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In-Reply-To: <CACPK8XdmbXK4CVfydO5yq4Qka--wT1fR-vuqFKD_rg29fAquMA@mail.gmail.com>
From: "Bruce Mitchell" <Bruce.Mitchell@ibm.com>
To: Joel Stanley <joel@jms.id.au>
Date: Wed, 24 Feb 2021 17:33:22 +0000
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Subject: RE: My kexec test patches for OpenBMC
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-----"openbmc" <openbmc-bounces+bruce.mitchell=3Dibm.com@lists.ozlabs.org> =
wrote: -----

>To: Bruce Mitchell <Bruce.Mitchell@ibm.com>
>From: Joel Stanley
>Sent by: "openbmc"
>Date: 02/24/2021 00:04
>Cc: Andrew Jeffery <andrew@aj.id.au>, OpenBMC Maillist
><openbmc@lists.ozlabs.org>
>Subject: [EXTERNAL] Re: My kexec test patches for OpenBMC
>
>On Fri, 19 Feb 2021 at 00:53, Bruce Mitchell
><Bruce.Mitchell@ibm.com> wrote:
>>
>> Hello Joel,
>>
>> Per your request yesterday, I am emailing the details of my
>kexec/kdump development efforts.
>
>Thanks. Here's what I tested:
>
>https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A=5F=5Fgithub.com=5Fsh
>enki=5Flinux=5Fcommits=5Fast2600-2Dkexec&d=3DDwIFaQ&c=3Djf=5FiaSHvJObTbx-s=
iA1Z
>Og&r=3DXYNAOU-BEndJr70kO1xkYnetCkaomJrlYQm5DudYzNc&m=3DoX=5FdPGCu4X3pBZl
>Dw0XYgu4z-3G1JebwP-IvlNbEMDE&s=3DgT3O534rB4ZDIPbf6Z78bKCR=5Fop-JR1uYcv
>bd3z18RA&e=3D
>
>>
>> I am running QEMU
>>
>> qemu-system-arm --version
>> QEMU emulator version 5.2.0 (v5.1.0-3479-g27ca38d3db)
>
>That looks fine. I'm using cedric's tree, but anything that will
>boot
>your kernel is fine.

I believe I am using C=C3=A9dric's tree as well.
https://github.com/legoater/qemu.git
commit 27ca38d3db4a35da977cc89d52541ea12e1ba9c4 (HEAD -> aspeed-5.2, origin=
/aspeed-5.2, origin/HEAD)

>
>> qemu-system-arm -d cpu=5Freset -M tacoma-bmc -kernel
>/tmp/tmp.y2fpdAXM1h.kernel -dtb /tmp/tmp.BWkadwNbTf.dtb -initrd
>/tmp/tmp.jRpFbzfpBs.initrd -drive
>file=3Dobmc-phosphor-image-witherspoon-tacoma.wic,if=3Dsd,format=3Draw,i
>ndex=3D2 -net nic -net
>user,hostfwd=3D:127.0.0.1:2222-:22,hostfwd=3D:127.0.0.1:2443-:443,host
>name=3Dqemu -nographic -append "crashkernel=3D64M
>console=3DttyS4,115200n8 rootwait root=3DPARTLABEL=3Drofs-a"
>
>You could simplify your qemu setup if you want. Here's how I
>tested:
>
> $ qemu-system-arm -M tacoma-bmc -nographic -net nic -nic
>user,hostfwd=3D::2222-:22,tftp=3D/srv/tftp/ -kernel
>aspeed-g5-dev/arch/arm/boot/zImage -dtb
>aspeed-g5-dev/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dtb -initrd
>~/dev/kernels/misc/rootfs.cpio.xz
>
>This uses a small initramfs with the kexec utility, and has a copy
>of
>the kernel, initrd and dtb inside to make testing easy.
>
>Or, if you want, you can copy files into the system over the ssh
>port:
>
>I have this in my ~/.ssh/config:
>
>Host qemu
> Hostname localhost
> Port 2222
> User root
> UserKnownHostsFile /dev/null
> StrictHostKeyChecking no
>
>And then you can use scp like this:
>
>scp aspeed-g5-dev/arch/arm/boot/zImage
>aspeed-g5-dev/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dtb
>/home/joel/dev/kernels/misc/rootfs.cpio.xz qemu:
>
>> From OpenBMC within QEMU I am using the following to test kexec
>>
>> kexec -d -l /home/kexec=5Ffiles/tmp.y2fpdAXM1h.kernel
>--initrd=3D/home/kexec=5Ffiles/tmp.jRpFbzfpBs.initrd
>--dtb=3D/home/kexec=5Ffiles/tmp.BWkadwNbTf.dtb --append=3D"earlycon
>console=3DttyS4,115200n8 rootwait root=3DPARTLABEL=3Drofs-a 1 maxcpus=3D1
>reset=5Fdevices"
>> kexec -d -e
>
>Here's how I was running it:
>
># kexec -l zImage --dtb aspeed-bmc-opp-tacoma.dtb --initrd
>rootfs.cpio.xz
># kexec -e
>
>I haven't set a new command line, so it uses the command line from
>the
>device tree (console=3DttyS4,115200n8).
>
>With my patch we will not get the secondary CPU:
>
>[ 0.039517] ASPEED AST2600 rev A1 (05010303)
>[ 0.042030] smp: Bringing up secondary CPUs ...
>[ 1.163950] CPU1: failed to come online
>[ 1.167999] smp: Brought up 1 node, 1 CPU
>[ 1.168164] SMP: Total of 1 processors activated (2250.00
>BogoMIPS).
>
>That should be the next step in working on the kexec patches. We
>want
>the secondary CPU to be in a state such that the new kernel can
>take
>control as it would in a firmware boot.
>
>Note that this didn't require any changes to the system beyond the
>kernel patch. I'm using the same defconfig as we have in the tree.
>
>Cheers,
>
>Joel
>
>

I had only found examples that had changed the kernel config
so I changed defconfig to match. I'll try without changing it.


Thank Joel for all your suggestions.

--
Bruce