Re: [Xen-users] How to build a PV domU kernel

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, May 14, 2010 at 12:24:02AM +0800, lei yang wrote:
>    On Fri, May 14, 2010 at 12:17 AM, Pasi Kärkkäinen <[1]pasik@xxxxxx> wrote:
> 
>      On Fri, May 14, 2010 at 12:10:28AM +0800, lei yang wrote:
>      >    On Thu, May 13, 2010 at 11:53 PM, Pasi Kärkkäinen
>      <[1][2]pasik@xxxxxx> wrote:
>      >
>      >      On Thu, May 13, 2010 at 11:47:03PM +0800, lei yang wrote:
>      >      >    On Thu, May 13, 2010 at 8:33 PM, Pasi Kärkkäinen
>      >      <[1][2][3]pasik@xxxxxx> wrote:
>      >      >
>      >      >      On Thu, May 13, 2010 at 11:13:00AM +0800, lei yang wrote:
>      >      >      >    Hi All,
>      >      >      >
>      >      >      >    I download a xen 4.0.0, after I run "make world" I
>      got a
>      >      2.6.33.1
>      >      >      kernel,
>      >      >      >    it should be a kernel for Dom0, my question is " how
>      to get
>      >      a domU
>      >      >      kernel
>      >      >      >    for 2.6.33.1"
>      >      >      >
>      >      >
>      >      >      The same kernel can be used also for domU.
>      >      >
>      >      >
>      >      >    a.I'm confused by this in the readme of xen4.0.0, I saw we
>      can get
>      >      domU
>      >      >    with "   KERNELS="linux-2.6-xen0 linux-2.6-xenU"" when run
>      "make",
>      >      and I
>      >      >    got two kernel one is for dom0, anther is domU, the size of
>      dom0 is
>      >      bigger
>      >      >    than domU, do you mean we can ignor
>      this(KERNELS="linux-2.6-xen0
>      >      >    linux-2.6-xenU), just use one dom0 kernel for domU?
>      >      >
>      >
>      >      Those options are required for building the linux-2.6.18-xen
>      based "old"
>      >      xenlinux kernels.
>      >      If you don't specify KERNELS= at all, and only use "make world",
>      it'll
>      >      build you a pvops kernel.
>      >      >    b. if I saw some document, they tell "the dom0 need the
>      patch for
>      >      xen "
>      >      >    eg:wget
>      >      >
>      >
>      
> [2][3][4]http://gentoo-xen-kernel.googlecode.com/files/xen-patches-2.6.33-1.tar.bz2
>      >      >    , my question is "does domU kernel need this patch?
>      >      >
>      >
>      >      If you want to build a Xenlinux based domU kernel, then you need
>      that
>      >      patch.
>      >      pvops kernels don't require that patch.
>      >
>      >      See [4][5]http://wiki.xensource.com/xenwiki/XenDom0Kernels for
>      more
>      >      information.
>      >      That says Dom0Kernels, but it also applies for domU kernels.
>      >
>      >
>      >    do you mean the Dom0 kernel *image* can be used for DomU? one quick
>      >    quesion here"
>      >    dom0 enabled CONFIG_XEN_DOM0=y , if we use dom0 kernel image for
>      domU, do
>      >    we need to disable this CONFIG_XEN_DOM0
>      >
> 
>      The exact same built binary *image* can be used for dom0 and domU.
> 
>      When booting the same image as domU it won't have access to any of the
>      privileged (dom0) things, so having the CONFIG_XEN_DOM0 enabled doesn't
>      matter.
> 
> 
> 
>    It seems the patch for dom0 doesn't affect domU boot when use dom0 kernel
>    for domU.
>    domU doesn't need that patch.
> 

I'm not sure which patch you're talking about here..

Anyway, upstream kernel.org kernels run as Xen PV guests without any additional
patches, using the Linux pvops framework.

-- Pasi


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