projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d3c7b77d MT |
1 | #include <linux/kvm_host.h> |
| 2 | #include <linux/kvm.h> | |
| 3 | #include <linux/hrtimer.h> | |
| 4 | #include <asm/atomic.h> | |
| 5 | #include "kvm_timer.h" | |
| 6 | ||
| 7 | static int __kvm_timer_fn(struct kvm_vcpu *vcpu, struct kvm_timer *ktimer) | |
| 8 | { | |
| 9 | int restart_timer = 0; | |
| 10 | wait_queue_head_t *q = &vcpu->wq; | |
| 11 | ||
| f7104db2 JK |
12 | /* |
| 13 | * There is a race window between reading and incrementing, but we do | |
| 14 | * not care about potentially loosing timer events in the !reinject | |
| 15 | * case anyway. | |
| 16 | */ | |
| 17 | if (ktimer->reinject || !atomic_read(&ktimer->pending)) { | |
| 18 | /* FIXME: this code should not know anything about vcpus */ | |
| 19 | if (!atomic_inc_and_test(&ktimer->pending)) | |
| 20 | set_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests); | |
| 21 | } | |
| d3c7b77d MT |
22 | |
| 23 | if (waitqueue_active(q)) | |
| 24 | wake_up_interruptible(q); | |
| 25 | ||
| 26 | if (ktimer->t_ops->is_periodic(ktimer)) { | |
| 27 | hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); | |
| 28 | restart_timer = 1; | |
| 29 | } | |
| 30 | ||
| 31 | return restart_timer; | |
| 32 | } | |
| 33 | ||
| 34 | enum hrtimer_restart kvm_timer_fn(struct hrtimer *data) | |
| 35 | { | |
| 36 | int restart_timer; | |
| 37 | struct kvm_vcpu *vcpu; | |
| 38 | struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); | |
| 39 | ||
| 1ed0ce00 | 40 | vcpu = ktimer->vcpu; |
| d3c7b77d MT |
41 | if (!vcpu) |
| 42 | return HRTIMER_NORESTART; | |
| 43 | ||
| 44 | restart_timer = __kvm_timer_fn(vcpu, ktimer); | |
| 45 | if (restart_timer) | |
| 46 | return HRTIMER_RESTART; | |
| 47 | else | |
| 48 | return HRTIMER_NORESTART; | |
| 49 | } | |
| 50 |