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Re: [Qemu-devel] [PATCH v2 1/7] s390/kvm: Support for I/O interrupts.


From: Cornelia Huck
Subject: Re: [Qemu-devel] [PATCH v2 1/7] s390/kvm: Support for I/O interrupts.
Date: Wed, 5 Sep 2012 10:26:00 +0200

On Wed, 05 Sep 2012 10:28:53 +0300
Avi Kivity <address@hidden> wrote:

> On 09/04/2012 06:13 PM, Cornelia Huck wrote:
> > Add support for handling I/O interrupts (standard, subchannel-related
> > ones and rudimentary adapter interrupts).
> > 
> > The subchannel-identifying parameters are encoded into the interrupt
> > type.
> > 
> > I/O interrupts are floating, so they can't be injected on a specific
> > vcpu.
> > 
> > diff --git a/include/linux/kvm.h b/include/linux/kvm.h
> > index d808694..5a36e65 100644
> > --- a/include/linux/kvm.h
> > +++ b/include/linux/kvm.h
> > @@ -396,6 +396,12 @@ struct kvm_s390_psw {
> >  #define KVM_S390_INT_SERVICE               0xffff2401u
> >  #define KVM_S390_INT_EMERGENCY             0xffff1201u
> >  #define KVM_S390_INT_EXTERNAL_CALL 0xffff1202u
> > +#define KVM_S390_INT_IO(ai,cssid,ssid,schid)   \
> > +   (((schid)) |                           \
> > +    ((ssid) << 16) |                      \
> > +    ((cssid) << 18) |                     \
> > +    ((ai) << 26))
> > +
> >  
> 
> Documentation?
> 

KVM_S390_INTERRUPT is currently completely undocumented... I'll
probably do an extra patch and then have this and the machine check
patch add the new values.




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