[edk2-devel] [PATCH] OvmfPkg: Update I/O port related to ACPI devices for CloudHv

[Boeuf, Sebastien]

On Mon, 2022-08-15 at 15:49 +0200, Gerd Hoffmann wrote:
> On Thu, Aug 11, 2022 at 02:40:57PM +0200, Boeuf, Sebastien wrote:
> > From: Sebastien Boeuf <sebastien.boeuf at intel.com>
> > 
> > Both ACPI shutdown and ACPI PM timer devices has been moved to
> > different
> > port addresses in the latest version of Cloud Hypervisor. These
> > changes
> > need to be reflected on the OVMF firmware.
> 
> Can this be detected by the guest somehow, so the firmware can work
> with
> both old+new cloudhv?

This information is provided through the FADT/FACP as well, which is
where the OS retrieves it.

> 
> Requiring lockstep updates tends to be painful, so we try avoid that
> with qemu ...

Yes I understand. We've been kind of forced to update these addresses
to match the ones used by QEMU since they had already been authorized
in the context of TDX. It's just easier for everybody.

> 
> (just a suggestion, not an objection)
> 
> Acked-by: Gerd Hoffmann <kraxel at redhat.com>
> 
> take care,
>   Gerd
> 
> 
> 
> 
> 
> 

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