linux-kernel - Re: [PATCH part4 2/4] x86, acpica, acpi: Try to find if SRAT is overrided earlier.

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Message-ID: <5204B93A.6030409@cn.fujitsu.com>
Date:	Fri, 09 Aug 2013 17:41:14 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Bob Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Thomas Renninger <trenn@...e.de>,
	Jiang Liu <jiang.liu@...wei.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH part4 2/4] x86, acpica, acpi: Try to find if SRAT is overrided
 earlier.

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
> DMAR to XMAR.

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

Thanks.

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