Re: [Xen-users] PV on Centos 5 64-bit

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Jens-Petter Salvesen wrote:
> Nico wrote:
>   
> > Jens-Petter Salvesen wrote:
> >     
> > > Hi,
> > >  
> > > I'm having a very difficult time getting paravirtualized Xen running 
> > > on Centos 5 64bit and I'm hoping someone can spot what I'm doing
> > >       
> wrong.
>   
> > > I've been attemping to do this for a few days now and I'm really not 
> > > seeing what I'm doing wrong.
> > >  
> > > Here's what I've done:
> > >  
> > > 1. Installed Centos 5 64-bit on the Dom0 
> > > 2. Installed a fully 
> > > virtualized DomU running Centos 5 64-bit.
> > > 3. Created a new configuration file that will create a
> > >       
> paravirtualized >
>   
> > > DomU
> > >       
> > Why aren't you using virt-install? Did you want to duplicate the
> >     
> virtual system entirely?
>
> I would prefer to be able to select upon boot-time if the VM is going to
> run as fully virtualized or paravirtualized. That would enable me to
> evaluate both solutions. I thought that it was possible to just make two
> different config files that boot two different kernels for the same VM?
>
> To my understanding, a fully virtualized VM must _not_ run a xen-enabled
> kernel while a paravirtualized VM _requires_ a compatible xen-enabled
> kernel. Is this correct?
>   
Oh, no. A fully virtualized VM can certainly run a Xen enabled kernel 
(barring some oddnesses with particular kernels). But the initrd 
certainly needs the right drivers to do so. I think you'll find that a 
fully virtual VM needs different device drivers than a para-virtualized one.

> > Also, if you're using pygrub, you don't have to state a kernel. I don't
> >     
> know if it breaks things, but it's confusing at best.
>
> I know. That kernel= statement is just a leftover from debugging.
>   
Got it. One thing I've done when doing a restoration from a system 
image, to get the grub set up, is to delete the kernel from the guest 
domain and do a virt-install "upgrade" on top of it.
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