Re: [PATCH XEN] tools: Update files examples PV&PVH with pygrub.

[Alexandre GRIVEAUX <agriveaux@xxxxxxxxxxxx>]

Le 13/01/2026 à 07:15, Juergen Gross a écrit :
> On 12.01.26 23:44, Alexandre GRIVEAUX wrote:
> > Update files exemples PV&PVH for non direct kernel boot with pygrub.
> >
> > Signed-off-by: Alexandre GRIVEAUX <agriveaux@xxxxxxxxxxxx>
> > ---
> >   tools/examples/xlexample.pvhlinux | 3 +++
> >   tools/examples/xlexample.pvlinux  | 3 +++
> >   2 files changed, 6 insertions(+)
> >
> > diff --git a/tools/examples/xlexample.pvhlinux 
> > b/tools/examples/xlexample.pvhlinux
> > index 18305b80af..2bdd43c2c5 100644
> > --- a/tools/examples/xlexample.pvhlinux
> > +++ b/tools/examples/xlexample.pvhlinux
> > @@ -25,6 +25,9 @@ kernel = "/boot/vmlinuz"
> >   # Kernel command line options
> >   extra = "root=/dev/xvda1"
> >   +# Enable to use a grub2 emulation inside guest instead of direct 
> > kernel boot.
> I don't think this is correct.
>
> pygrub is running in dom0, not in the guest.
>
>
> Juergen
Hello,


I doesn't understand your reply, yes pygrub is running on the Dom0, and 
this goal is to behave like there is a grub2 on the DomU.

My wording seem too confuse for you ? You would like this:

Enable to use a "grub2 emulation inside guest" instead of direct kernel 
boot.
Or

Enable to use a emulation of grub2 inside guest instead of direct kernel 
boot.
Or

Enable to use a emulation of grub2 for guest instead of direct kernel boot.


For me, using wiktionary:

emulate (computing <https://en.wiktionary.org/wiki/computing#Noun>) of a 
program or device: to imitate another program or device

And according to man page of xl.cfg:

> *bootloader="PROGRAM"* 
> <https://manpages.debian.org/trixie/xen-utils-common/xl.cfg.5.en.html#bootloader=_PROGRAM_>
>     Run "PROGRAM" to find the kernel image and ramdisk to use.
>     Normally "PROGRAM" would be "pygrub", which is an emulation of
>     grub/grub2/syslinux. Either *kernel* or *bootloader* must be
>     specified for PV guests. 
And when using it like with a lx start -c <name>.cfg, one of the screen 
will welcome an user with pygrub.
Thanks.