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KVM: PPC: Book3S HV: Implement H_CONFER

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The H_CONFER hypercall is used when a guest vcpu is spinning on a lock
held by another vcpu which has been preempted, and the spinning vcpu
wishes to give its timeslice to the lock holder.  We implement this
in the straightforward way using kvm_vcpu_yield_to().

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Paul Mackerras 2013-09-06 13:23:21 +10:00 committed by Alexander Graf
parent c0867fd509
commit 42d7604d0c
1 changed files with 9 additions and 0 deletions
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9
arch/powerpc/kvm/book3s_hv.c
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@ -538,6 +538,15 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
}
break;
case H_CONFER:
target = kvmppc_get_gpr(vcpu, 4);
if (target == -1)
break;
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
kvm_vcpu_yield_to(tvcpu);
break;
case H_REGISTER_VPA:
ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),