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Date: Fri, 08 Jan 2010 10:31:28 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] Re: [RFD] virtio: Add memory statistics reporting
	to the balloon driver
References: <1262711318.10698.104.camel@aglitke>	<4B45F9CA.7050903@codemonkey.ws>	<20100107154918.GB19168@redhat.com>	<1262881658.2767.12.camel@aglitke>	<4B460E55.9090800@redhat.com>	<4B461233.2020808@codemonkey.ws>	<20100107155830.71fc3f76@doriath>
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To: Luiz Capitulino <lcapitulino@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>, Avi Kivity <avi@redhat.com>, Adam Litke <agl@us.ibm.com>

On 01/07/2010 12:30 PM, Luiz Capitulino wrote:
> On Thu, 7 Jan 2010 15:58:30 -0200
> Luiz Capitulino<lcapitulino@redhat.com>  wrote:
>
>    
>>   I like Daniel's idea too. In practice 'refresh-balloon' is going to
>> be Anthony's idea #1 for the QMP case, which seems the right way to
>> do it with QMP.
>>      
>   Hm, something that has just occurred to me: it's easy to have
> async messages in the user Monitor, we could add a new type of
> user print callback called async_print.
>
>   This new callback would be called by the Monitor when the async
> message API is called but we are in user mode.
>
>   This is really today's user_print, but user data is printed
> asynchronously.
>    

Even if we did that, it still suffers from the problem of a malicious or 
broken guest that would not respond thereby hanging the monitor.

Regards,

Anthony Liguori