From: Paolo Bonzini <pbonzini@redhat.com>
To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Amit Shah <amit.shah@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
qemu-devel@nongnu.org, Anthony Liguori <anthony@codemonkey.ws>,
Luiz Capitulino <lcapitulino@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v2 3/3] Add rate limiting of RTC_CHANGE, BALLOON_CHANGE & WATCHDOG events
Date: Wed, 13 Jun 2012 17:35:47 +0200 [thread overview]
Message-ID: <4FD8B353.1060806@redhat.com> (raw)
In-Reply-To: <20120613150658.GD29641@redhat.com>
Il 13/06/2012 17:06, Daniel P. Berrange ha scritto:
> On Wed, Jun 13, 2012 at 04:57:28PM +0200, Paolo Bonzini wrote:
>> Il 13/06/2012 16:53, Daniel P. Berrange ha scritto:
>>>>>>> I don't think SUSPEND can be used to DoS, since once the VM
>>>>>>> is in the suspend state, a monitor command is required to wake
>>>>>>> it up again before the guest OS can trigger a new suspend.
>>>>>
>>>>> Can't the guest OS awake itself?
>>> I didn't think so. Even if it can, we can't rate limit SUSPEND
>>> events in isolation, because they must be strictly ordered
>>> wrt RESUME events.
>>
>> It can program the RTC to awake the OS, but only at 1 wakeup/second.
>
> Ah that hardware rate limit is good - we don't need todo separate
> throttling with this event then.
Hmm, the ACPI PMTimer could be worse though. Perhaps we could write a
kvm-unit-test and time how many wakeups we can do per second.
Paolo
next prev parent reply other threads:[~2012-06-13 15:36 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-21 16:59 [Qemu-devel] [PATCH v2 0/3] Event notifications for balloon driver Daniel P. Berrange
2012-05-21 16:59 ` [Qemu-devel] [PATCH v2 1/3] Add 'query-events' command to QMP to query async events Daniel P. Berrange
2012-05-22 20:47 ` Luiz Capitulino
2012-05-21 16:59 ` [Qemu-devel] [PATCH v2 2/3] Add event notification for guest balloon changes Daniel P. Berrange
2012-05-21 19:44 ` Amit Shah
2012-05-21 19:50 ` Daniel P. Berrange
2012-05-22 12:50 ` Amit Shah
2012-05-21 16:59 ` [Qemu-devel] [PATCH v2 3/3] Add rate limiting of RTC_CHANGE, BALLOON_CHANGE & WATCHDOG events Daniel P. Berrange
[not found] ` <20120530155037.4e5d46df@doriath.home>
2012-06-08 16:48 ` Daniel P. Berrange
2012-06-11 17:22 ` Luiz Capitulino
2012-06-13 14:53 ` Daniel P. Berrange
2012-06-13 14:57 ` Paolo Bonzini
2012-06-13 15:06 ` Daniel P. Berrange
2012-06-13 15:35 ` Paolo Bonzini [this message]
2012-06-13 15:04 ` Daniel P. Berrange
2012-05-22 20:55 ` [Qemu-devel] [PATCH v2 0/3] Event notifications for balloon driver Luiz Capitulino
2012-05-23 10:35 ` Daniel P. Berrange
2012-05-23 14:16 ` Luiz Capitulino
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