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authorAndrey Smetanin <asmetanin@virtuozzo.com>2015-12-28 15:27:21 (GMT)
committerPaolo Bonzini <pbonzini@redhat.com>2016-01-08 18:04:41 (GMT)
commit0cdeabb1186fc3a6c7854f05cec7c99e32935ebc (patch)
tree9669ccea141691fe28419654a1aa745e18c361a2 /arch/x86/kvm
parentf808495da56f28e94c6448125158f1175009fcfc (diff)
downloadlinux-0cdeabb1186fc3a6c7854f05cec7c99e32935ebc.tar.xz
kvm/x86: Reorg stimer_expiration() to better control timer restart
Split stimer_expiration() into two parts - timer expiration message sending and timer restart/cleanup based on timer state(config). This also fixes a bug where a one-shot timer message whose delivery failed once would get lost for good. 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>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/hyperv.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 0dd7d17..5f85c12 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -554,30 +554,27 @@ static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
return r;
}
-static void stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
+static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
{
struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
struct hv_message *msg = &stimer->msg;
struct hv_timer_message_payload *payload =
(struct hv_timer_message_payload *)&msg->u.payload;
- int r;
- stimer->msg_pending = true;
payload->expiration_time = stimer->exp_time;
payload->delivery_time = get_time_ref_counter(vcpu->kvm);
- r = synic_deliver_msg(vcpu_to_synic(vcpu),
- HV_STIMER_SINT(stimer->config), msg);
- if (!r)
- stimer->msg_pending = false;
+ return synic_deliver_msg(vcpu_to_synic(vcpu),
+ HV_STIMER_SINT(stimer->config), msg);
}
static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
{
- stimer_send_msg(stimer);
- if (!(stimer->config & HV_STIMER_PERIODIC))
- stimer->config &= ~HV_STIMER_ENABLE;
- else
- stimer_start(stimer);
+ stimer->msg_pending = true;
+ if (!stimer_send_msg(stimer)) {
+ stimer->msg_pending = false;
+ if (!(stimer->config & HV_STIMER_PERIODIC))
+ stimer->config &= ~HV_STIMER_ENABLE;
+ }
}
void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
@@ -594,6 +591,11 @@ void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
time_now = get_time_ref_counter(vcpu->kvm);
if (time_now >= stimer->exp_time)
stimer_expiration(stimer);
+
+ if (stimer->config & HV_STIMER_ENABLE)
+ stimer_start(stimer);
+ else
+ stimer_cleanup(stimer);
}
}
}