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Re: [Qemu-devel] [PATCH v2 3/3] Add rate limiting of RTC_CHANGE, BALLOON
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From: |
Paolo Bonzini |
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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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Date: |
Wed, 13 Jun 2012 16:57:28 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
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