KVM: ppc: Handle guest idle by emulating MSR[WE] writes

[linux-2.6-omap-h63xx.git] / arch / powerpc / kvm / powerpc.c

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index bad40bd2d3ac5e966926487cb10df89513e2acc6..777e0f34e0ea12d60e643a47f0b68af5a6bdc930 100644 (file)
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -36,13 +36,12 @@ gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 
 int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
 {
-       /* XXX implement me */
-       return 0;
+       return !!(v->arch.pending_exceptions);
 }
 
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 {
-       return 1;
+       return !(v->arch.msr & MSR_WE);
 }
 
 
@@ -214,6 +213,11 @@ static void kvmppc_decrementer_func(unsigned long data)
        struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 
        kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
+
+       if (waitqueue_active(&vcpu->wq)) {
+               wake_up_interruptible(&vcpu->wq);
+               vcpu->stat.halt_wakeup++;
+       }
 }
 
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
@@ -339,6 +343,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
        int r;
        sigset_t sigsaved;
 
+       vcpu_load(vcpu);
+
        if (vcpu->sigset_active)
                sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 
@@ -363,12 +369,20 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
        if (vcpu->sigset_active)
                sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 
+       vcpu_put(vcpu);
+
        return r;
 }
 
 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 {
        kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
+
+       if (waitqueue_active(&vcpu->wq)) {
+               wake_up_interruptible(&vcpu->wq);
+               vcpu->stat.halt_wakeup++;
+       }
+
        return 0;
 }