[Xen-users] Re: Some questions from a novice

[Zhiming Wu <zhiming.wu.atgm@xxxxxxxxx>]

Hi Sadique,

Thank you very much for your detailed explanation.

Best Regards,
Zhiming Wu

Sadique Puthen wrote:
> Zhiming Wu wrote:
> > Hello all,
> >
> > I am a novice at Xen and I have some questions about it and I will
> > deeply appreciate the answer from any of you.
> >
> > 1. Can Xen be run on CPU that not support Virtualization Technology?
> > Because I have a Pentium M CPU that does not support VT.
> There are two types of guests. para-virtualized and fully virtualized.
> Para-virtualized guests run a modified kernel which understands that
> it's running in a virtualized environment, hence does not require
> emulation. Fully virtualized guests does the unmodified generic kernel
> and requires everything to be emulated and which requires supprt VT.
> Bottom line is that, to run para-virtualized guest VT is not needed, but
> for fully virtualized guests VT is required.
>
> > 2. What is each variety of Xen kernel for? For example kernel-2.6-xen,
> > kernel-2.6-xen0 and kernel-2.6-xenU. Which one should be used for the
> > host OS? What are the differences between kernel-2.6-xen and
> > kernel-2.6-xen0?
> kernel-2.6-xen0 is the kernel which one need to run on the host kernel.
> kernel-2.6-xenU is the one modified kernel to run on guest os. Acutally
> you can run xen0 to boot your guests as well, but xenU kernel makes sure
> that it only includes the required drivers for the guest to run.
>
> New distributions like RHEL, Centos, Fedora and etc ship only one kernel
> which is kernel-xen and is used to run both host and guests.
>
> > 3. I have to build the customer Xen kernel to support some special
> > device, can a newer version, such as 2.6.23.9 used in my system now, of
> > linux kernel be used?
> You have to either forward port xen to 2.6.23 or backward port your
> patch to the current version. Fedora does forward porting, but it's
> still at 2.6.21.
>
> --Sadique
> > Thanks!
> >
> > Best Regards,
> > Zhiming Wu
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users

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