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RE: [Xen-users] Why HVM?

To: "Felix Kuperjans" <felix@xxxxxxxxxxxxxxxxxx>, <Xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Why HVM?
From: "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>
Date: Fri, 27 Aug 2010 11:37:12 +0100
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Hi Felix,
This is exactly what I thought.
Currently with my VPS offering, I use pygrub, with the user's kernel being stored on their disk image, so they can change it if they like

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx on behalf of Felix Kuperjans
Sent: Fri 27/08/2010 11:33
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Why HVM?

Hi Jonathan,

The only big advantage is that customers can install operating systems that do not support pv operation (e.g. Windows). Some small advantages like using own GRUB or kernels can be achieved in pv environment, too (pvgrub, pygrub), but those hosters probably don't enable that for pv VPS.
Another little point is that not all HVM features are available for pv guests, especially with pv_ops guest and host kernels (for example: USB passthrough, PCI / VGA passthrough; the first two not yet with pv_ops kernels, VGA passthrough is always only available for HVMs). But as long as you don't want to offer physical hardware to your clients, this doesn't matter for VPS hosting.

Probably I missed an important point, but AFAIK there is no advantage of having a Linux server system in a HVM instead of a PV VM.


Am 27.08.2010 08:41, schrieb Jonathan Tripathy:
Hi Everyone,

I've noticed some VPS hosting companies offering a Xen "HVM" option. What are the advantages of a Linux HVM VPS over a PV one?

Many Thanks
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