From: Tony Krowiak <akrow...@linux.ibm.com> Let's use the KVM_SET_DEVICE_ATTR ioctl to enable or disable hardware interpretation of AP instructions executed on the guest. If the S390_FEAT_AP feature is installed, AP instructions will be interpreted by default; otherwise, they will be intercepted. This attribute setting may be overridden by a device. For example, a device may want to provide AP instructions to the guest (i.e., S390_FEAT_AP turned on), but it may want to emulate them. In this case, the AP instructions executed on the guest must be intercepted; so when the device is realized, it must disable interpretation.
Signed-off-by: Tony Krowiak <akrow...@linux.ibm.com> --- target/s390x/kvm.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c index c4bd84d..28a3900 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -2297,6 +2297,19 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp) S390_FEAT_MAX); } +static void kvm_s390_configure_apie(int interpret) +{ + uint64_t attr = KVM_S390_VM_CRYPTO_DISABLE_APIE; + + if (interpret) { + attr = KVM_S390_VM_CRYPTO_ENABLE_APIE; + } + + if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) { + kvm_s390_set_attr(attr); + } +} + void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp) { struct kvm_s390_vm_cpu_processor prop = { @@ -2346,6 +2359,9 @@ void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp) if (test_bit(S390_FEAT_CMM, model->features)) { kvm_s390_enable_cmma(); } + + /* configure hardware interpretation of AP instructions */ + kvm_s390_configure_apie(test_bit(S390_FEAT_AP, model->features)); } void kvm_s390_restart_interrupt(S390CPU *cpu) -- 1.7.1