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Subject: Re: [Qemu-devel] [PATCH 3/3] memory: Return -1 again on reads from
 unsigned regions
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: peter.maydell@linaro.org, stefanha@redhat.com, qemu-devel@nongnu.org, =?ISO-8859-15?Q?Herv=E9_Poussineau?= <hpoussin@reactos.org>, Anthony Liguori <anthony@codemonkey.ws>, Paolo Bonzini <pbonzini@redhat.com>

Am 29.07.2013 17:01, schrieb Jan Kiszka:
> On 2013-07-29 16:59, Andreas Färber wrote:
>> Am 16.07.2013 17:31, schrieb Paolo Bonzini:
>>> From: Jan Kiszka <jan.kiszka@siemens.com>
>>>
>>> This restore the behavior prior to b018ddf633 which accidentally changed
>>> the return code to 0. Specifically guests probing for register existence
>>> were affected by this.
>>>
>>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>>> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
>>
>> Unfortunately this negatively affects PReP: OpenHack'Ware booting Debian
>> Etch prints:
>>
>> ERROR: WIN_READ_NATIVE_MAX : status 50 != 0x40
>>
>> It does continue if one is patient enough.
>> No problems before this commit.
>>
>> Any ideas, except that OHW may be doing Bad Things?
> 
> Which accesses return different results now, PIO or MMIO? What did they
> return prior to b018ddf633?

Would I have to locally apply Paolo's MMIO tracing patches to find out?
My guess is as good as yours otherwise... ;)

Andreas