CentOS virt - Sep 2015 - adding xen support to grub2 got segfault running grub2-mkimage

There is some interest lately in making a self-contained grub2 boot image - call
it pvgrub2, used for booting paravirtual domU in xen where a grub2 config is
installed.
First attempt------------------
I first tried using the grub2*.src.rpm from the C7 vault.
I configured as shown
belowhttps://blog.xenproject.org/2015/01/07/using-grub-2-as-a-bootloader-for-xen-pv-guests/
for headers, I used xen-devel, xen-libs, xen-licenses from a recent build I
didhttp://107.185.144.55/xen/cent7/dom0/RPMS/stable-4.5/mock/
this gave a segfault from grub2-mkimage with a cmdline
like/usr/bin/grub2-mkimage? -O x86_64-xen?? -C auto? -d /usr/lib/grub/x86_64-xen
-c ./grub-bootstrap.cfg???? -m ./memdisk.tar???? -o ./grub2-x86_64-xen.bin -v?
ext2 fat file font fshelp gzio halt hashsum help legacycfg linux loadenv
loopback part_dvh part_gpt part_msdos part_plan part_sun xfs xnu_uuid
xnu_uuid_test xzio
the image would finish if I cut down the module list to about 8 or less modules.
This is not enough for a useful image .

Second Attempt----------------In the same build env, I started with the git
clone (see link). Now when running grub-mkimage I included all the modules
in/usr/lib/grub/x86_64-xen/ and the image formed without error and works as
expected as a xen bootloader.
The only difference in the two builds is the size of grubX-mkimage: one is
stripped and the other not.?Using the official grub2 C7 packages failed and a
rogue build from git worked.
regards,PryMar56





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On Mon, Sep 14, 2015 at 6:49 AM, Mark Pryor <tlviewer at yahoo.com>
wrote:
> There is some interest lately in making a self-contained grub2 boot image -
> call it pvgrub2, used for booting paravirtual domU in xen where a grub2
> config is installed.
>
> First attempt
> ------------------
> I first tried using the grub2*.src.rpm from the C7 vault.
>
> I configured as shown below
>
https://blog.xenproject.org/2015/01/07/using-grub-2-as-a-bootloader-for-xen-pv-guests/
>
> for headers, I used xen-devel, xen-libs, xen-licenses from a recent build I
> did
> http://107.185.144.55/xen/cent7/dom0/RPMS/stable-4.5/mock/
>
> this gave a segfault from grub2-mkimage with a cmdline like
> /usr/bin/grub2-mkimage  -O x86_64-xen   -C auto  -d
/usr/lib/grub/x86_64-xen
> -c ./grub-bootstrap.cfg     -m ./memdisk.tar     -o ./grub2-x86_64-xen.bin
> -v  ext2 fat file font fshelp gzio halt hashsum help legacycfg linux
loadenv
> loopback part_dvh part_gpt part_msdos part_plan part_sun xfs xnu_uuid
> xnu_uuid_test xzio
>
> the image would finish if I cut down the module list to about 8 or less
> modules. This is not enough for a useful image .
>
> Second Attempt
> ----------------
> In the same build env, I started with the git clone (see link). Now when
> running grub-mkimage I included all the modules in
> /usr/lib/grub/x86_64-xen/ and the image formed without error and works as
> expected as a xen bootloader.
>
> The only difference in the two builds is the size of grubX-mkimage: one is
> stripped and the other not.
>  Using the official grub2 C7 packages failed and a rogue build from git
> worked.
>
> regards,
> PryMar56
>
>
>
>
>
>
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
>

http://107.185.144.55/xen/cent7/grub2/
I have properly packaged a split off of xen support in grub2 for Centos 7.
No more segfaults.
I have not seen anyone attempt to package this starting with the official C7
SRPM from the vaults.
 


     On Sunday, September 13, 2015 10:50 PM, Mark Pryor <tlviewer at
yahoo.com> wrote:
   

 There is some interest lately in making a self-contained grub2 boot image -
call it pvgrub2, used for booting paravirtual domU in xen where a grub2 config
is installed.
First attempt------------------
I first tried using the grub2*.src.rpm from the C7 vault.
I configured as shown
belowhttps://blog.xenproject.org/2015/01/07/using-grub-2-as-a-bootloader-for-xen-pv-guests/
for headers, I used xen-devel, xen-libs, xen-licenses from a recent build I
didhttp://107.185.144.55/xen/cent7/dom0/RPMS/stable-4.5/mock/
this gave a segfault from grub2-mkimage with a cmdline
like/usr/bin/grub2-mkimage? -O x86_64-xen?? -C auto? -d /usr/lib/grub/x86_64-xen
-c ./grub-bootstrap.cfg???? -m ./memdisk.tar???? -o ./grub2-x86_64-xen.bin -v?
ext2 fat file font fshelp gzio halt hashsum help legacycfg linux loadenv
loopback part_dvh part_gpt part_msdos part_plan part_sun xfs xnu_uuid
xnu_uuid_test xzio
the image would finish if I cut down the module list to about 8 or less modules.
This is not enough for a useful image .

Second Attempt----------------In the same build env, I started with the git
clone (see link). Now when running grub-mkimage I included all the modules
in/usr/lib/grub/x86_64-xen/ and the image formed without error and works as
expected as a xen bootloader.
The only difference in the two builds is the size of grubX-mkimage: one is
stripped and the other not.?Using the official grub2 C7 packages failed and a
rogue build from git worked.
regards,PryMar56







  
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