diff options
| -rw-r--r-- | Documentation/virt/kvm/devices/vm.rst | 3 | ||||
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 26 | ||||
| -rw-r--r-- | arch/s390/kvm/kvm-s390.h | 1 |
3 files changed, 20 insertions, 10 deletions
diff --git a/Documentation/virt/kvm/devices/vm.rst b/Documentation/virt/kvm/devices/vm.rst index 0aa5b1cfd700..60acc39e0e93 100644 --- a/Documentation/virt/kvm/devices/vm.rst +++ b/Documentation/virt/kvm/devices/vm.rst @@ -215,6 +215,7 @@ KVM_S390_VM_TOD_EXT). :Parameters: address of a buffer in user space to store the data (u8) to :Returns: -EFAULT if the given address is not accessible from kernel space; -EINVAL if setting the TOD clock extension to != 0 is not supported + -EOPNOTSUPP for a PV guest (TOD managed by the ultravisor) 3.2. ATTRIBUTE: KVM_S390_VM_TOD_LOW ----------------------------------- @@ -224,6 +225,7 @@ the POP (u64). :Parameters: address of a buffer in user space to store the data (u64) to :Returns: -EFAULT if the given address is not accessible from kernel space + -EOPNOTSUPP for a PV guest (TOD managed by the ultravisor) 3.3. ATTRIBUTE: KVM_S390_VM_TOD_EXT ----------------------------------- @@ -237,6 +239,7 @@ it, it is stored as 0 and not allowed to be set to a value != 0. (kvm_s390_vm_tod_clock) to :Returns: -EFAULT if the given address is not accessible from kernel space; -EINVAL if setting the TOD clock extension to != 0 is not supported + -EOPNOTSUPP for a PV guest (TOD managed by the ultravisor) 4. GROUP: KVM_S390_VM_CRYPTO ============================ diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 45d4b8182b07..bc491a73815c 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1207,6 +1207,8 @@ static int kvm_s390_vm_get_migration(struct kvm *kvm, return 0; } +static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod); + static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) { struct kvm_s390_vm_tod_clock gtod; @@ -1216,7 +1218,7 @@ static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx) return -EINVAL; - kvm_s390_set_tod_clock(kvm, >od); + __kvm_s390_set_tod_clock(kvm, >od); VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx", gtod.epoch_idx, gtod.tod); @@ -1247,7 +1249,7 @@ static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) sizeof(gtod.tod))) return -EFAULT; - kvm_s390_set_tod_clock(kvm, >od); + __kvm_s390_set_tod_clock(kvm, >od); VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod); return 0; } @@ -1259,6 +1261,16 @@ static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) if (attr->flags) return -EINVAL; + mutex_lock(&kvm->lock); + /* + * For protected guests, the TOD is managed by the ultravisor, so trying + * to change it will never bring the expected results. + */ + if (kvm_s390_pv_is_protected(kvm)) { + ret = -EOPNOTSUPP; + goto out_unlock; + } + switch (attr->attr) { case KVM_S390_VM_TOD_EXT: ret = kvm_s390_set_tod_ext(kvm, attr); @@ -1273,6 +1285,9 @@ static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) ret = -ENXIO; break; } + +out_unlock: + mutex_unlock(&kvm->lock); return ret; } @@ -4377,13 +4392,6 @@ static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_t preempt_enable(); } -void kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) -{ - mutex_lock(&kvm->lock); - __kvm_s390_set_tod_clock(kvm, gtod); - mutex_unlock(&kvm->lock); -} - int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) { if (!mutex_trylock(&kvm->lock)) diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index f6fd668f887e..4755492dfabc 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -363,7 +363,6 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu); int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu); /* implemented in kvm-s390.c */ -void kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod); int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod); long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable); int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr); |