linux-kernel - Re: [PATCH v14 3/6] KVM: s390: pv: add KVM_CAP_S390_PROTECTED_ASYNC

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Date:   Mon, 10 Oct 2022 14:15:11 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Janosch Frank <frankja@...ux.ibm.com>
Cc:     kvm@...r.kernel.org, borntraeger@...ibm.com, thuth@...hat.com,
        david@...hat.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, scgl@...ux.ibm.com,
        seiden@...ux.ibm.com, nrb@...ux.ibm.com
Subject: Re: [PATCH v14 3/6] KVM: s390: pv: add
 KVM_CAP_S390_PROTECTED_ASYNC_DISABLE

On Mon, 10 Oct 2022 13:45:54 +0200
Janosch Frank <frankja@...ux.ibm.com> wrote:

> On 9/30/22 16:01, Claudio Imbrenda wrote:
> > Add KVM_CAP_S390_PROTECTED_ASYNC_DISABLE to signal that the
> > KVM_PV_ASYNC_DISABLE and KVM_PV_ASYNC_DISABLE_PREPARE commands for the
> > KVM_S390_PV_COMMAND ioctl are available.
> > 
> > Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> > Reviewed-by: Nico Boehr <nrb@...ux.ibm.com>
> > ---
> >   arch/s390/kvm/kvm-s390.c | 3 +++
> >   include/uapi/linux/kvm.h | 1 +
> >   2 files changed, 4 insertions(+)
> > 
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index d0027964a6f5..7a3bd68efd85 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -618,6 +618,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
> >   	case KVM_CAP_S390_BPB:
> >   		r = test_facility(82);
> >   		break;
> > +	case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE:
> > +		r = async_destroy && is_prot_virt_host();
> > +		break;
> >   	case KVM_CAP_S390_PROTECTED:
> >   		r = is_prot_virt_host();
> >   		break;
> > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> > index 02602c5c1975..9afe0084b2c5 100644
> > --- a/include/uapi/linux/kvm.h
> > +++ b/include/uapi/linux/kvm.h
> > @@ -1177,6 +1177,7 @@ struct kvm_ppc_resize_hpt {
> >   #define KVM_CAP_VM_DISABLE_NX_HUGE_PAGES 220
> >   #define KVM_CAP_S390_ZPCI_OP 221
> >   #define KVM_CAP_S390_CPU_TOPOLOGY 222
> > +#define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 225  
> 
> I can see 223 in Paolo's next, is there a 224 that I've missed?

no, I set this to an arbitrarily high value to avoid conficts

seems like I got it more or less right :)

feel free to change the value of the macro when merging, so it's
contiguous.

> 
> 
> >   
> >   #ifdef KVM_CAP_IRQ_ROUTING
> >     
>