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Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 110484915aa0..335fe889efd9 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -3092,6 +3092,30 @@ of IOMMU pages. The rest of functionality is identical to KVM_CREATE_SPAPR_TCE. +4.98 KVM_REINJECT_CONTROL + +Capability: KVM_CAP_REINJECT_CONTROL +Architectures: x86 +Type: vm ioctl +Parameters: struct kvm_reinject_control (in) +Returns: 0 on success, + -EFAULT if struct kvm_reinject_control cannot be read, + -ENXIO if KVM_CREATE_PIT or KVM_CREATE_PIT2 didn't succeed earlier. + +i8254 (PIT) has two modes, reinject and !reinject. The default is reinject, +where KVM queues elapsed i8254 ticks and monitors completion of interrupt from +vector(s) that i8254 injects. Reinject mode dequeues a tick and injects its +interrupt whenever there isn't a pending interrupt from i8254. +!reinject mode injects an interrupt as soon as a tick arrives. + +struct kvm_reinject_control { + __u8 pit_reinject; + __u8 reserved[31]; +}; + +pit_reinject = 0 (!reinject mode) is recommended, unless running an old +operating system that uses the PIT for timing (e.g. Linux 2.4.x). + 5. The kvm_run structure ------------------------ |