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Subject: Re: [PATCH v5 17/17] powerpc/32s: Enable CONFIG_VMAP_STACK
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>, dja@axtens.net,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-mm@kvack.org
References: <cover.1576916812.git.christophe.leroy@c-s.fr>
 <2e2509a242fd5f3e23df4a06530c18060c4d321e.1576916812.git.christophe.leroy@c-s.fr>
 <20200206203146.GA23248@roeck-us.net>
From:   Christophe Leroy <christophe.leroy@c-s.fr>
Message-ID: <c6285f2a-f8f5-0d97-2d80-061da1f1a7fc@c-s.fr>
Date:   Fri, 7 Feb 2020 07:13:37 +0100
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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.

In the mean time, you can still unselect CONFIG_VMAP_STACK in your config.

Christophe