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Re: [Xen-devel] [Xen Hackathon] new PV drivers

  • To: xen-devel@xxxxxxxxxxxxx
  • From: Andy Smith <andy@xxxxxxxxxxxxxx>
  • Date: Mon, 9 Jun 2014 19:16:19 +0000
  • Delivery-date: Mon, 09 Jun 2014 19:16:25 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>
  • Openpgp: id=BF15490B; url=http://strugglers.net/~andy/pubkey.asc


On Mon, Jun 09, 2014 at 04:06:25PM +0100, Ian Campbell wrote:
> On Mon, 2014-06-09 at 10:55 -0400, Boris Ostrovsky wrote:
> > Feeding is done by interrupt timing and block device access latency, 
> > both of which are happening in a guest. I don't know whether there is 
> > enough of that but perhaps before embarking on new PV driver it may be 
> > worth investigating quality of existing entropy source. Or maybe it's 
> > already been looked at.
> I've not done the numbers/investigated it myself but it's a quite widely
> held belief that those things are not sufficient in a virtual machine. 

Available entropy in my VMs is much lower than on the dom0, to the
point where I had customers doing a lot of HTTPS/TLS who were
expeirencing stalls.

I bought a couple of Entropy Keys and shipped in entropy to the VMs
via an additional daemon.


A software solution to seed entropy in VMs from the dom0's pool
would be welcome.


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