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| author | Tony Krowiak <akrowiak@linux.ibm.com> | 2018-09-26 01:16:39 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2018-09-28 15:50:11 +0200 |
| commit | 37940fb0b6a2c4bf101481365c42f250694ffd15 (patch) | |
| tree | c15a6628a853bee80011324e72eb777e31a1480f /arch/s390/kvm | |
| parent | KVM: s390: vsie: allow guest FORMAT-0 CRYCB on host FORMAT-2 (diff) | |
| download | linux-37940fb0b6a2c4bf101481365c42f250694ffd15.tar.xz linux-37940fb0b6a2c4bf101481365c42f250694ffd15.zip | |
KVM: s390: device attrs to enable/disable AP interpretation
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>
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index c94ef2d0dbe4..a6230b00c1df 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -856,12 +856,11 @@ void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm) static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) { - if (!test_kvm_facility(kvm, 76)) - return -EINVAL; - mutex_lock(&kvm->lock); switch (attr->attr) { case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: + if (!test_kvm_facility(kvm, 76)) + return -EINVAL; get_random_bytes( kvm->arch.crypto.crycb->aes_wrapping_key_mask, sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); @@ -869,6 +868,8 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); break; case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: + if (!test_kvm_facility(kvm, 76)) + return -EINVAL; get_random_bytes( kvm->arch.crypto.crycb->dea_wrapping_key_mask, sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); @@ -876,17 +877,35 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); break; case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: + if (!test_kvm_facility(kvm, 76)) + return -EINVAL; kvm->arch.crypto.aes_kw = 0; memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); break; case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: + if (!test_kvm_facility(kvm, 76)) + return -EINVAL; kvm->arch.crypto.dea_kw = 0; memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); break; + case KVM_S390_VM_CRYPTO_ENABLE_APIE: + if (!ap_instructions_available()) { + mutex_unlock(&kvm->lock); + return -EOPNOTSUPP; + } + kvm->arch.crypto.apie = 1; + break; + case KVM_S390_VM_CRYPTO_DISABLE_APIE: + if (!ap_instructions_available()) { + mutex_unlock(&kvm->lock); + return -EOPNOTSUPP; + } + kvm->arch.crypto.apie = 0; + break; default: mutex_unlock(&kvm->lock); return -ENXIO; @@ -1495,6 +1514,10 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: ret = 0; break; + case KVM_S390_VM_CRYPTO_ENABLE_APIE: + case KVM_S390_VM_CRYPTO_DISABLE_APIE: + ret = ap_instructions_available() ? 0 : -ENXIO; + break; default: ret = -ENXIO; break; @@ -2601,6 +2624,7 @@ static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); + vcpu->arch.sie_block->eca &= ~ECA_APIE; if (vcpu->kvm->arch.crypto.apie) vcpu->arch.sie_block->eca |= ECA_APIE; |