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Commit b843f065 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Document KVM_GET_MP_STATE and KVM_SET_MP_STATE 



Acked-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent df2fb6e7

Documentation/kvm/api.txt

+44 −0
Original line number Diff line number Diff line
@@ -848,6 +848,50 @@ function properly, this is the place to put them. 
       __u8  pad[64];

};



4.37 KVM_GET_MP_STATE



Capability: KVM_CAP_MP_STATE

Architectures: x86, ia64

Type: vcpu ioctl

Parameters: struct kvm_mp_state (out)

Returns: 0 on success; -1 on error



struct kvm_mp_state {

	__u32 mp_state;

};



Returns the vcpu's current "multiprocessing state" (though also valid on

uniprocessor guests).



Possible values are:



 - KVM_MP_STATE_RUNNABLE:        the vcpu is currently running

 - KVM_MP_STATE_UNINITIALIZED:   the vcpu is an application processor (AP)

                                 which has not yet received an INIT signal

 - KVM_MP_STATE_INIT_RECEIVED:   the vcpu has received an INIT signal, and is

                                 now ready for a SIPI

 - KVM_MP_STATE_HALTED:          the vcpu has executed a HLT instruction and

                                 is waiting for an interrupt

 - KVM_MP_STATE_SIPI_RECEIVED:   the vcpu has just received a SIPI (vector

                                 accesible via KVM_GET_VCPU_EVENTS)



This ioctl is only useful after KVM_CREATE_IRQCHIP.  Without an in-kernel

irqchip, the multiprocessing state must be maintained by userspace.



4.38 KVM_SET_MP_STATE



Capability: KVM_CAP_MP_STATE

Architectures: x86, ia64

Type: vcpu ioctl

Parameters: struct kvm_mp_state (in)

Returns: 0 on success; -1 on error



Sets the vcpu's current "multiprocessing state"; see KVM_GET_MP_STATE for

arguments.



This ioctl is only useful after KVM_CREATE_IRQCHIP.  Without an in-kernel

irqchip, the multiprocessing state must be maintained by userspace.



5. The kvm_run structure



Application code obtains a pointer to the kvm_run structure by