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xen-devel
Re: [Xen-devel] Hvm Guest Image
At 09:34 17/07/2007, Xen Xen wrote:
Well the problem is that i want to insert modules compiled from the
unmodified drivers into the hvm guest.
But there is a problem with the module version of both the hvm
guests kernel and the dom0 kernel where i am compiling them. So i
would need the same kernel running as dom0 to run as hvm guest. Any
way i can do it??
If you want to run the same kernel, then you shouldn't be using
HVM-mode [there's no advantage in doing that if your goal isn't to
run a "standard distro as it comes on the media"].
If you still want to run HVM, you need to have two different kernels
+ related modules, as the modules in Dom0 are compiled with the
modified header files (and some have the source modified too) to
allow them to behave nicely in a para-virtual environment (e.g.
calling hypercalls to the Xen kernel when a standard kernel "just
gets on with it").
There is work on coming up with a "para-virt-ops" kernel, which will
"know" whether it's running on a hypervisor or not, and "adjust" it's
internal functionality to suit the environment it's run in, but
that's not ready for use yet [There was a 44-patch-set sent in today
to this mailing list for possible inclusion in the Linux-mainstream kernel].
By the way, the best way to build unmodified drivers is to add the
source-code to your installed guest-kernel, and build them. It should
work reasonably well even with earlier versions of the kernel - as
long as it's 2.6 and reasonably resent - 2.6.9 may not be new enough,
but something a few steppings newer should be fine.
Alternatively, take the linux-2.6.18.tar.bz2 that is downloaded
during the build, untar it outside the xen-tree, add the unmodified
drivers and build that.
--
Mats
On 7/17/07, Mats Petersson
<<mailto:mats@xxxxxxxxxxxxxxxxx>mats@xxxxxxxxxxxxxxxxx> wrote:
At 08:56 17/07/2007, Xen Xen wrote:
>the xen source directory that i downloaded has a ref-linux-2.6.18 directory.
>Is that the unmodified linux that i can use to install a hvm guest??
I don't know if the ref-linux-2.6.18 is suitable to build - it's
there as a "base" for the modifications for para-virtual Linux that
you need at least for Dom0.
Well, the general way to use HVM is to install from a CDROM/DVD (or
ISO-file image instead of a CD/DVD) with a complete distro of Linux
(RedHat, SuSE, Debian, etc).
Where do you get the rest of your Linux distro from? Doesn't that
come with a kernel that you can use? That would be my suggestion.
--
Mats
>On 7/17/07, Mats Petersson
><<mailto:mats@xxxxxxxxxxxxxxxxx><mailto:mats@xxxxxxxxxxxxxxxxx>mats
@planetcatfish.com> wrote:
>At 06:08 17/07/2007, you wrote:
>
> >I downloaded the xen source from the xen site did a make world and
> >make install to get the 2.6.16.33-xen kernel.
> >I made a initrd for the same and booted into it.
> >I want to now set up a hvm guest with the same image( 2.6.16.33-xen)
> >but grub gives me a unsupported executable format error 13?
> >Cant i use the same image for a hvm guest ?
>
>
>For HVM guests, you need an unmodified OS, so you can't use the same
>kernel as with a PV guest. [Unless you load Xen in the guest that is
>- but for most people that adds extra overhead for no extra gain, so
>that's probably not such a good suggestion]
>
>---
>Mats
>
>
> >Thanks
> >_______________________________________________
> >Xen-devel mailing list
> ><mailto:
Xen-devel@xxxxxxxxxxxxxxxxxxx><mailto:Xen-devel@xxxxxxxxxxxxxxxxxxx>Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
>
>_______________________________________________
>Xen-devel mailing list
><mailto:Xen-devel@xxxxxxxxxxxxxxxxxxx>Xen-devel@xxxxxxxxxxxxxxxxxxx
>http://lists.xensource.com/xen-devel
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