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KVM: s390: device attrs to enable/disable AP interpretation

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Introduces two new VM crypto device attributes (KVM_S390_VM_CRYPTO)
to enable or disable AP instruction interpretation from userspace
via the KVM_SET_DEVICE_ATTR ioctl:

* The KVM_S390_VM_CRYPTO_ENABLE_APIE attribute enables hardware
  interpretation of AP instructions executed on the guest.

* The KVM_S390_VM_CRYPTO_DISABLE_APIE attribute disables hardware
  interpretation of AP instructions executed on the guest. In this
  case the instructions will be intercepted and pass through to
  the guest.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20180925231641.4954-25-akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Tony Krowiak
2018-09-25 19:16:39 -04:00
committed by Christian Borntraeger
parent 9ee71f20cb
commit 37940fb0b6
2 changed files with 29 additions and 3 deletions
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2
arch/s390/include/uapi/asm/kvm.h
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@@ -160,6 +160,8 @@ struct kvm_s390_vm_cpu_subfunc {
#define KVM_S390_VM_CRYPTO_ENABLE_DEA_KW 1
#define KVM_S390_VM_CRYPTO_DISABLE_AES_KW 2
#define KVM_S390_VM_CRYPTO_DISABLE_DEA_KW 3
#define KVM_S390_VM_CRYPTO_ENABLE_APIE 4
#define KVM_S390_VM_CRYPTO_DISABLE_APIE 5
/* kvm attributes for migration mode */
#define KVM_S390_VM_MIGRATION_STOP 0