From 42d7604d0c5a24f448983424eb19e3845cb031ba Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Fri, 6 Sep 2013 13:23:21 +1000 Subject: [PATCH] KVM: PPC: Book3S HV: Implement H_CONFER 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 Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_hv.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 56f57af7e738..a010aa4cd026 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -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), -- 2.20.1