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s390 boot testing #232

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tpimh opened this issue Feb 11, 2020 · 16 comments · May be fixed by #327
Open

s390 boot testing #232

tpimh opened this issue Feb 11, 2020 · 16 comments · May be fixed by #327
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enhancement New feature or request help wanted Extra attention is needed

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@tpimh
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tpimh commented Feb 11, 2020

Let's continue discussion from #229.

Quick summary:

  • QEMU actually can emulate processors newer than Z900 (Debian Buster has qemu 3.1.0 which should emulate IBM machines up to z12)
  • Buildroot dropped support for s390 back in 2009 (gentoo netboot initramfs may be an alternative)
  • When booting (qemu-system-s390x -m 512m -machine s390-ccw-virtio -initrd images/s390/rootfs.cpio -display none -serial mon:stdio -kernel linux/arch/s390/boot/bzImage) there was a kernel fault: S390 support #229 (comment)
@tpimh tpimh added enhancement New feature or request help wanted Extra attention is needed labels Feb 11, 2020
@tpimh tpimh mentioned this issue Apr 28, 2020
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@nickdesaulniers
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@tpimh can you please find the commit to buildroot that dropped s390 support as reference?

@tpimh
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tpimh commented Jul 9, 2020

buildroot/buildroot@b24c321

@nickdesaulniers
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@groeck has s390 images: https://github.com/groeck/linux-build-test/tree/master/rootfs/s390

Not sure if they auto shutdown a machine or not, but we should try them out!

@nickdesaulniers
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@groeck also reverted the removal of s390 from his fork of buildroot: groeck/buildroot@2cf1334

Maybe we should use that!?

@nickdesaulniers
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cc @nathanchance

@nathanchance
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We could. However, I think the root file system is a moot point until we can actually get the kernel to start: ClangBuiltLinux/boot-utils#11 (comment)

@groeck
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groeck commented Sep 10, 2020

WFM, with my scripts at github (see above)

@shenki
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shenki commented Sep 16, 2020

FYI, an IBMer is submitting buildroot support for s390 upstream: http://patchwork.ozlabs.org/project/buildroot/list/?series=201991

@eaibmz
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eaibmz commented Sep 25, 2020

IBM s390x and Z arch has officially landed today in buildroot master 😄

@nickdesaulniers
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@eaibmz thank you so much for the work that went into adding s390x buildroot support! I owe you a 🍺 !

It looks like from our QEMU boot test repo, we're using buildroot release 2020.02.
https://github.com/ClangBuiltLinux/boot-utils/blob/master/buildroot/rebuild.sh#L42

So once we know the latest release that contains support, we can easily update that line to make use of the newer buildroot release. It looks like the latest release is 2020.08 which was last modified 2020-09-01. It looks like v3 was submitted 2020-09-16, so it looks like we'll need to wait for the 2020.09 release (or one of the 2020.09-rc* release candidates) of buildroot. I don't want to use the snapshot. Does that sound like the correct version?

@nickdesaulniers
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It looks like 2020.08.1 was released on 2020-10-12. We should be able to use that.

@nickdesaulniers nickdesaulniers mentioned this issue Oct 16, 2020
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nickdesaulniers added a commit to ClangBuiltLinux/boot-utils that referenced this issue Oct 16, 2020
@nickdesaulniers
add s390 image
cd9d0a0 
Link: ClangBuiltLinux/continuous-integration#232
Signed-off-by: Nick Desaulniers <[email protected]>
nickdesaulniers added a commit to ClangBuiltLinux/boot-utils that referenced this issue Oct 16, 2020
@nickdesaulniers
add s390 image
082ba8c 
Link: ClangBuiltLinux/continuous-integration#232
Signed-off-by: Nick Desaulniers <[email protected]>
nickdesaulniers added a commit that referenced this issue Oct 16, 2020
@nickdesaulniers
boot test s390
b7ef385 
Now that we have the buildroot image, we can boot test.

Fixes: #232
Signed-off-by: Nick Desaulniers <[email protected]>
@nickdesaulniers nickdesaulniers linked a pull request Oct 16, 2020 that will close this issue
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nickdesaulniers added a commit to ClangBuiltLinux/boot-utils that referenced this issue Oct 17, 2020
@nickdesaulniers
add s390 image
0107669 
Link: ClangBuiltLinux/continuous-integration#232
Signed-off-by: Nick Desaulniers <[email protected]>
@eaibmz
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eaibmz commented Oct 19, 2020 •
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It looks like 2020.08.1 was released on 2020-10-12. We should be able to use that.

I think it was just a bugfix release and it doesn't have s390x support yet.
The next release which shall support s390x is 2020.11, in November 2020.
The s390x was merged on 24. September, after the 2020.08 release, unfortunately.

@nickdesaulniers
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I think it was just a bugfix release and it doesn't have s390x support yet.

Then what image file is in ClangBuiltLinux/boot-utils#26 then? Spooky

@nickdesaulniers
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oh, indeed, the buildroot/src/ dir has nothing that looks s390 related in it...

@eaibmz
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eaibmz commented Oct 20, 2020

This shall work if s390x is present:
ls -l configs/qemu_s390x_defconfig

@eaibmz
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eaibmz commented Oct 20, 2020

I think it was just a bugfix release and it doesn't have s390x support yet.

Then what image file is in ClangBuiltLinux/boot-utils#26 then? Spooky

Indeed, I wonder what you built :-)

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boot test s390 ClangBuiltLinux/continuous-integration
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@shenki @groeck @tpimh @nickdesaulniers @nathanchance @eaibmz