Re: [Qemu-devel] [PATCH RFC v2 3/9] s390x: chsc nt2 events are pci-only

[Thomas Huth <thuth@redhat.com>]

On 18.07.2017 16:24, Cornelia Huck wrote:
> The nt2 event class is pci-only - don't look for events if pci is
> not in the active cpu model.
> 
> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
> ---
>  hw/s390x/s390-pci-bus.c  |  4 ++--
>  hw/s390x/s390-pci-bus.h  |  4 ++--
>  hw/s390x/s390-pci-stub.c |  4 ++--
>  target/s390x/ioinst.c    | 16 ++++++++++++++++
>  4 files changed, 22 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
> index 61cfd2138f..c57f6ebae0 100644
> --- a/hw/s390x/s390-pci-bus.c
> +++ b/hw/s390x/s390-pci-bus.c
> @@ -47,7 +47,7 @@ S390pciState *s390_get_phb(void)
>      return phb;
>  }
>  
> -int chsc_sei_nt2_get_event(void *res)
> +int pci_chsc_sei_nt2_get_event(void *res)
>  {
>      ChscSeiNt2Res *nt2_res = (ChscSeiNt2Res *)res;
>      PciCcdfAvail *accdf;
> @@ -87,7 +87,7 @@ int chsc_sei_nt2_get_event(void *res)
>      return rc;
>  }
>  
> -int chsc_sei_nt2_have_event(void)
> +int pci_chsc_sei_nt2_have_event(void)
>  {
>      S390pciState *s = s390_get_phb();
>  
> diff --git a/hw/s390x/s390-pci-bus.h b/hw/s390x/s390-pci-bus.h
> index 67af2c12ff..5df6292509 100644
> --- a/hw/s390x/s390-pci-bus.h
> +++ b/hw/s390x/s390-pci-bus.h
> @@ -319,8 +319,8 @@ typedef struct S390pciState {
>  } S390pciState;
>  
>  S390pciState *s390_get_phb(void);
> -int chsc_sei_nt2_get_event(void *res);
> -int chsc_sei_nt2_have_event(void);
> +int pci_chsc_sei_nt2_get_event(void *res);
> +int pci_chsc_sei_nt2_have_event(void);
>  void s390_pci_sclp_configure(SCCB *sccb);
>  void s390_pci_sclp_deconfigure(SCCB *sccb);
>  void s390_pci_iommu_enable(S390PCIIOMMU *iommu);
> diff --git a/hw/s390x/s390-pci-stub.c b/hw/s390x/s390-pci-stub.c
> index 2e7e42a2af..cc7278a865 100644
> --- a/hw/s390x/s390-pci-stub.c
> +++ b/hw/s390x/s390-pci-stub.c
> @@ -7,12 +7,12 @@
>  #include "s390-pci-bus.h"
>  
>  /* target/s390x/ioinst.c */
> -int chsc_sei_nt2_get_event(void *res)
> +int pci_chsc_sei_nt2_get_event(void *res)
>  {
>      return 1;
>  }
>  
> -int chsc_sei_nt2_have_event(void)
> +int pci_chsc_sei_nt2_have_event(void)
>  {
>      return 0;
>  }
> diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c
> index d5e6b8066b..a9e5b13292 100644
> --- a/target/s390x/ioinst.c
> +++ b/target/s390x/ioinst.c
> @@ -599,6 +599,22 @@ static int chsc_sei_nt0_have_event(void)
>      return 0;
>  }
>  
> +static int chsc_sei_nt2_get_event(void *res)
> +{
> +    if (s390_has_feat(S390_FEAT_ZPCI)) {
> +        return pci_chsc_sei_nt2_get_event(res);
> +    }
> +    return 1;
> +}
> +
> +static int chsc_sei_nt2_have_event(void)
> +{
> +    if (s390_has_feat(S390_FEAT_ZPCI)) {
> +        return pci_chsc_sei_nt2_have_event();
> +    }
> +    return 0;
> +}

Hmm, since you're having wrapper functions for these now anyway, I
wonder whether it would be more elegant to make
pci_chsc_sei_nt2_get_event() and pci_chsc_sei_nt2_have_event() function
pointers in the S390pciState object instead. Then you could do something
like:

static int chsc_sei_nt2_have_event(void)
{
    S390pciState *ps = s390_get_phb();

    if (s390_has_feat(S390_FEAT_ZPCI) && ps != NULL) {
        return ps->pci_chsc_sei_nt2_have_event();
    }
    return 0;
}

and you would not need the stubs in pci-stubs.c anymore?

 Thomas