Re: [PATCH v5 20/21] KVM: s390: introduce CPU feature for zPCI Interpretation

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On 4/4/22 19:43, 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@xxxxxxxxxxxxx>
---
  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 65a53e22f686..d6988bd22df8 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -433,6 +433,10 @@ static void kvm_s390_cpu_feat_init(void)
  	if (test_facility(151)) /* DFLTCC */
  		__insn32_query(INSN_DFLTCC, kvm_s390_available_subfunc.dfltcc);
+ /* zPCI Interpretation */
+	if (kvm_s390_pci_interp_allowed())
+		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ZPCI_INTERP);
+
  	if (MACHINE_HAS_ESOP)
  		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
  	/*


Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>

--
Pierre Morel
IBM Lab Boeblingen



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