[pve-devel] Qemu / virtio-rng-pci

[Stefan Priebe - Profihost AG]

Am 01.06.2015 um 17:11 schrieb Alexandre DERUMIER <aderumier at odiso.com>:

>>> Sure. I'm just thinking about the check regarding Qemu 2.3. I would also
>>> like to use it for older qemu versions / installations.
>> 
>>> Is there no other way to support it and not to break live migration?
> 
> I don't see how to do it, adding a new pci device by default will break live migration.
> Or we need to add a new option in vmid.conf
> 
> @Dietmar : any opinion ?
> 
> 
> @stef : Can't you maintain a patch to enable it for qemu 2.2 for your needs ?

Sure but see my 2nd mail.

Stefan

> 
> 
> 
> ----- Mail original -----
> De: "Stefan Priebe" <s.priebe at profihost.ag>
> À: "aderumier" <aderumier at odiso.com>
> Cc: "pve-devel" <pve-devel at pve.proxmox.com>
> Envoyé: Lundi 1 Juin 2015 14:58:16
> Objet: Re: [pve-devel] Qemu / virtio-rng-pci
> 
>> Am 01.06.2015 um 14:51 schrieb Alexandre DERUMIER: 
>> I just send a patch.
> 
> Oh great. 
> 
>> can you test it ?
> 
> Sure. I'm just thinking about the check regarding Qemu 2.3. I would also 
> like to use it for older qemu versions / installations. 
> 
> Is there no other way to support it and not to break live migration? 
> 
>> (I'm using /dev/random, not sure we want to add support for hardware entropy devices ?)
> 
> I think not right now. Intel already implemented a CPU Feature flag, so 
> that you do not need entropy devices at all. So i think they get 
> replaced anyway. 
> 
> See: http://en.wikipedia.org/wiki/RdRand 
> 
> Stefan 
> 
>> ----- Mail original ----- 
>> De: "Stefan Priebe" <s.priebe at profihost.ag> 
>> À: "pve-devel" <pve-devel at pve.proxmox.com> 
>> Envoyé: Lundi 1 Juin 2015 12:41:56 
>> Objet: [pve-devel] Qemu / virtio-rng-pci 
>> 
>> Hi, 
>> 
>> while i had not enough entropy in some virtual machines i was wondering 
>> why we don't use virtio-rng-pci as default which is available since qemu 
>> 1.3? 
>> 
>> Here is a red hat article on it: 
>> http://rhelblog.redhat.com/2015/03/09/red-hat-enterprise-linux-virtual-machines-access-to-random-numbers-made-easy/ 
>> 
>> Stefan 
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>