diff options
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 3677b8c..9cf899e 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -342,6 +342,113 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att return ret; } +static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) +{ + u8 gtod_high; + + if (copy_from_user(>od_high, (void __user *)attr->addr, + sizeof(gtod_high))) + return -EFAULT; + + if (gtod_high != 0) + return -EINVAL; + + return 0; +} + +static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_vcpu *cur_vcpu; + unsigned int vcpu_idx; + u64 host_tod, gtod; + int r; + + if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) + return -EFAULT; + + r = store_tod_clock(&host_tod); + if (r) + return r; + + mutex_lock(&kvm->lock); + kvm->arch.epoch = gtod - host_tod; + kvm_for_each_vcpu(vcpu_idx, cur_vcpu, kvm) { + cur_vcpu->arch.sie_block->epoch = kvm->arch.epoch; + exit_sie(cur_vcpu); + } + mutex_unlock(&kvm->lock); + return 0; +} + +static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + if (attr->flags) + return -EINVAL; + + switch (attr->attr) { + case KVM_S390_VM_TOD_HIGH: + ret = kvm_s390_set_tod_high(kvm, attr); + break; + case KVM_S390_VM_TOD_LOW: + ret = kvm_s390_set_tod_low(kvm, attr); + break; + default: + ret = -ENXIO; + break; + } + return ret; +} + +static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) +{ + u8 gtod_high = 0; + + if (copy_to_user((void __user *)attr->addr, >od_high, + sizeof(gtod_high))) + return -EFAULT; + + return 0; +} + +static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) +{ + u64 host_tod, gtod; + int r; + + r = store_tod_clock(&host_tod); + if (r) + return r; + + gtod = host_tod + kvm->arch.epoch; + if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) + return -EFAULT; + + return 0; +} + +static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) +{ + int ret; + + if (attr->flags) + return -EINVAL; + + switch (attr->attr) { + case KVM_S390_VM_TOD_HIGH: + ret = kvm_s390_get_tod_high(kvm, attr); + break; + case KVM_S390_VM_TOD_LOW: + ret = kvm_s390_get_tod_low(kvm, attr); + break; + default: + ret = -ENXIO; + break; + } + return ret; +} + static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) { int ret; @@ -350,6 +457,9 @@ static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) case KVM_S390_VM_MEM_CTRL: ret = kvm_s390_set_mem_control(kvm, attr); break; + case KVM_S390_VM_TOD: + ret = kvm_s390_set_tod(kvm, attr); + break; default: ret = -ENXIO; break; @@ -366,6 +476,9 @@ static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) case KVM_S390_VM_MEM_CTRL: ret = kvm_s390_get_mem_control(kvm, attr); break; + case KVM_S390_VM_TOD: + ret = kvm_s390_get_tod(kvm, attr); + break; default: ret = -ENXIO; break; @@ -391,6 +504,17 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) break; } break; + case KVM_S390_VM_TOD: + switch (attr->attr) { + case KVM_S390_VM_TOD_LOW: + case KVM_S390_VM_TOD_HIGH: + ret = 0; + break; + default: + ret = -ENXIO; + break; + } + break; default: ret = -ENXIO; break; @@ -541,6 +665,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) kvm->arch.css_support = 0; kvm->arch.use_irqchip = 0; + kvm->arch.epoch = 0; spin_lock_init(&kvm->arch.start_stop_lock); @@ -686,6 +811,9 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) { + mutex_lock(&vcpu->kvm->lock); + vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; + mutex_unlock(&vcpu->kvm->lock); if (!kvm_is_ucontrol(vcpu->kvm)) vcpu->arch.gmap = vcpu->kvm->arch.gmap; } |