Re: [Qemu-devel] [PATCH 1/2] s390x/migration: use zero flag parameter

[Cornelia Huck <cohuck@redhat.com>]

On Mon, 20 Nov 2017 13:35:24 +0100
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> valgrind pointed out that we call KVM_S390_GET_IRQ_STATE with an
> undefined value for flags. Right now this is unused, but we
> better play safe.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
>  target/s390x/kvm.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
> index 343fcec..b0439a1 100644
> --- a/target/s390x/kvm.c
> +++ b/target/s390x/kvm.c
> @@ -2069,7 +2069,10 @@ int kvm_s390_set_cpu_state(S390CPU *cpu, uint8_t cpu_state)
>  
>  void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
>  {
> -    struct kvm_s390_irq_state irq_state;
> +    struct kvm_s390_irq_state irq_state = {
> +        .buf = (uint64_t) cpu->irqstate,
> +        .len = VCPU_IRQ_BUF_SIZE,
> +    };
>      CPUState *cs = CPU(cpu);
>      int32_t bytes;
>  
> @@ -2077,9 +2080,6 @@ void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
>          return;
>      }
>  
> -    irq_state.buf = (uint64_t) cpu->irqstate;
> -    irq_state.len = VCPU_IRQ_BUF_SIZE;
> -
>      bytes = kvm_vcpu_ioctl(cs, KVM_S390_GET_IRQ_STATE, &irq_state);
>      if (bytes < 0) {
>          cpu->irqstate_saved_size = 0;

I'm wondering why it does not also complain for KVM_S390_SET_IRQ_STATE?
It would make sense to use a struct initializer there as well.