lkml.org 
[lkml]   [2022]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [PATCH v2 29/30] KVM: s390: introduce CPU feature for zPCI Interpretation
    From


    On 1/14/22 21:31, Matthew Rosato wrote:
    > KVM_S390_VM_CPU_FEAT_ZPCI_INTERP relays whether zPCI interpretive
    > execution is possible based on the available hardware facilities.
    >
    > Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
    > ---
    > arch/s390/include/uapi/asm/kvm.h | 1 +
    > arch/s390/kvm/kvm-s390.c | 4 ++++
    > 2 files changed, 5 insertions(+)
    >
    > diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
    > index 7a6b14874d65..ed06458a871f 100644
    > --- a/arch/s390/include/uapi/asm/kvm.h
    > +++ b/arch/s390/include/uapi/asm/kvm.h
    > @@ -130,6 +130,7 @@ struct kvm_s390_vm_cpu_machine {
    > #define KVM_S390_VM_CPU_FEAT_PFMFI 11
    > #define KVM_S390_VM_CPU_FEAT_SIGPIF 12
    > #define KVM_S390_VM_CPU_FEAT_KSS 13
    > +#define KVM_S390_VM_CPU_FEAT_ZPCI_INTERP 14
    > struct kvm_s390_vm_cpu_feat {
    > __u64 feat[16];
    > };
    > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
    > index b6c32fc3b272..3ed59fe512dd 100644
    > --- a/arch/s390/kvm/kvm-s390.c
    > +++ b/arch/s390/kvm/kvm-s390.c
    > @@ -434,6 +434,10 @@ static void kvm_s390_cpu_feat_init(void)
    > if (test_facility(151)) /* DFLTCC */
    > __insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);
    >
    > + if (test_facility(69) && test_facility(70) && test_facility(71) &&
    > + test_facility(72)) /* zPCI Interpretation */
    > + allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ZPCI_INTERP);
    > +

    Don't we want to start the support of ZPCI interpretation starting with
    Z14 ?

    > if (MACHINE_HAS_ESOP)
    > allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
    > /*
    >

    --
    Pierre Morel
    IBM Lab Boeblingen

    \
     
     \ /
      Last update: 2022-01-19 14:38    [W:2.711 / U:0.232 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site