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KVM: x86: Document in-kernel PIT API

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Add descriptions for KVM_CREATE_PIT2 and KVM_GET/SET_PIT2.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2012-04-24 16:40:16 +02:00 committed by Marcelo Tosatti
parent 414fa985f9
commit 0589ff6c11
1 changed files with 63 additions and 0 deletions
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63
Documentation/virtual/kvm/api.txt
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@ -1789,6 +1789,69 @@ struct kvm_msi {
No flags are defined so far. The corresponding field must be 0. No flags are defined so far. The corresponding field must be 0.
4.71 KVM_CREATE_PIT2
Capability: KVM_CAP_PIT2
Architectures: x86
Type: vm ioctl
Parameters: struct kvm_pit_config (in)
Returns: 0 on success, -1 on error
Creates an in-kernel device model for the i8254 PIT. This call is only valid
after enabling in-kernel irqchip support via KVM_CREATE_IRQCHIP. The following
parameters have to be passed:
struct kvm_pit_config {
__u32 flags;
__u32 pad[15];
};
Valid flags are:
#define KVM_PIT_SPEAKER_DUMMY 1 /* emulate speaker port stub */
This IOCTL replaces the obsolete KVM_CREATE_PIT.
4.72 KVM_GET_PIT2
Capability: KVM_CAP_PIT_STATE2
Architectures: x86
Type: vm ioctl
Parameters: struct kvm_pit_state2 (out)
Returns: 0 on success, -1 on error
Retrieves the state of the in-kernel PIT model. Only valid after
KVM_CREATE_PIT2. The state is returned in the following structure:
struct kvm_pit_state2 {
struct kvm_pit_channel_state channels[3];
__u32 flags;
__u32 reserved[9];
};
Valid flags are:
/* disable PIT in HPET legacy mode */
#define KVM_PIT_FLAGS_HPET_LEGACY 0x00000001
This IOCTL replaces the obsolete KVM_GET_PIT.
4.73 KVM_SET_PIT2
Capability: KVM_CAP_PIT_STATE2
Architectures: x86
Type: vm ioctl
Parameters: struct kvm_pit_state2 (in)
Returns: 0 on success, -1 on error
Sets the state of the in-kernel PIT model. Only valid after KVM_CREATE_PIT2.
See KVM_GET_PIT2 for details on struct kvm_pit_state2.
This IOCTL replaces the obsolete KVM_SET_PIT.
5. The kvm_run structure 5. The kvm_run structure
------------------------ ------------------------