diff options
Diffstat (limited to 'arch/x86/kvm/timer.c')
| -rw-r--r-- | arch/x86/kvm/timer.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/x86/kvm/timer.c b/arch/x86/kvm/timer.c new file mode 100644 index 000000000000..86dbac072d0c --- /dev/null +++ b/arch/x86/kvm/timer.c @@ -0,0 +1,46 @@ +#include <linux/kvm_host.h> +#include <linux/kvm.h> +#include <linux/hrtimer.h> +#include <asm/atomic.h> +#include "kvm_timer.h" + +static int __kvm_timer_fn(struct kvm_vcpu *vcpu, struct kvm_timer *ktimer) +{ + int restart_timer = 0; + wait_queue_head_t *q = &vcpu->wq; + + /* FIXME: this code should not know anything about vcpus */ + if (!atomic_inc_and_test(&ktimer->pending)) + set_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests); + + if (!ktimer->reinject) + atomic_set(&ktimer->pending, 1); + + if (waitqueue_active(q)) + wake_up_interruptible(q); + + if (ktimer->t_ops->is_periodic(ktimer)) { + hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); + restart_timer = 1; + } + + return restart_timer; +} + +enum hrtimer_restart kvm_timer_fn(struct hrtimer *data) +{ + int restart_timer; + struct kvm_vcpu *vcpu; + struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); + + vcpu = ktimer->kvm->vcpus[ktimer->vcpu_id]; + if (!vcpu) + return HRTIMER_NORESTART; + + restart_timer = __kvm_timer_fn(vcpu, ktimer); + if (restart_timer) + return HRTIMER_RESTART; + else + return HRTIMER_NORESTART; +} + |