Re: [Qemu-devel] [PATCH v1 for-2-12 06/15] s390x/flic: factor out injection of floating interrupts

[Cornelia Huck <cohuck@redhat.com>]

On Mon, 11 Dec 2017 14:47:31 +0100
David Hildenbrand <david@redhat.com> wrote:

> Let the flic device handle it internally. This will allow us to later
> on store floating interrupts in the flic for the TCG case.
> 
> This now also simplifies kvm.c. All that's left is the fallback
> interface for floating interrupts, which is no triggered directly via

s/no/now/

> the flic in case anything goes wrong.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  hw/intc/s390_flic.c          | 31 ++++++++++++++++++++
>  hw/intc/s390_flic_kvm.c      | 63 ++++++++++++++++++++++++++++++++++++----
>  include/hw/s390x/s390_flic.h |  5 ++++
>  target/s390x/cpu.h           |  7 ++++-
>  target/s390x/interrupt.c     | 42 +++++++++++----------------
>  target/s390x/kvm-stub.c      | 13 ---------
>  target/s390x/kvm.c           | 68 ++++----------------------------------------
>  target/s390x/kvm_s390x.h     | 10 +------
>  8 files changed, 123 insertions(+), 116 deletions(-)
> 
> diff --git a/hw/intc/s390_flic.c b/hw/intc/s390_flic.c
> index a78bdf1d90..8d521c415a 100644
> --- a/hw/intc/s390_flic.c
> +++ b/hw/intc/s390_flic.c
> @@ -131,6 +131,34 @@ static int qemu_s390_inject_airq(S390FLICState *fs, uint8_t type,
>      return 0;
>  }
>  
> +static void qemu_s390_inject_service(S390FLICState *fs, uint32_t parm)
> +{
> +
> +    S390CPU *dummy_cpu = s390_cpu_addr2state(0);
> +
> +    /* FIXME: don't inject into dummy CPU */
> +    cpu_inject_service(dummy_cpu, parm);
> +}
> +
> +static void qemu_s390_inject_io(S390FLICState *fs, uint16_t subchannel_id,
> +                                uint16_t subchannel_nr, uint32_t io_int_parm,
> +                                uint32_t io_int_word)
> +{
> +    S390CPU *dummy_cpu = s390_cpu_addr2state(0);
> +
> +    /* FIXME: don't inject into dummy CPU */
> +    cpu_inject_io(dummy_cpu, subchannel_id, subchannel_nr, io_int_parm,
> +                  io_int_word);
> +}
> +
> +static void qemu_s390_inject_crw_mchk(S390FLICState *fs)
> +{
> +    S390CPU *dummy_cpu = s390_cpu_addr2state(0);
> +
> +    /* FIXME: don't inject into dummy CPU */
> +    cpu_inject_crw_mchk(dummy_cpu);
> +}
> +
>  static void qemu_s390_flic_reset(DeviceState *dev)
>  {
>      QEMUS390FLICState *flic = QEMU_S390_FLIC(dev);
> @@ -172,6 +200,9 @@ static void qemu_s390_flic_class_init(ObjectClass *oc, void *data)
>      fsc->clear_io_irq = qemu_s390_clear_io_flic;
>      fsc->modify_ais_mode = qemu_s390_modify_ais_mode;
>      fsc->inject_airq = qemu_s390_inject_airq;
> +    fsc->inject_service = qemu_s390_inject_service;
> +    fsc->inject_io = qemu_s390_inject_io;
> +    fsc->inject_crw_mchk = qemu_s390_inject_crw_mchk;
>  }

As you now have a callback for ->inject_io(), make
qemu_s390_inject_airq() invoke it directly instead of going the detour
through s390_io_interrupt()?

>  
>  static Property s390_flic_common_properties[] = {

(...)

Generally looks sane.

One thing I noticed: You removed the caching of the flic (in the old
kvm inject routine), and you generally do more qom invocations (first,
to find the common flic; then, to translate to the qemu or kvm flic).
Not sure if this might be a problem (probably not).