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| author | Andrey Smetanin <asmetanin@virtuozzo.com> | 2015-12-28 15:27:21 (GMT) |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-01-08 18:04:41 (GMT) |
| commit | 0cdeabb1186fc3a6c7854f05cec7c99e32935ebc (patch) | |
| tree | 9669ccea141691fe28419654a1aa745e18c361a2 /arch/x86/kvm | |
| parent | f808495da56f28e94c6448125158f1175009fcfc (diff) | |
| download | linux-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.c | 26 |
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); } } } |