summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/powerpc.c
diff options
context:
space:
mode:
authorHollis Blanchard <hollisb@us.ibm.com>2008-04-25 17:55:49 -0500
committerAvi Kivity <avi@qumranet.com>2008-05-04 14:44:44 +0300
commit45c5eb67da5a668abe79c23a7e64dbc87a600f90 (patch)
treeb2b9ff85ecb5b35d246d68da94b20cb9f9912bff /arch/powerpc/kvm/powerpc.c
parent3fe913e7c550a869e250d04c34410f7a6e263f7c (diff)
downloadop-kernel-dev-45c5eb67da5a668abe79c23a7e64dbc87a600f90.zip
op-kernel-dev-45c5eb67da5a668abe79c23a7e64dbc87a600f90.tar.gz
KVM: ppc: Handle guest idle by emulating MSR[WE] writes
This reduces host CPU usage when the guest is idle. However, the guest must set MSR[WE] in its idle loop, which Linux did not do until 2.6.26. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/powerpc/kvm/powerpc.c')
-rw-r--r--arch/powerpc/kvm/powerpc.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index bad40bd..777e0f3 100644
--- 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;
}
OpenPOWER on IntegriCloud