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Re: [Qemu-discuss] [kubevirt-dev] Re: Converting qcow2 image on the fly

From: Daniel P . Berrangé
Subject: Re: [Qemu-discuss] [kubevirt-dev] Re: Converting qcow2 image on the fly to raw format
Date: Fri, 20 Jul 2018 10:11:07 +0100
User-agent: Mutt/1.10.0 (2018-05-17)

On Thu, Jul 19, 2018 at 09:50:00PM +0300, Nir Soffer wrote:
> On Mon, Jul 16, 2018 at 11:56 AM Daniel P. Berrangé <address@hidden>
> wrote:
> ...
> > Recommendation is to run 'qemu-img info' to extract the metadata and sanity
> > check results eg no backing file list, not unreasonable size, etc. When
> > running 'qemu-img info' apply process limits of 30 secs CPU time, and 1 GB
> > address space.
> >
> Can you explain the values of cpu seconds and addres space?

Initially the values were (informed) guesswork. After testing real world
examples we settled on these values as providing protection from DOS,
while not causing valid images to be rejected

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