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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2015-03-19 19:36:43 +0300
committerChristian Borntraeger <borntraeger@de.ibm.com>2016-06-10 13:07:13 +0300
commit15c9705f0c8af2d19dede9866aec364746b269ef (patch)
tree6db191e053d4b6ae0c9a08c75a060e6869371cae /Documentation/virtual
parentc1778e515712dae0575657fe6c9511ffcb28a7e0 (diff)
downloadlinux-15c9705f0c8af2d19dede9866aec364746b269ef.tar.xz
KVM: s390: interface to query and configure cpu features
For now, we only have an interface to query and configure facilities indicated via STFL(E). However, we also have features indicated via SCLP, that have to be indicated to the guest by user space and usually require KVM support. This patch allows user space to query and configure available cpu features for the guest. Please note that disabling a feature doesn't necessarily mean that it is completely disabled (e.g. ESOP is mostly handled by the SIE). We will try our best to disable it. Most features (e.g. SCLP) can't directly be forwarded, as most of them need in addition to hardware support, support in KVM. As we later on want to turn these features in KVM explicitly on/off (to simulate different behavior), we have to filter all features provided by the hardware and make them configurable. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/devices/vm.txt27
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