static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
int r;
again:
preempt_disable();
kvm_prepare_guest_switch(vcpu);
local_irq_disable();
if (signal_pending(current)) {
local_irq_enable();
preempt_enable();
r = -EINTR;
kvm_run->exit_reason = KVM_EXIT_INTR;
goto out;
}
vcpu->guest_mode = 1;
kvm_guest_enter();
r = vti_vcpu_run(vcpu, kvm_run);
if (r < 0) {
local_irq_enable();
preempt_enable();
kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
goto out;
}
vcpu->arch.launched = 1;
vcpu->guest_mode = 0;
local_irq_enable();
/*
* We must have an instruction between local_irq_enable() and
* kvm_guest_exit(), so the timer interrupt isn't delayed by
* the interrupt shadow. The stat.exits increment will do nicely.
* But we need to prevent reordering, hence this barrier():
*/
barrier();
kvm_guest_exit();
preempt_enable();
r = kvm_handle_exit(kvm_run, vcpu);
if (r > 0) {
if (!need_resched())
goto again;
}
out:
if (r > 0) {
kvm_resched(vcpu);
goto again;
}
return r;
}
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;
}
