Re: [Xen-devel] RAM security

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

On 06/12/10 17:12, Jonathan Tripathy wrote:
> 3) If the physical server was shutdown (e.g. plug pulled), I'm guessing
> > > > > > this will presetn a problem?
> > > > > Xen scrubs all memory during boot, unless told not to via a boot 
> > > > > parameter.
> > > > Now this bit of code makes me happy!
> > > >
> > > > Just wondering, if Xen scrubs all memory during boot, why is 
> > > > booting the
> > > > Hypervisor so fast? My machine has 8GB of RAM and starts nice and 
> > > > snappy..
> > > It probably takes just a couple of seconds to scrub 8GB.
> > Plus it doesn't scrub the memory assigned to Dom0.
> Doesn't this mean that if Dom0 releases some memory back to Xen, then 
> Xen gives it to another domain, data leakage could occur?
> Would one way to prevent this be to disable ballooning?
Silly me, Dom0 should scrub the RAM before releasing it back to Xen, as 
mentioned in previous post!
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