| Message ID | 20130906032321.GH29710@iris.ozlabs.ibm.com |
|---|---|
| State | New, archived |
| Headers | show |
On 05.09.2013, at 22:23, Paul Mackerras wrote: > 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> Thanks, applied to kvm-ppc-queue. Alex -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 1a10afa..0bb23a9 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -567,6 +567,15 @@ 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),
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> --- arch/powerpc/kvm/book3s_hv.c | 9 +++++++++ 1 file changed, 9 insertions(+)