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Re: [Qemu-ppc] commit 08521e2 breaks SLOF usb boot

From: Paolo Bonzini
Subject: Re: [Qemu-ppc] commit 08521e2 breaks SLOF usb boot
Date: Fri, 19 Jul 2013 14:50:44 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7

Il 14/06/2013 12:32, Nikunj A Dadhania ha scritto:
> Nikunj A Dadhania <address@hidden> writes:
>> commit 08521e28c7e6e8cc1f53424a0f845f58d2ed9546
>> Author: Paolo Bonzini <address@hidden>
>> Date:   Fri May 24 12:54:01 2013 +0200
>>     memory: add big endian support to access_with_adjusted_size
>>     This will be used to split 8-byte access down to two four-byte accesses.
>>     Reviewed-by: Richard Henderson <address@hidden>
>>     Signed-off-by: Paolo Bonzini <address@hidden>
>> If I hack the above funniness in my USB EHCI driver, somewhere down the
>> qemu crashes at code introduced by this patch:
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x0000000000000000 in ?? ()
>> (gdb) bt
>> #0 0x0000000000000000 in ?? ()
>> #1 0x00005555557a0ea4 in access_with_adjusted_size (address@hidden, 
>> address@hidden, address@hidden, access_size_min=<optimized out>, 
>> access_size_max=<optimized out>,
>> access=0x5555557a1f80 <memory_region_oldmmio_write_accessor>, 
>> opaque=0x5555567f8ab8) at /home/nikunj/work/power/code/qemu/memory.c:396
>> #2 0x00005555557a5ebb in memory_region_dispatch_write (size=1, data=0, 
>> addr=12, mr=0x5555567f8ab8) at /home/nikunj/work/power/code/qemu/memory.c:998
>> Reverting this, I can safely boot using a usb-storage device put on ehci 
>> controller.
> Just reverting this patch does not help though, i will need to figure
> which all commits are bad.

Hi Nikunj,

can you try the attached patch?

Alexey, with some luck it may even fix virtio-blk too.


Attachment: bigendian.patch
Description: Text Data

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