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Re: [PATCH 0/4] xen/arm: Unbreak ACPI

On 28/09/2020 07:47, Masami Hiramatsu wrote:

Hi Masami,

This made progress with my Xen boot on DeveloperBox (
https://www.96boards.org/product/developerbox/ ) with ACPI.

I have reviewed the patch attached and I have a couple of remarks about it.

The STAO table was originally created to allow an hypervisor to hide devices from a controller domain (such as Dom0). If this table is not present, then it means the OS/hypervisor can use any device listed in the ACPI table.

Additionally, the STAO table should never be present in the host ACPI table.

Therefore, I think the code should not try to find the STAO. Instead, it should check whether the SPCR table is present.


Julien Grall



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