linux-kernel - Re: linux-next: qemu boot failures with today's linux-next

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Date:   Mon, 15 Oct 2018 23:45:10 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: qemu boot failures with today's linux-next

Stephen Rothwell <sfr@...b.auug.org.au> writes:
> Hi all,
>
> Today's linux-next tree does not boot in qemu (with kvm or without).
> Here is the (non-kvm) boot log (the kvm one is basically the same):
>
> ------------------------------------------------------
...
>   Welcome to Open Firmware
>
>   Copyright (c) 2004, 2017 IBM Corporation All rights reserved.
>   This program and the accompanying materials are made available
>   under the terms of the BSD License available at
>   http://www.opensource.org/licenses/bsd-license.php
>
> Booting from memory...
> OF stdout device is: /vdevice/vty@...00000
> Preparing to boot Linux version 4.19.0-rc7 (sfr@ash) (gcc version 8.2.0 (Debian 8.2.0-4)) #2 SMP Mon Oct 15 18:53:28 AEDT 2018
                                  ^^^^^^^^^^
                                  I assume that's wrong, this is actually linux-next you're booting?


> Detected machine type: 0000000000000101
> command line: 
> Max number of cores passed to firmware: 2048 (NR_CPUS = 2048)
> Calling ibm,client-architecture-support... done
> memory layout at init:
>   memory_limit : 0000000000000000 (16 MB aligned)
>   alloc_bottom : 0000000001640000
>   alloc_top    : 0000000030000000
>   alloc_top_hi : 0000000080000000
>   rmo_top      : 0000000030000000
>   ram_top      : 0000000080000000
> instantiating rtas at 0x000000002fff0000... done
> prom_hold_cpus: skipped
> copying OF device tree...
> Building dt strings...
> Building dt structure...
> Device tree strings 0x0000000001850000 -> 0x0000000001850a02
> Device tree struct  0x0000000001860000 -> 0x0000000001870000
> Quiescing Open Firmware ...
> Booting Linux via __start() @ 0x0000000000400000 ...
> ------------------------------------------------------
>
> I have no idea what may have caused this.

If you git Ctrl-a-c you should get the qemu prompt. Then you can run
'info registers' to print the regs and maybe see where it's stuck.

And/or build with EARLY_DEBUG_LPAR to get early console output.

cheers