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KVM: PPC: booke: Improve timer register emulation

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Decrementers are now properly driven by TCR/TSR, and the guest
has full read/write access to these registers.

The decrementer keeps ticking (and setting the TSR bit) regardless of
whether the interrupts are enabled with TCR.

The decrementer stops at zero, rather than going negative.

Decrementers (and FITs, once implemented) are delivered as
level-triggered interrupts -- dequeued when the TSR bit is cleared, not
on delivery.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
[scottwood@freescale.com: significant changes]
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Scott Wood
2011-11-17 12:39:59 +00:00
committed by Avi Kivity
parent b59049720d
commit dfd4d47e9a
8 changed files with 114 additions and 69 deletions
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33
arch/powerpc/kvm/powerpc.c
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@@ -39,7 +39,8 @@
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
return !(v->arch.shared->msr & MSR_WE) ||
!!(v->arch.pending_exceptions);
!!(v->arch.pending_exceptions) ||
v->requests;
}
int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
@@ -311,18 +312,6 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
return kvmppc_core_pending_dec(vcpu);
}
static void kvmppc_decrementer_func(unsigned long data)
{
struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
kvmppc_core_queue_dec(vcpu);
if (waitqueue_active(vcpu->arch.wqp)) {
wake_up_interruptible(vcpu->arch.wqp);
vcpu->stat.halt_wakeup++;
}
}
/*
* low level hrtimer wake routine. Because this runs in hardirq context
* we schedule a tasklet to do the real work.
@@ -567,6 +556,16 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
return r;
}
void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
{
if (waitqueue_active(&vcpu->wq)) {
wake_up_interruptible(vcpu->arch.wqp);
vcpu->stat.halt_wakeup++;
} else if (vcpu->cpu != -1) {
smp_send_reschedule(vcpu->cpu);
}
}
int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
if (irq->irq == KVM_INTERRUPT_UNSET) {
@@ -575,13 +574,7 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
}
kvmppc_core_queue_external(vcpu, irq);
if (waitqueue_active(vcpu->arch.wqp)) {
wake_up_interruptible(vcpu->arch.wqp);
vcpu->stat.halt_wakeup++;
} else if (vcpu->cpu != -1) {
smp_send_reschedule(vcpu->cpu);
}
kvm_vcpu_kick(vcpu);
return 0;
}