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From: "Sebastian Herbszt" <herbszt@gmx.de>
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Date: Wed, 24 Jul 2013 20:38:07 +0200
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Subject: Re: [Qemu-devel] APM regression since v1.3.0-408-g9ee59f3
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org

Gerd Hoffmann wrote:
> On 07/03/13 22:25, Sebastian Herbszt wrote:
>> Commit 9ee59f3 ("pc: remove bochs bios debug ports") broke the APM
>> interface
>> between QEMU and Bochs BIOS/SeaBIOS. Without APM support older guests
>> are no longer able to power off the VM. This regression also affects
>> older machine
>> types like pc-1.2.
> 
> --verbose please.  Which guest?  Which firmware?

The guest is syslinux. Its poweroff module [1] uses the APM interface.
I'am also no longer able to power off linux (2.6.20) with acpi=off.

Firmware is SeaBIOS 1.7.2.

> ACPI poweroff with seabios works just fine.  If APM support in seabios
> uses something else it should be switched to use the same hardware ports
> ACPI uses for poweroff (some piix4 pm device register I think) instead
> of the debug ports which where never meant to be used that way.

SeaBIOS uses the same QEMU / BIOS interface as Bochs BIOS (port 0x8900).
This interface was removed by commit 9ee59f3.

> Does bochs bios run on recent qemu versions in the first place?

Last time I checked it did, but "recent" is relative.

[1] http://www.syslinux.org/archives/2013-July/020367.html

Sebastian