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author | Christian Borntraeger <borntraeger@de.ibm.com> | 2009-05-12 15:21:49 (GMT) |
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committer | Avi Kivity <avi@redhat.com> | 2009-06-10 08:48:55 (GMT) |
commit | ca8723023f25c9a70d76cbd6101f8fb4ffec2fa0 (patch) | |
tree | ef753d244a55271279b5b2cf29b28db5b35b454c /arch/s390/kvm/kvm-s390.h | |
parent | 2668dab794272f0898491acaf1e77e9a005abc0f (diff) | |
download | linux-ca8723023f25c9a70d76cbd6101f8fb4ffec2fa0.tar.xz |
KVM: s390: use hrtimer for clock wakeup from idle - v2
This patch reworks the s390 clock comparator wakeup to hrtimer. The clock
comparator is a per-cpu value that is compared against the TOD clock. If
ckc <= TOD an external interrupt 1004 is triggered. Since the clock comparator
and the TOD clock have a much higher resolution than jiffies we should use
hrtimers to trigger the wakeup. This speeds up guest nanosleep for small
values.
Since hrtimers callbacks run in hard-irq context, I added a tasklet to do
the actual work with enabled interrupts.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.h')
-rw-r--r-- | arch/s390/kvm/kvm-s390.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index 00bbe69..748fee8 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -14,6 +14,7 @@ #ifndef ARCH_S390_KVM_S390_H #define ARCH_S390_KVM_S390_H +#include <linux/hrtimer.h> #include <linux/kvm.h> #include <linux/kvm_host.h> @@ -41,7 +42,8 @@ static inline int __cpu_is_stopped(struct kvm_vcpu *vcpu) } int kvm_s390_handle_wait(struct kvm_vcpu *vcpu); -void kvm_s390_idle_wakeup(unsigned long data); +enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer); +void kvm_s390_tasklet(unsigned long parm); void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu); int kvm_s390_inject_vm(struct kvm *kvm, struct kvm_s390_interrupt *s390int); |