From: Jan Kiszka <jan.kiszka@siemens.com>
To: Paolo Bonzini <pbonzini@redhat.com>, linux-kernel@vger.kernel.org
Cc: kvm@vger.kernel.org
Subject: Re: [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe
Date: Tue, 25 Nov 2014 20:01:28 +0100 [thread overview]
Message-ID: <5474D208.4080009@siemens.com> (raw)
In-Reply-To: <5474BE7C.5040909@redhat.com>
On 2014-11-25 18:38, Paolo Bonzini wrote:
>
>
> On 25/11/2014 18:21, Marcelo Tosatti wrote:
>> +
>> + if (r == HRTIMER_RESTART) {
>> + do {
>> + ret = hrtimer_start_expires(data, HRTIMER_MODE_ABS);
>> + if (ret == -ETIME)
>> + hrtimer_add_expires_ns(&ktimer->timer,
>> + ktimer->period);
>
> Is it possible to just compute the time where the next interrupt
> happens? I suspect the printk and WARN_ON below can be easily triggered
> by a guest.
We have a lower bound for the period that a guest can program. Unless
that value is set too low, this should practically not happen if we
avoid disturbances while handling the event and reprogramming the next
one (irqs off?).
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2014-11-25 19:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-25 17:21 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v2) Marcelo Tosatti
2014-11-25 17:21 ` [patch -rt 1/2] KVM: use simple waitqueue for vcpu->wq Marcelo Tosatti
2014-11-25 18:57 ` Rik van Riel
2014-11-25 19:08 ` Rik van Riel
2014-11-25 19:30 ` Marcelo Tosatti
2014-11-25 20:23 ` Thomas Gleixner
2014-11-25 17:21 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2014-11-25 17:38 ` Paolo Bonzini
2014-11-25 19:01 ` Jan Kiszka [this message]
2014-12-04 13:43 ` Marcelo Tosatti
2014-11-25 19:11 ` Rik van Riel
2014-11-25 20:24 ` Thomas Gleixner
2014-12-04 13:53 ` Paolo Bonzini
2014-12-05 16:17 ` Marcelo Tosatti
-- strict thread matches above, loose matches on Subject: below --
2015-01-14 17:12 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v3) Marcelo Tosatti
2015-01-14 17:12 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2015-01-14 18:23 ` Rik van Riel
2015-01-21 20:36 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v4) Marcelo Tosatti
2015-01-21 20:36 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
2015-04-08 23:33 [patch -rt 0/2] use simple waitqueue for kvm vcpu waitqueue (v5) Marcelo Tosatti
2015-04-08 23:33 ` [patch -rt 2/2] KVM: lapic: mark LAPIC timer handler as irqsafe Marcelo Tosatti
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