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Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay

From Wanpeng Li <kernellwp@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay
Date 2017-06-29 10:20 +0200
Message-ID <tXCQa-5a5-9@gated-at.bofh.it> (permalink)
References (1 earlier) <tXk6S-6H0-5@gated-at.bofh.it> <tXm8F-7TU-1@gated-at.bofh.it> <tXmim-7Xs-19@gated-at.bofh.it> <tXyCR-2nE-3@gated-at.bofh.it> <tXCwP-4ON-29@gated-at.bofh.it>
Organization linux.* mail to news gateway

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2017-06-29 15:55 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>:
>> +
>> +            /* In case the sw timer triggered in the window */
>> +            if (atomic_read(&apic->lapic_timer.pending) &&
>> +                !apic_lvtt_period(apic))
>> +                need_cancel = true;
>> +            else if (r && (apic_lvtt_oneshot(apic) ||
>> apic_lvtt_tscdeadline(apic)))
>> +                apic_timer_expired(apic);
>> +        }
>> +    }

[...]

>
> You still need to enable the preemption timer even if you return 1, so
> in lapic.c it becomes
>
>         if (!apic_lvtt_period(apic)) {
>                 if (r)
>                         apic_timer_expired(apic);
>                 if (atomic_read(&apic->lapic_timer.pending))
>                         need_cancel = true;
>         }

I think the codes are more clear but the same as above. We didn't
program preemption timer vmcs field if delta == 0, so how to
understand "need to enable the preemption timer even if return 1"?

>
>
> Otherwise it looks good.  Thanks for your persistence. :)

Thanks for your help and patient. :)

Regards,
Wanpeng Li

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Thread

[PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-28 03:30 +0200
  Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Paolo Bonzini <pbonzini@redhat.com> - 2017-06-28 14:20 +0200
    Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-28 16:00 +0200
      Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Paolo Bonzini <pbonzini@redhat.com> - 2017-06-28 16:10 +0200
        Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-28 16:10 +0200
    Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-28 16:30 +0200
      Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Paolo Bonzini <pbonzini@redhat.com> - 2017-06-28 16:40 +0200
        Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-29 05:50 +0200
          Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Paolo Bonzini <pbonzini@redhat.com> - 2017-06-29 10:00 +0200
            Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-29 10:20 +0200
              Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-29 10:50 +0200
                Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Paolo Bonzini <pbonzini@redhat.com> - 2017-06-29 13:50 +0200
                Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-29 14:00 +0200
            Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Wanpeng Li <kernellwp@gmail.com> - 2017-06-29 14:10 +0200
              Re: [PATCH v3] KVM: LAPIC: Fix lapic timer injection delay Paolo Bonzini <pbonzini@redhat.com> - 2017-06-29 14:20 +0200

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