Re: [Xen-devel] domU guest for xcp 0.1.1

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Mar 12, 2010 at 05:51:20PM -0800, Ritu kaur wrote:
>    Thanks Pasi. I looked at
>    [1]http://wiki.xensource.com/xenwiki/XenParavirtOps(my foray 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 [2]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 [3]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.
> 

You need to check out Jeremy's xen.git, and possibly xen/stable branch from 
there,
to have the pcifront driver. It's not yet in the upstream kernel.org kernel.

-- Pasi

>    Thanks
> 
>    On Fri, Mar 12, 2010 at 9:51 AM, Pasi Kärkkäinen <[4]pasik@xxxxxx> 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][5]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][6]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:
> 
>             - [7]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: [8]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: [9]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
> 
> References
> 
>    Visible links
>    1. http://wiki.xensource.com/xenwiki/XenParavirtOps(my
>    2. http://kernel.org/
>    3. http://kernel.org/
>    4. mailto:pasik@xxxxxx
>    5. http://wiki.xensource.com/xenwiki/Command_Line_Interface
>    6. http://wiki.debian.org/Xen
>    7. http://xenbits.xen.org/linux-2.6.18-xen.hg
>    8. http://wiki.xensource.com/xenwiki/XenParavirtOps
>    9. http://wiki.xensource.com/xenwiki/XenDom0Kernels

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