KVM: zero output of KVM_GET_VCPU_EVENTS before filling in the struct

This allows making some fields optional, as will be the case soon
for SMM-related data.

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

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 73c3203..84aa516 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5057,16 +5057,15 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
            ex->pending && ex->has_payload)
                kvm_deliver_exception_payload(vcpu, ex);
 
+       memset(events, 0, sizeof(*events));
+
        /*
         * The API doesn't provide the instruction length for software
         * exceptions, so don't report them. As long as the guest RIP
         * isn't advanced, we should expect to encounter the exception
         * again.
         */
-       if (kvm_exception_is_soft(ex->vector)) {
-               events->exception.injected = 0;
-               events->exception.pending = 0;
-       } else {
+       if (!kvm_exception_is_soft(ex->vector)) {
                events->exception.injected = ex->injected;
                events->exception.pending = ex->pending;
                /*
@@ -5086,15 +5085,13 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
        events->interrupt.injected =
                vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft;
        events->interrupt.nr = vcpu->arch.interrupt.nr;
-       events->interrupt.soft = 0;
        events->interrupt.shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu);
 
        events->nmi.injected = vcpu->arch.nmi_injected;
        events->nmi.pending = vcpu->arch.nmi_pending != 0;
        events->nmi.masked = static_call(kvm_x86_get_nmi_mask)(vcpu);
-       events->nmi.pad = 0;
 
-       events->sipi_vector = 0; /* never valid when reporting to user space */
+       /* events->sipi_vector is never valid when reporting to user space */
 
        events->smi.smm = is_smm(vcpu);
        events->smi.pending = vcpu->arch.smi_pending;
@@ -5111,8 +5108,6 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
                events->triple_fault.pending = kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu);
                events->flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT;
        }
-
-       memset(&events->reserved, 0, sizeof(events->reserved));
 }
 
 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,