KVM: nSVM: Move SMI vmexit handling to svm_check_nested_events()

Unlike VMX, SVM allows a hypervisor to take a SMI vmexit without having
any special SMM-monitor enablement sequence.  Therefore, it has to be
handled like interrupts and NMIs.  Check for an unblocked SMI in
svm_check_nested_events() so that pending SMIs are correctly prioritized
over IRQs and NMIs when the latter events will trigger VM-Exit.

Note that there is no need to test explicitly for SMI vmexits, because
guests always runs outside SMM and therefore can never get an SMI while
they are blocked.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 2828fa5..aaec6d0 100644 (file)
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -799,6 +799,15 @@ int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
        return vmexit;
 }
 
+static void nested_svm_smi(struct vcpu_svm *svm)
+{
+       svm->vmcb->control.exit_code = SVM_EXIT_SMI;
+       svm->vmcb->control.exit_info_1 = 0;
+       svm->vmcb->control.exit_info_2 = 0;
+
+       nested_svm_vmexit(svm);
+}
+
 static void nested_svm_nmi(struct vcpu_svm *svm)
 {
        svm->vmcb->control.exit_code = SVM_EXIT_NMI;
@@ -831,6 +840,13 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu)
                kvm_event_needs_reinjection(vcpu) || svm->nested.exit_required ||
                svm->nested.nested_run_pending;
 
+       if (vcpu->arch.smi_pending && nested_exit_on_smi(svm)) {
+               if (block_nested_events)
+                       return -EBUSY;
+               nested_svm_smi(svm);
+               return 0;
+       }
+
        if (vcpu->arch.nmi_pending && nested_exit_on_nmi(svm)) {
                if (block_nested_events)
                        return -EBUSY;

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c4f1846..83b8bc3 100644 (file)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3778,14 +3778,6 @@ static bool svm_smi_allowed(struct kvm_vcpu *vcpu)
        if (!gif_set(svm))
                return false;
 
-       if (is_guest_mode(&svm->vcpu) &&
-           svm->nested.intercept & (1ULL << INTERCEPT_SMI)) {
-               /* TODO: Might need to set exit_info_1 and exit_info_2 here */
-               svm->vmcb->control.exit_code = SVM_EXIT_SMI;
-               svm->nested.exit_required = true;
-               return false;
-       }
-
        return !is_smm(vcpu);
 }
 

diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index d8ae654..4dc6d2b 100644 (file)
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -378,6 +378,11 @@ static inline bool svm_nested_virtualize_tpr(struct kvm_vcpu *vcpu)
        return is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK);
 }
 
+static inline bool nested_exit_on_smi(struct vcpu_svm *svm)
+{
+       return (svm->nested.intercept & (1ULL << INTERCEPT_SMI));
+}
+
 static inline bool nested_exit_on_nmi(struct vcpu_svm *svm)
 {
        return (svm->nested.intercept & (1ULL << INTERCEPT_NMI));