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From: Peter Maydell <peter.maydell@linaro.org>
Date: Thu, 1 Oct 2015 13:39:00 +0100
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Subject: Re: [Qemu-devel] [PATCH v4 4/5] acpi: arm: add fw_cfg device node
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To: Laszlo Ersek <lersek@redhat.com>
Cc: Andrew Jones <drjones@redhat.com>, Matt Fleming <matt.fleming@intel.com>, Eduardo Habkost <ehabkost@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, "Gabriel L. Somlo" <somlo@cmu.edu>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, QEMU Developers <qemu-devel@nongnu.org>, Leif Lindholm <leif.lindholm@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, Shannon Zhao <zhaoshenglong@huawei.com>, Igor Mammedov <imammedo@redhat.com>, =?UTF-8?Q?Marc_Mar=C3=AD?= <markmb@redhat.com>, Kevin OConnor <kevin@koconnor.net>, Richard Henderson <rth@twiddle.net>

On 1 October 2015 at 13:35, Laszlo Ersek <lersek@redhat.com> wrote:
> On 10/01/15 14:22, Gabriel L. Somlo wrote:
>> I'm noticing that even on 32-bit arm there are ACPI tables generated and
>> inserted into fw_cfg, so is there any reason OTHER than lack of firmware
>> support for ACPI not being supported on 32-bit arm ?

This is mostly just that we didn't bother to suppress them for
32-bit boots, though they're useless there.

> I think Ard was speaking about the guest kernel (his pointer certainly
> looks like a kernel repo). With regard to firmware, edk2's
> ArmVirtPkg/ArmVirtQemu.dsc builds just fine for 32-bit ARM guests.
>
> So, it's not a QEMU or guest firmware problem; I think it's a guest
> kernel problem.

Only if you think ACPI support is a requirement. It's not for 32-bit;
there's no compelling reason to implement it there.

thanks
-- PMM