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KVM: s390: introduce AIS capability 

Introduce a cap to enable AIS facility bit, and add documentation
for this capability.

Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Signed-off-by: Fei Li <sherrylf@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
hifive-unleashed-5.1
Yi Min Zhao 2017-03-10 09:29:38 +01:00 committed by Christian Borntraeger
parent a892095013
commit 47a4693e1d
3 changed files with 24 additions and 0 deletions
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8
Documentation/virtual/kvm/api.txt
View File

@ -4110,6 +4110,14 @@ Returns: 0 on success; -EINVAL if the machine does not support
Allows use of guarded storage for the KVM guest.
7.10 KVM_CAP_S390_AIS
Architectures: s390
Parameters: none
Allow use of adapter-interruption suppression.
Returns: 0 on success; -EBUSY if a VCPU has already been created.
8. Other capabilities.
----------------------

15
arch/s390/kvm/kvm-s390.c
View File

@ -380,6 +380,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_S390_SKEYS:
case KVM_CAP_S390_IRQ_STATE:
case KVM_CAP_S390_USER_INSTR0:
case KVM_CAP_S390_AIS:
r = 1;
break;
case KVM_CAP_S390_MEM_OP:
@ -544,6 +545,20 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
r ? "(not available)" : "(success)");
break;
case KVM_CAP_S390_AIS:
mutex_lock(&kvm->lock);
if (kvm->created_vcpus) {
r = -EBUSY;
} else {
set_kvm_facility(kvm->arch.model.fac_mask, 72);
set_kvm_facility(kvm->arch.model.fac_list, 72);
kvm->arch.float_int.ais_enabled = 1;
r = 0;
}
mutex_unlock(&kvm->lock);
VM_EVENT(kvm, 3, "ENABLE: AIS %s",
r ? "(not available)" : "(success)");
break;
case KVM_CAP_S390_GS:
r = -EINVAL;
mutex_lock(&kvm->lock);

1
include/uapi/linux/kvm.h
View File

@ -884,6 +884,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_PPC_MMU_HASH_V3 135
#define KVM_CAP_IMMEDIATE_EXIT 136
#define KVM_CAP_S390_GS 137
#define KVM_CAP_S390_AIS 138
#ifdef KVM_CAP_IRQ_ROUTING