[PATCH] Fix ARM multiboot2 breaking Fedora.

[PATCH] Fix ARM multiboot2 breaking Fedora.

[Konrad Rzeszutek Wilk]

Hey,

The first patch:
 [PATCH 1/2] Fix util/grub.d/20_linux_xen.in: Add xen_boot command

is a fix discovered on Fedora rawhide where I was surprised to see that
grub2-mkconfig would not create a configuration file anymore.
See https://bugzilla.redhat.com/show_bug.cgi?id=1486002 for details.


The second patch has been posted in the past
(https://lists.xen.org/archives/html/xen-devel/2017-03/txtCeHTNmz1hZ.txt)

 [PATCH 2/2] Use grub-file to figure out whether multiboot2 should be

and just allows us to multiboot2 instead of multiboot if the binary
supports it.


 util/grub.d/20_linux_xen.in | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

Konrad Rzeszutek Wilk (2):
      Fix util/grub.d/20_linux_xen.in: Add xen_boot command support for aarch64
      Use grub-file to figure out whether multiboot2 should be used for Xen.gz

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

[Konrad Rzeszutek Wilk]

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 example on x86):
+ /usr/bin/grub2-file --is-arm64-efi /boot/xen-4.9.0.gz
[root@tst063 grub]# echo $?
1

will result in 20_linux_xen exciting without continuing
and also causing grub2-mkconfig to stop processing.

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

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

[Konrad Rzeszutek Wilk]

On Mon, Aug 28, 2017 at 02:40:14PM -0400, Konrad Rzeszutek Wilk 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 example on x86):
> + /usr/bin/grub2-file --is-arm64-efi /boot/xen-4.9.0.gz
> [root@tst063 grub]# echo $?
> 1
> 
> will result in 20_linux_xen exciting without continuing
> and also causing grub2-mkconfig to stop processing.
> 
> As in:

git format-patch decided to eat this relevant part:

[root@tst063 grub]# ./grub-mkconfig | tail
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.13.0-0.rc5.git1.1.fc27.x86_64
Found initrd image: /boot/initramfs-4.13.0-0.rc5.git1.1.fc27.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2
Found initrd image: /boot/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
		echo	'Loading Linux 0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 ...'
		linux	/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 root=/dev/mapper/fedora_tst063-root ro single 
		echo	'Loading initial ramdisk ...'
		initrd	/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
	}
}

### END /usr/local/etc/grub.d/10_linux ###

### BEGIN /usr/local/etc/grub.d/20_linux_xen ###

root@tst063 grub]# 

> 
> [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
> 

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

[Daniel Kiper]

On Mon, Aug 28, 2017 at 02:42:18PM -0400, Konrad Rzeszutek Wilk wrote:
> On Mon, Aug 28, 2017 at 02:40:14PM -0400, Konrad Rzeszutek Wilk 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 example on x86):
> > + /usr/bin/grub2-file --is-arm64-efi /boot/xen-4.9.0.gz
> > [root@tst063 grub]# echo $?
> > 1
> >
> > will result in 20_linux_xen exciting without continuing

s/exciting/exiting/?

> > and also causing grub2-mkconfig to stop processing.
> >
> > As in:
>
> git format-patch decided to eat this relevant part:
>
> [root@tst063 grub]# ./grub-mkconfig | tail
> Generating grub configuration file ...
> Found linux image: /boot/vmlinuz-4.13.0-0.rc5.git1.1.fc27.x86_64
> Found initrd image: /boot/initramfs-4.13.0-0.rc5.git1.1.fc27.x86_64.img
> Found linux image: /boot/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2
> Found initrd image: /boot/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
> 		echo	'Loading Linux 0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 ...'
> 		linux	/vmlinuz-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2 root=/dev/mapper/fedora_tst063-root ro single
> 		echo	'Loading initial ramdisk ...'
> 		initrd	/initramfs-0-rescue-ec082ee24aea41b9b16aca52a6d10cc2.img
> 	}
> }
>
> ### END /usr/local/etc/grub.d/10_linux ###
>
> ### BEGIN /usr/local/etc/grub.d/20_linux_xen ###
>
> root@tst063 grub]#

In general LGTM. Though please repost this patch with full commit message?

Daniel

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

[Fu Wei Fu]

Hi  Konrad,

Thanks for your feedback.

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?

>
> 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?

>
> 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

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

[Konrad Rzeszutek Wilk]

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

[PATCH 2/2] Use grub-file to figure out whether multiboot2 should be used for Xen.gz

[Konrad Rzeszutek Wilk]

The multiboot2 is much more preferable than multiboot. Especiall
if booting under EFI where multiboot does not have the functionality
to pass ImageHandler.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
v2: Rebase on top of  d33045ce7ffcb7c1e4a60c14d5ca64b36e3c5abe
---
 util/grub.d/20_linux_xen.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
index 083bcef..29e015b 100644
--- a/util/grub.d/20_linux_xen.in
+++ b/util/grub.d/20_linux_xen.in
@@ -212,6 +212,10 @@ while [ "x${xen_list}" != "x" ] ; do
     else
 	xen_loader="multiboot"
 	module_loader="module"
+	if ($grub_file --is-x86-multiboot2 $current_xen); then
+		xen_loader="multiboot2"
+		module_loader="module2"
+	fi
     fi
     while [ "x$list" != "x" ] ; do
 	linux=`version_find_latest $list`
-- 
2.1.4

Re: [PATCH 2/2] Use grub-file to figure out whether multiboot2 should be used for Xen.gz

[Daniel Kiper]

On Mon, Aug 28, 2017 at 02:40:15PM -0400, Konrad Rzeszutek Wilk wrote:
> The multiboot2 is much more preferable than multiboot. Especiall
> if booting under EFI where multiboot does not have the functionality
> to pass ImageHandler.
>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
> v2: Rebase on top of  d33045ce7ffcb7c1e4a60c14d5ca64b36e3c5abe
> ---
>  util/grub.d/20_linux_xen.in | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
> index 083bcef..29e015b 100644
> --- a/util/grub.d/20_linux_xen.in
> +++ b/util/grub.d/20_linux_xen.in
> @@ -212,6 +212,10 @@ while [ "x${xen_list}" != "x" ] ; do
>      else
>  	xen_loader="multiboot"
>  	module_loader="module"

Could you put these two lines into else below?

> +	if ($grub_file --is-x86-multiboot2 $current_xen); then
> +		xen_loader="multiboot2"
> +		module_loader="module2"

Too much tabs. It should be one tab and four spaces.

Daniel