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Subject: Re: [PATCH v5 17/17] powerpc/32s: Enable CONFIG_VMAP_STACK
To:     Christophe Leroy <christophe.leroy@c-s.fr>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Paul Mackerras <paulus@samba.org>,
        linuxppc-dev@lists.ozlabs.org, dja@axtens.net
References: <cover.1576916812.git.christophe.leroy@c-s.fr>
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 <20200206203146.GA23248@roeck-us.net>
 <c6285f2a-f8f5-0d97-2d80-061da1f1a7fc@c-s.fr>
 <0f866131-4292-a66b-2637-c34139277486@c-s.fr>
From:   Guenter Roeck <linux@roeck-us.net>
Message-ID: <551bad84-3e80-265b-93ab-25eae4aa9807@roeck-us.net>
Date:   Fri, 7 Feb 2020 05:08:11 -0800
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On 2/7/20 12:28 AM, Christophe Leroy wrote:
> 
> 
> On 02/07/2020 06:13 AM, Christophe Leroy wrote:
>>
>>
>> Le 06/02/2020 à 21:31, Guenter Roeck a écrit :
>>> On Sat, Dec 21, 2019 at 08:32:38AM +0000, Christophe Leroy wrote:
>>>> A few changes to retrieve DAR and DSISR from struct regs
>>>> instead of retrieving them directly, as they may have
>>>> changed due to a TLB miss.
>>>>
>>>> Also modifies hash_page() and friends to work with virtual
>>>> data addresses instead of physical ones. Same on load_up_fpu()
>>>> and load_up_altivec().
>>>>
>>>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>>>
>>> This patch results in qemu boot failures (mac99 with pmac32_defconfig).
>>> Images fail silently; there is no console output. Reverting the patch
>>> fixes the problem. Bisect log is attached below.
>>>
>>> Assuming this was tested on real hardware, am I correct to assume that qemu
>>> for ppc32 (more specifically, qemu's mac99 and g3beige machines) no longer
>>> works with the upstream kernel ?
>>
>> Before submitting the series, I successfully tested:
>> - Real HW with powerpc 8xx
>> - Real HW with powerpc 832x
>> - Qemu's mac99
>>
>> I'll re-check the upstream kernel.
>>
> 
> This is still working for me with the upstream kernel:
> 

Interesting. What is your kernel configuration, your qemu version, and
your qemu command line ?

It works for me with CONFIG_VMAP_STACK=n, but not with pmac32_defconfig.

Thanks,
Guenter