4c49e8e660 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6434,7 +6434,7 @@ static int inject_pending_event(struct kvm_vcpu *vcpu, bool req_int_win)
 		}
 
 		kvm_x86_ops->queue_exception(vcpu);
-	} else if (vcpu->arch.smi_pending && !is_smm(vcpu)) {
+	} else if (vcpu->arch.smi_pending && !is_smm(vcpu) && kvm_x86_ops->smi_allowed(vcpu)) {
 		vcpu->arch.smi_pending = false;
 		enter_smm(vcpu);
 	} else if (vcpu->arch.nmi_pending && kvm_x86_ops->nmi_allowed(vcpu)) {
-- 
2.13.5