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Commit 47a4693e authored by Yi Min Zhao's avatar Yi Min Zhao Committed by Christian Borntraeger
Browse files

KVM: s390: introduce AIS capability 



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

Signed-off-by: default avatarYi Min Zhao <zyimin@linux.vnet.ibm.com>
Signed-off-by: default avatarFei Li <sherrylf@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent a8920950

Documentation/virtual/kvm/api.txt

+8 −0
Original line number Diff line number Diff line
@@ -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.

----------------------

arch/s390/kvm/kvm-s390.c

+15 −0
Original line number Diff line number Diff line
@@ -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);

include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -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