void kvmppc_vcpu_block(struct kvm_vcpu *vcpu)
{
u64 now;
unsigned long dec_nsec;
now = get_tb();
if (now >= vcpu->arch.dec_expires && !kvmppc_core_pending_dec(vcpu))
kvmppc_core_queue_dec(vcpu);
if (vcpu->arch.pending_exceptions)
return;
if (vcpu->arch.dec_expires != ~(u64)0) {
dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC /
tb_ticks_per_sec;
hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
HRTIMER_MODE_REL);
}
kvmppc_vcpu_blocked(vcpu);
kvm_vcpu_block(vcpu);
vcpu->stat.halt_wakeup++;
if (vcpu->arch.dec_expires != ~(u64)0)
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
kvmppc_vcpu_unblocked(vcpu);
}
int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
u64 now;
if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR;
return -EINTR;
}
flush_fp_to_thread(current);
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
preempt_disable();
/*
* Make sure we are running on thread 0, and that
* secondary threads are offline.
* XXX we should also block attempts to bring any
* secondary threads online.
*/
if (threads_per_core > 1) {
int cpu = smp_processor_id();
int thr = cpu_thread_in_core(cpu);
if (thr)
goto out;
while (++thr < threads_per_core)
if (cpu_online(cpu + thr))
goto out;
}
kvm_guest_enter();
__kvmppc_vcore_entry(NULL, vcpu);
kvm_guest_exit();
preempt_enable();
kvm_resched(vcpu);
now = get_tb();
/* cancel pending dec exception if dec is positive */
if (now < vcpu->arch.dec_expires && kvmppc_core_pending_dec(vcpu))
kvmppc_core_dequeue_dec(vcpu);
return kvmppc_handle_exit(run, vcpu, current);
out:
preempt_enable();
return -EBUSY;
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return kvmppc_core_pending_dec(vcpu);
}
