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authorJan Kiszka <jan.kiszka@siemens.com>2012-04-24 18:40:16 +0400
committerMarcelo Tosatti <mtosatti@redhat.com>2012-04-28 02:40:29 +0400
commit0589ff6c11d8128cf053c3ddc75b0f6d8b71c62b (patch)
treea83f052199ead693e8aa1299100e2f0da168d982 /Documentation/virtual
parent414fa985f91bdf61fe2baf8111c0ddbdb94808ea (diff)
downloadlinux-0589ff6c11d8128cf053c3ddc75b0f6d8b71c62b.tar.xz
KVM: x86: Document in-kernel PIT API
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>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt63
1 files changed, 63 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index b48f92786ab3..a7cb93cb2154 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1789,6 +1789,69 @@ struct kvm_msi {
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
------------------------