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Date: Wed, 13 Jun 2012 16:57:28 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v2 3/3] Add rate limiting of RTC_CHANGE,
 BALLOON_CHANGE & WATCHDOG events
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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>

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.

Paolo