Re: [Qemu-devel] [PATCH 08/10] xics: Handle KVM interrupt presentation from "simple" ICS code

[Greg Kurz <groug@kaod.org>]

On Fri, 15 Feb 2019 13:59:36 +0100
Cédric Le Goater <clg@kaod.org> wrote:

> On 2/15/19 12:40 PM, Greg Kurz wrote:
> > We want to use the "simple" ICS type in both KVM and non-KVM setups.
> > Teach the "simple" ICS how to present interrupts to KVM and adapt
> > sPAPR accordingly.  
> 
> I don't see the benefits of this change.
> 

Consistency with what the rest of the series actually does: hiding the
KVM details under XICS. But I agree it doesn't buy anything more so
I don't mind if it is dropped.

> C.
> 
> 
> > Signed-off-by: Greg Kurz <groug@kaod.org>
> > ---
> >  hw/intc/xics.c        |    5 +++++
> >  hw/intc/xics_kvm.c    |    3 +--
> >  hw/ppc/spapr_irq.c    |    7 +------
> >  include/hw/ppc/xics.h |    2 +-
> >  4 files changed, 8 insertions(+), 9 deletions(-)
> > 
> > diff --git a/hw/intc/xics.c b/hw/intc/xics.c
> > index 49401745c410..3009fa747277 100644
> > --- a/hw/intc/xics.c
> > +++ b/hw/intc/xics.c
> > @@ -466,6 +466,11 @@ void ics_simple_set_irq(void *opaque, int srcno, int val)
> >  {
> >      ICSState *ics = (ICSState *)opaque;
> >  
> > +    if (kvm_irqchip_in_kernel()) {
> > +        ics_kvm_set_irq(ics, srcno, val);
> > +        return;
> > +    }
> > +
> >      if (ics->irqs[srcno].flags & XICS_FLAGS_IRQ_LSI) {
> >          ics_simple_set_irq_lsi(ics, srcno, val);
> >      } else {
> > diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
> > index e7b8d4c29ce6..f34eacda03e7 100644
> > --- a/hw/intc/xics_kvm.c
> > +++ b/hw/intc/xics_kvm.c
> > @@ -259,9 +259,8 @@ int ics_set_kvm_state(ICSState *ics)
> >      return 0;
> >  }
> >  
> > -void ics_kvm_set_irq(void *opaque, int srcno, int val)
> > +void ics_kvm_set_irq(ICSState *ics, int srcno, int val)
> >  {
> > -    ICSState *ics = opaque;
> >      struct kvm_irq_level args;
> >      int rc;
> >  
> > diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
> > index e6893df61e76..9f43b7b3bf16 100644
> > --- a/hw/ppc/spapr_irq.c
> > +++ b/hw/ppc/spapr_irq.c
> > @@ -222,13 +222,8 @@ static int spapr_irq_post_load_xics(sPAPRMachineState *spapr, int version_id)
> >  static void spapr_irq_set_irq_xics(void *opaque, int srcno, int val)
> >  {
> >      sPAPRMachineState *spapr = opaque;
> > -    MachineState *machine = MACHINE(opaque);
> >  
> > -    if (kvm_enabled() && machine_kernel_irqchip_allowed(machine)) {
> > -        ics_kvm_set_irq(spapr->ics, srcno, val);
> > -    } else {
> > -        ics_simple_set_irq(spapr->ics, srcno, val);
> > -    }
> > +    ics_simple_set_irq(spapr->ics, srcno, val);
> >  }
> >  
> >  static void spapr_irq_reset_xics(sPAPRMachineState *spapr, Error **errp)
> > diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
> > index 06e87128f88e..61bd0fb9784f 100644
> > --- a/include/hw/ppc/xics.h
> > +++ b/include/hw/ppc/xics.h
> > @@ -180,7 +180,6 @@ void icp_eoi(ICPState *icp, uint32_t xirr);
> >  void ics_simple_write_xive(ICSState *ics, int nr, int server,
> >                             uint8_t priority, uint8_t saved_priority);
> >  void ics_simple_set_irq(void *opaque, int srcno, int val);
> > -void ics_kvm_set_irq(void *opaque, int srcno, int val);
> >  
> >  void ics_set_irq_type(ICSState *ics, int srcno, bool lsi);
> >  void icp_pic_print_info(ICPState *icp, Monitor *mon);
> > @@ -201,5 +200,6 @@ void icp_kvm_realize(DeviceState *dev, Error **errp);
> >  void ics_get_kvm_state(ICSState *ics);
> >  int ics_set_kvm_state(ICSState *ics);
> >  void ics_synchronize_state(ICSState *ics);
> > +void ics_kvm_set_irq(ICSState *ics, int srcno, int val);
> >  
> >  #endif /* XICS_H */
> >   
>