diff options
Diffstat (limited to 'Documentation/virtual/kvm/devices/vm.txt')
| -rw-r--r-- | Documentation/virtual/kvm/devices/vm.txt | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/vm.txt b/Documentation/virtual/kvm/devices/vm.txt index a9ea8774a45f..0ed6808b9965 100644 --- a/Documentation/virtual/kvm/devices/vm.txt +++ b/Documentation/virtual/kvm/devices/vm.txt @@ -85,6 +85,33 @@ Returns: -EBUSY in case 1 or more vcpus are already activated (only in write -ENOMEM if not enough memory is available to process the ioctl 0 in case of success +2.3. ATTRIBUTE: KVM_S390_VM_CPU_MACHINE_FEAT (r/o) + +Allows user space to retrieve available cpu features. A feature is available if +provided by the hardware and supported by kvm. In theory, cpu features could +even be completely emulated by kvm. + +struct kvm_s390_vm_cpu_feat { + __u64 feat[16]; # Bitmap (1 = feature available), MSB 0 bit numbering +}; + +Parameters: address of a buffer to load the feature list from. +Returns: -EFAULT if the given address is not accessible from kernel space. + 0 in case of success. + +2.4. ATTRIBUTE: KVM_S390_VM_CPU_PROCESSOR_FEAT (r/w) + +Allows user space to retrieve or change enabled cpu features for all VCPUs of a +VM. Features that are not available cannot be enabled. + +See 2.3. for a description of the parameter struct. + +Parameters: address of a buffer to store/load the feature list from. +Returns: -EFAULT if the given address is not accessible from kernel space. + -EINVAL if a cpu feature that is not available is to be enabled. + -EBUSY if at least one VCPU has already been defined. + 0 in case of success. + 3. GROUP: KVM_S390_VM_TOD Architectures: s390 |