Thanks Pasi. I looked at
http://wiki.xensource.com/xenwiki/XenParavirtOps(myforay into linux is
via xen, so please pardon by silly questions)

Using Xen/paravirt_ops

Building with domU support

   1. Get a current kernel. The latest kernel.org kernel is generally a good
   choice.
   2. Configure as normal; you can start with your current .config file
   3. If building 32 bit kernel make sure you have CONFIG_X86_PAE enabled
   (which is set by selecting CONFIG_HIGHMEM64G)
      - non-PAE mode doesn't work in 2.6.25, and has been dropped altogether
      from 2.6.26 and newer kernel versions.
   4. Enable these core options:
      1. CONFIG_PARAVIRT_GUEST
      2. CONFIG_XEN
   5. And Xen pv device support
      1. CONFIG_HVC_DRIVER and CONFIG_HVC_XEN
      2. CONFIG_XEN_BLKDEV_FRONTEND
      3. CONFIG_XEN_NETDEV_FRONTEND
   6. And build as usual

Config doesn't have pcifront in it? don't I need it for pci passthrough? I
have copied linux 2.6.33 source from kernel.org and started building
kernel(irrespective of above questions), but what distribution is this
kernel associated with i.e I thought I should first install linux from a
distribution and rebuild kernel for any modification, but in this case I
don't understand what distribution this is associated with. Inputs much
appreciated.

Thanks




On Fri, Mar 12, 2010 at 9:51 AM, Pasi Kärkkäinen <pasik@iki.fi> wrote:

> On Fri, Mar 12, 2010 at 09:10:31AM -0800, Ritu kaur wrote:
> >    Hi,
> >
> >    I am expanding my question to developers forum to get some quick help
> on
> >    pci passthrough. I am using xcp 0.1.1 as a dom0 and installed Debian
> Lenny
> >    as a domU(as mentioned in
> >    [1]http://wiki.xensource.com/xenwiki/Command_Line_Interface).
> >    Unfortunately, Debian Lenny which the wiki points to doesn't come with
> PV
> >    drivers(I need pcifront driver). I looked up in [2]
> wiki.debian.org/Xen and
> >    I found following snippets
> >
> >    /***The default Lenny kernel is the newer paravirt_ops version
> (2.6.26),
> >    which does not function as a dom0 (except for the -xen variants, which
> >    have dom0 support but also some issues running as domU (please
> clarify?).
> >    It will also not support PCI passthrough in a domU. For PCI
> passthrough,
> >    you have to run the 2.6.18 etch kernel as both dom0 and domU. ***/
> >
>
> I don't know if there are pre-packaged kernels for lenny with pcifront
> driver.
>
> Links to kernel sources that have the pcifront driver:
>
>        - http://xenbits.xen.org/linux-2.6.18-xen.hg
>        - pv_ops xen.git xen/stable 2.6.32.9 and xen/master 2.6.31.6
>          (See: http://wiki.xensource.com/xenwiki/XenParavirtOps)
>        - Kernels with the forward-ported Novell/opensuse Xen patches
> (2.6.29, 2.6.31, 2.6.33)
>          (See: http://wiki.xensource.com/xenwiki/XenDom0Kernels)
>
> >    Can someone let me know what domU has been tested with XCP 0.1.1 for
> pci
> >    passthrough and any pointers to that domU kernel binary or source will
> >    help me out.
> >
>
> Unfortunately I don't know what kernel has been tested.
>
> -- Pasi
>
>