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Subject: Re: [PATCH v3 00/16] powerpc/32: Use BATs/LTLBs for STRICT_KERNEL_RWX
To:     Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>, j.neuschaefer@gmx.net
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
References: <cover.1550648295.git.christophe.leroy@c-s.fr>
 <87mumpx68h.fsf@concordia.ellerman.id.au>
 <82af8805-3e2a-cfb3-9df6-d883b50ff460@c-s.fr>
From:   Christophe Leroy <christophe.leroy@c-s.fr>
Message-ID: <e46cf0f8-6227-bb9c-b435-c5dbc23ce71c@c-s.fr>
Date:   Thu, 21 Feb 2019 08:42:20 +0100
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Le 21/02/2019 à 07:31, Christophe Leroy a écrit :
> 
> 
> Le 21/02/2019 à 02:47, Michael Ellerman a écrit :
>> Christophe Leroy <christophe.leroy@c-s.fr> writes:
>>
>>> The purpose of this serie is to:
>>> - use BATs with STRICT_KERNEL_RWX on book3s (See patch 13 for details.)
>>> - use LTLBs with STRICT_KERNEL_RWX on 8xx (See patch 15 for a few 
>>> details.)
>>
>> This doesn't boot qemu-mac99 for me:
>>
>>    spawn ~/src/qemu/ppc-softmmu/qemu-system-ppc -nographic -vga none 
>> -M mac99 -m 1G -kernel build/vmlinux -initrd ppc32-initrd.gz -append 
>> console=ttyPZ0 init=/bin/sh
>>    >> =============================================================
>>    >> OpenBIOS 1.1 [Feb 15 2019 10:05]
>>    >> Configuration device id QEMU version 1 machine id 1
>>    >> CPUs: 1
>>    >> Memory: 1024M
>>    >> UUID: 00000000-0000-0000-0000-000000000000
>>    >> CPU type PowerPC,G4
>>    milliseconds isn't unique.
>>    Welcome to OpenBIOS v1.1 built on Feb 15 2019 10:05
>>    >> [ppc] Kernel already loaded (0x01000000 + 0x00c2c338) (initrd 
>> 0x01d2d000 + 0x007e72f0)
>>    >> [ppc] Kernel command line: console=ttyPZ0 init=/bin/sh
>>    >> switching to new context:
>>    OF stdout device is: /pci@f2000000/mac-io@c/escc@13000/ch-a@13020
>>    Preparing to boot Linux version 
>> 5.0.0-rc2-gcc-8.2.0-00125-g4fcb83ca7936 (michael@ka4) (gcc version 
>> 8.2.0 (Buildroot 2018.11-rc2-00003-ga0787e9)) #724 Thu Feb 21 12:03:14 
>> AEDT 2019
>>    Detected machine type: 00000400
>>    command line:
>>    memory layout at init:
>>      memory_limit : 00000000 (16 MB aligned)
>>      alloc_bottom : 02515000
>>      alloc_top    : 30000000
>>      alloc_top_hi : 40000000
>>      rmo_top      : 30000000
>>      ram_top      : 40000000
>>    copying OF device tree...
>>    Building dt strings...
>>    Building dt structure...
>>    Device tree strings 0x02516000 -> 0x025150a4
>>    Device tree struct  0x02517000 -> 0x3fde7eb0
>>    Quiescing Open Firmware ...
>>    Booting Linux via __start() @ 0x01000000 ...
>>    FAIL! Booting BE pmac32
>>
>>
>> That's pmac32 defconfig ish.
>> I haven't had time to debug it further sorry.
>>
> 
> Ok. I boots fine without the '-m 1G'.
> 
> I'll find out why.
> 

Doesn't boot because it maps memory above total_lowmem.

I'll fix it.

Christophe