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kvm/x86: Hyper-V unify stimer_start() and stimer_restart() 

This will be used in future to start Hyper-V SynIC timer
in several places by one logic in one function.

Changes v2:
* drop stimer->count == 0 check inside stimer_start()
* comment stimer_start() assumptions

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: qemu-devel@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Andrey Smetanin 2015-12-28 18:27:20 +03:00 committed by Paolo Bonzini
parent 019b9781cc
commit f808495da5
1 changed files with 20 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
arch/x86/kvm/hyperv.c
View File

@ -408,6 +408,7 @@ static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
clear_bit(stimer->index,
vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap);
stimer->msg_pending = false;
stimer->exp_time = 0;
}
static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
@ -420,24 +421,11 @@ static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
return HRTIMER_NORESTART;
}
static void stimer_restart(struct kvm_vcpu_hv_stimer *stimer)
{
u64 time_now;
ktime_t ktime_now;
u64 remainder;
time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
ktime_now = ktime_get();
div64_u64_rem(time_now - stimer->exp_time, stimer->count, &remainder);
stimer->exp_time = time_now + (stimer->count - remainder);
hrtimer_start(&stimer->timer,
ktime_add_ns(ktime_now,
100 * (stimer->exp_time - time_now)),
HRTIMER_MODE_ABS);
}
/*
* stimer_start() assumptions:
* a) stimer->count is not equal to 0
* b) stimer->config has HV_STIMER_ENABLE flag
*/
static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
{
u64 time_now;
@ -447,12 +435,21 @@ static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
ktime_now = ktime_get();
if (stimer->config & HV_STIMER_PERIODIC) {
if (stimer->count == 0)
return -EINVAL;
if (stimer->exp_time) {
if (time_now >= stimer->exp_time) {
u64 remainder;
div64_u64_rem(time_now - stimer->exp_time,
stimer->count, &remainder);
stimer->exp_time =
time_now + (stimer->count - remainder);
}
} else
stimer->exp_time = time_now + stimer->count;
stimer->exp_time = time_now + stimer->count;
hrtimer_start(&stimer->timer,
ktime_add_ns(ktime_now, 100 * stimer->count),
ktime_add_ns(ktime_now,
100 * (stimer->exp_time - time_now)),
HRTIMER_MODE_ABS);
return 0;
}
@ -580,7 +577,7 @@ static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
if (!(stimer->config & HV_STIMER_PERIODIC))
stimer->config &= ~HV_STIMER_ENABLE;
else
stimer_restart(stimer);
stimer_start(stimer);
}
void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)