On 25.04.2012, at 15:30, Christian Borntraeger wrote: > From: Konstantin Weitz <[email protected]> > > This patch implements the directed yield hypercall found on other > System z hypervisors. It delegates execution time to the virtual cpu > specified in the instruction's parameter. > > Useful to avoid long spinlock waits in the guest. > > Christian Borntraeger: moved common code in virt/kvm/ > > Signed-off-by: Konstantin Weitz <[email protected]> > Signed-off-by: Christian Borntraeger <[email protected]> > --- > arch/s390/include/asm/kvm_host.h | 1 + > arch/s390/kvm/diag.c | 25 +++++++++++++++++++++++ > arch/s390/kvm/kvm-s390.c | 1 + > include/linux/kvm_host.h | 1 + > virt/kvm/kvm_main.c | 42 +++++++++++++++++++++++--------------- > 5 files changed, 54 insertions(+), 16 deletions(-) > > diff --git a/arch/s390/include/asm/kvm_host.h > b/arch/s390/include/asm/kvm_host.h > index 7343872..dd17537 100644 > --- a/arch/s390/include/asm/kvm_host.h > +++ b/arch/s390/include/asm/kvm_host.h > @@ -148,6 +148,7 @@ struct kvm_vcpu_stat { > u32 instruction_sigp_restart; > u32 diagnose_10; > u32 diagnose_44; > + u32 diagnose_9c; > }; > > struct kvm_s390_io_info { > diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c > index a353f0e..2d2ae32 100644 > --- a/arch/s390/kvm/diag.c > +++ b/arch/s390/kvm/diag.c > @@ -53,6 +53,29 @@ static int __diag_time_slice_end(struct kvm_vcpu *vcpu) > return 0; > } > > +static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu) > +{ > + struct kvm *kvm = vcpu->kvm; > + struct kvm_vcpu *tcpu; > + int tid; > + int i; > + > + tid = vcpu->run->s.regs.gprs[(vcpu->arch.sie_block->ipa & 0xf0) >> 4]; > + vcpu->stat.diagnose_9c++; > + VCPU_EVENT(vcpu, 5, "diag time slice end directed to %d", tid); > + > + if (tid == vcpu->vcpu_id) > + return 0; > + > + kvm_for_each_vcpu(i, tcpu, kvm) > + if (tcpu->vcpu_id == tid) {
Wouldn't kvm_get_vcpu(kvm, tid) be what you want here? Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
