From: Paul Mackerras Date: Fri, 6 Sep 2013 03:23:21 +0000 (+1000) Subject: KVM: PPC: Book3S HV: Implement H_CONFER X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=42d7604d0c5a24f448983424eb19e3845cb031ba;p=linux-beck.git 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 --- 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),