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Re: [Xen-users] Why pv-on-hvm drivers?

To: <xen-users@xxxxxxxxxxxxxxxxxxx>, "Markus Schuster" <ml@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Why pv-on-hvm drivers?
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Sun, 05 Sep 2010 21:23:34 -0600
Delivery-date: Sun, 05 Sep 2010 20:25:33 -0700
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In general, you definitely want to use PV-based kernels for Linux or any 
operating system that supports it (Linux, Solaris, *BSD).  However, there are a 
few scenarios where you may not be able to run a PV kernel and may actually 
need to install HVM, even for an O/S that supports PV.  The primary example I 
can think of is that you have a proprietary kernel module (for a piece of 
hardware or a software application) that is not compiled for Xen-enabled 
kernels.  In this scenario, you're forced to run a kernel that is not 
Xen-aware, but you want to accelerate as many of the devices in the HVM as 
possible, mainly network and disk devices.


>>> On 2010/09/04 at 17:29, Markus Schuster <ml@xxxxxxxxxxxxxxxxxxxx> wrote: 
> Hi list, 
> I've read about recent efforts to push pv-on-hvm drivers to Linux mainline 
> and I'm curious to know the cause for this. What's the advantage over using 
> pv_ops directly and booting the kernel paravirtualized?
> Are there plans to move Linux domUs closer to the KVM way (from an 
> architectural point of view)?
> Hope you can help. 
> Regards,
> Markus

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