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Re: [Qemu-devel] SeaBIOS regression

From: John Snow
Subject: Re: [Qemu-devel] SeaBIOS regression
Date: Wed, 6 Feb 2019 12:29:46 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 2/5/19 4:47 AM, Thomas Huth wrote:
> On 2019-02-05 10:42, Gerd Hoffmann wrote:
>> On Tue, Feb 05, 2019 at 10:31:24AM +0100, Thomas Huth wrote:
>>> On 2019-02-05 08:52, Gerd Hoffmann wrote:
>>>> On Mon, Feb 04, 2019 at 04:10:37PM +0100, Thomas Huth wrote:
>>>>>  Hi Gerd,
>>>>> I noticed that certain FreeDOS images are not working correctly anymore
>>>>> with the current version of QEMU, for example
>>>>> http://www.qemu-advent-calendar.org/2016/download/day10.tar.xz ... It
>>>>> aborts with:
>>>>>  Error reading from drive C: DOS area: write-protection violation 
>>>>> attempted
>>>>> I've bisected the issue, and it has apparently been introduced with:
>>>>>  cd1bfd5ef336166b275a09dc9842542bf5e63ae3
>>>>>  seabios: update bios and vgabios binaries
>>>>> Any idea what might be going wrong here?
>>>> Hmm, no.  bisect seabios?
>>> I haven't bisected yet, but it seems to be related to CONFIG_ATA_DMA=y
>>> in our roms/config.seabios-128k config file. When I switch that to "n",
>>> then the old FreeDOS disks are working again...
>> Hmm, guess I should turn that off again on the next update (there will
>> be a seabios 1.12.1 release before qemu 4.0).
> Ah, right, I just noticed that this has just been enabled in QEMU for
> the 3.0 release, where the problem occurred for the first time. So this
> switch is likely the culprit, not a change in SeaBIOS. I'd also vote to
> revert commit eda553a442e94d now.
>  Thomas

If you enable the tracing in hw/ide/core, does it say anything that
looks interesting? I'm wondering if there's some deficiency there.

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