Re: [PATCH 1/2] Fix util/grub.d/20_linux_xen.in: Add xen_boot command support for aarch64

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Aug 29, 2017 at 03:12:59PM +0800, Fu Wei Fu wrote:
> Hi  Konrad,
> 
> Thanks for your feedback.

Thank you for speedy response!
> 
> On 29 August 2017 at 02:40, Konrad Rzeszutek Wilk
> <konrad.wilk@oracle.com> wrote:
> > Commit d33045ce7ffcb7c1e4a60c14d5ca64b36e3c5abe introduced
> > the support for this, but it does not work under x86 (as it stops
> > 20_linux_xen from running).
> >
> > The 20_linux_xen is run under a shell and any exits from within it:
> >
> 
> For your example
> 
> > (For example on x86):
> > + /usr/bin/grub2-file --is-arm64-efi /boot/xen-4.9.0.gz
> > [root@tst063 grub]# echo $?
> > 1
> 
> I guess that is right behavior, then
>       xen_loader="multiboot"
>        module_loader="module"
> 
>  /boot/xen-4.9.0.gz is a xen binary for x86, right?

Correct. I also tested it with an xen.efi which was built for ARM (I copied
it in /boot/ directroy), and it created an proper entry for it:

xen_hypervisor  /xen.efi placeholder dom0_max_vcpus=2 dom0_mem=max:2G loglvl=all guest_loglvl=all console=com1 com1=115200,8n1 iommu=verbose,debug scan=ucode conring_size=2097152  ${xen_rm_opts}

en_module      /vmlinuz-4.13.0-0.rc5.git1.1.fc27.x86_64 placeholder root=/dev/mapper/fedora_tst063-root ro rd.lvm.lv=fedora_tst063/root rd.lvm.lv=fedora_tst063/swap loglevel=8 console=hvc0

...

Naturally I didn't try to boot it as it would most surely not work.
> 
> >
> > will result in 20_linux_xen exciting without continuing
> > and also causing grub2-mkconfig to stop processing.
> 
> maybe we are using different shell?  are you using ash?


[root@tst063 fedora]# head -2 `which grub2-mkconfig` 
#! /bin/sh
set -e

And the upstream grub shows:

[root@tst063 grub]# head -2 ./util/grub-mkconfig.in
#! /bin/sh
set -e


I am assuming you are using ARM, in which case I would recommend you
just copy xen.gz (compiled for x86) in your /boot directory. You should
get a similar failure condition as I got.

> 
> >
> > As in:
> >
> > [root@tst063 ~]#
> >
> > And no more.
> >
> > This patch wraps the invocation of grub-file to be a in subshell
> > and to process the return value in a conditional. That fixes
> > the issue.
> >
> > RH-BZ 1486002: grub2-mkconfig does not work if xen.gz is installed.
> > CC: Fu Wei <fu.wei@linaro.org>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> > ---
> >  util/grub.d/20_linux_xen.in | 9 ++++-----
> >  1 file changed, 4 insertions(+), 5 deletions(-)
> >
> > diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
> > index c002fc9..083bcef 100644
> > --- a/util/grub.d/20_linux_xen.in
> > +++ b/util/grub.d/20_linux_xen.in
> > @@ -206,13 +206,12 @@ while [ "x${xen_list}" != "x" ] ; do
> >      if [ "x$is_top_level" != xtrue ]; then
> >         echo "  submenu '$(gettext_printf "Xen hypervisor, version %s" "${xen_version}" | grub_quote)' \$menuentry_id_option 'xen-hypervisor-$xen_version-$boot_device_id' {"
> >      fi
> > -    $grub_file --is-arm64-efi $current_xen
> > -    if [ $? -ne 0 ]; then
> > -       xen_loader="multiboot"
> > -       module_loader="module"
> > -    else
> > +    if ($grub_file --is-arm64-efi $current_xen); then
> >         xen_loader="xen_hypervisor"
> >         module_loader="xen_module"
> > +    else
> > +       xen_loader="multiboot"
> > +       module_loader="module"
> >      fi
> >      while [ "x$list" != "x" ] ; do
> >         linux=`version_find_latest $list`
> > --
> > 2.1.4
> >
> 
> 
> 
> -- 
> Best regards,
> 
> Fu Wei
> Software Engineer
> Red Hat