Re: [PATCH part4 2/4] x86, acpica, acpi: Try to find if SRAT is overridedearlier.

From: Tang Chen
Date: Fri Aug 09 2013 - 05:42:50 EST

On 08/09/2013 12:29 AM, Yinghai Lu wrote:

Please check if you can reuse first half of my patchset, so find and copy
override table earlier. the copied acpi tables could be near kernel code range.

I don't think we need to do the finding step at that early time, in
head64.c stage.

Before pagetables are setup, we can use early_ioremap() to map the
memory we want to access. We don't need to use phys addr. We can do
it in setup_arch(), which has nothing to do with 32bit or 64bit.

Move finding in head64.c stage could help xen/dom0 a bit.
as Konrad is working on patchset with acpi override in xen hypervisor.
We can avoid override acpi table two times. Esp xen like to change

Would you please give some more info about this, and explain why finding
override tables in head64.c stage is helpful for xen ?


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