diff options
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 9cf899e9a5d4..b2371c0fd1f8 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -22,6 +22,7 @@ #include <linux/kvm.h> #include <linux/kvm_host.h> #include <linux/module.h> +#include <linux/random.h> #include <linux/slab.h> #include <linux/timer.h> #include <asm/asm-offsets.h> @@ -342,6 +343,53 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att return ret; } +static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); + +static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_vcpu *vcpu; + int i; + + if (!test_vfacility(76)) + return -EINVAL; + + mutex_lock(&kvm->lock); + switch (attr->attr) { + case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: + get_random_bytes( + kvm->arch.crypto.crycb->aes_wrapping_key_mask, + sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); + kvm->arch.crypto.aes_kw = 1; + break; + case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: + get_random_bytes( + kvm->arch.crypto.crycb->dea_wrapping_key_mask, + sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); + kvm->arch.crypto.dea_kw = 1; + break; + case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: + 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)); + break; + case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: + 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)); + break; + default: + mutex_unlock(&kvm->lock); + return -ENXIO; + } + + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_s390_vcpu_crypto_setup(vcpu); + exit_sie(vcpu); + } + mutex_unlock(&kvm->lock); + return 0; +} + static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) { u8 gtod_high; @@ -460,6 +508,9 @@ static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) case KVM_S390_VM_TOD: ret = kvm_s390_set_tod(kvm, attr); break; + case KVM_S390_VM_CRYPTO: + ret = kvm_s390_vm_set_crypto(kvm, attr); + break; default: ret = -ENXIO; break; @@ -515,6 +566,19 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) break; } break; + case KVM_S390_VM_CRYPTO: + switch (attr->attr) { + case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: + case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: + case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: + case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: + ret = 0; + break; + default: + ret = -ENXIO; + break; + } + break; default: ret = -ENXIO; break; @@ -602,6 +666,10 @@ static int kvm_s390_crypto_init(struct kvm *kvm) kvm->arch.crypto.crycbd = (__u32) (unsigned long) kvm->arch.crypto.crycb | CRYCB_FORMAT1; + /* Disable AES/DEA protected key functions by default */ + kvm->arch.crypto.aes_kw = 0; + kvm->arch.crypto.dea_kw = 0; + return 0; } @@ -823,6 +891,13 @@ static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) if (!test_vfacility(76)) return; + vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); + + if (vcpu->kvm->arch.crypto.aes_kw) + vcpu->arch.sie_block->ecb3 |= ECB3_AES; + if (vcpu->kvm->arch.crypto.dea_kw) + vcpu->arch.sie_block->ecb3 |= ECB3_DEA; + vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; } |