Re: [RFC PATCH 1/2] qemu: Advertise ACPI support for aarch64 guests

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On Wed, 2017-03-08 at 16:00 +0000, Daniel P. Berrange wrote:
> > So far, libvirt has assumed that only x86 supports ACPI,
> > but that's inaccurate since aarch64 supports it too.
> 
> IIUC, it only supports ACPI if using the AAVMF firmware, right ?

My current understanding is that ACPI on aarch64 requires
UEFI, not necessarily AAVMF. I'll admit I haven't really
considered other QEMU-compatible UEFI implementations,
though, assuming they exist.

Laszlo? :)

> I know that is the preferred firmware for aarch64, but IIUC it is
> not a hard requirement by QEMU. So even if we advertize it in the
> capabilities, we might need to still validate during CLI building
> that we're actually using AAVMF firmware.

We currently require that ACPI is available when using UEFI,
even though as mentioned above I believe it should really
be the other way around.

In any case, how would we validate that the pflash file
we're passing to QEMU does indeed contain AAVMF?

-- 
Andrea Bolognani / Red Hat / Virtualization

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