Re: [PATCH v9 4/4] s390: ap: kvm: Enable PQAP/AQIC facility for the guest

Halil Pasic
2019-06-27T12:04:29Z

On Tue, 25 Jun 2019 22:13:12 +0200
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

>
>
> On 21.05.19 17:34, Pierre Morel wrote:
> > AP Queue Interruption Control (AQIC) facility gives
> > the guest the possibility to control interruption for
> > the Cryptographic Adjunct Processor queues.
> >
> > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> > Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
> > ---
> > arch/s390/tools/gen_facilities.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/s390/tools/gen_facilities.c b/arch/s390/tools/gen_facilities.c
> > index 61ce5b5..aed14fc 100644
> > --- a/arch/s390/tools/gen_facilities.c
> > +++ b/arch/s390/tools/gen_facilities.c
> > @@ -114,6 +114,7 @@ static struct facility_def facility_defs[] = {
> > .bits = (int[]){
> > 12, /* AP Query Configuration Information */
> > 15, /* AP Facilities Test */
> > + 65, /* AP Queue Interruption Control */
> > 156, /* etoken facility */
> > -1 /* END */
> > }
> >
>
> I think we should only set stfle.65 if we have the aiv facility (Because we do not
> have a GISA otherwise)
>
> So something like this instead?
>
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 28ebd64..1501cd6 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -2461,6 +2461,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
> set_kvm_facility(kvm->arch.model.fac_list, 147);
> }
>
> + if (css_general_characteristics.aiv)
> + set_kvm_facility(kvm->arch.model.fac_mask, 65);
> +
> kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
> kvm->arch.model.ibc = sclp.ibc & 0x0fff;

I will go with this option because it is more readable (easier to find)
IMHO. Will also add a chech for host sltfle.65. So I end up with:

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 28ebd647784c..1c4113f0f2a8 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2461,6 +2461,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
set_kvm_facility(kvm->arch.model.fac_list, 147);
}

+ if (css_general_characteristics.aiv && test_facility(65))
+ set_kvm_facility(kvm->arch.model.fac_mask, 65);
+
kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
kvm->arch.model.ibc = sclp.ibc & 0x0fff;

diff --git a/arch/s390/tools/gen_facilities.c b/arch/s390/tools/gen_facilities.c
index d52f537b7169..cead9e0dcffb 100644
--- a/arch/s390/tools/gen_facilities.c
+++ b/arch/s390/tools/gen_facilities.c
@@ -111,7 +111,6 @@ static struct facility_def facility_defs[] = {
.bits = (int[]){
12, /* AP Query Configuration Information */
15, /* AP Facilities Test */
- 65, /* AP Queue Interruption Control */
156, /* etoken facility */
-1 /* END */