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From: Tang Chen <tangchen@cn.fujitsu.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Bob Moore <robert.moore@intel.com>, Lv Zheng <lv.zheng@intel.com>,
	"Rafael J. Wysocki" <rjw@sisk.pl>, Len Brown <lenb@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tejun Heo <tj@kernel.org>, Thomas Renninger <trenn@suse.de>,
	Jiang Liu <jiang.liu@huawei.com>,
	Zhang Yanfei <zhangyanfei@cn.fujitsu.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>
Subject: Re: [PATCH part4 2/4] x86, acpica, acpi: Try to find if SRAT is overrided earlier.
Date: Fri, 09 Aug 2013 17:41:14 +0800	[thread overview]
Message-ID: <5204B93A.6030409@cn.fujitsu.com> (raw)
In-Reply-To: <CAE9FiQXUS9+heHagD45WAyO22NiGDMo3j2JumzvscypVhnjn9A@mail.gmail.com>

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.


  reply	other threads:[~2013-08-09  9:42 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-08  9:41 [PATCH part4 0/4] Parse SRAT memory affinities earlier Tang Chen
2013-08-08  9:41 ` Tang Chen
2013-08-08  9:41 ` [PATCH part4 1/4] x86: Make get_ramdisk_{image|size}() global Tang Chen
2013-08-08  9:41   ` Tang Chen
2013-08-12 14:25   ` Tejun Heo
2013-08-12 14:25     ` Tejun Heo
2013-08-08  9:41 ` [PATCH part4 2/4] x86, acpica, acpi: Try to find if SRAT is overrided earlier Tang Chen
2013-08-08  9:41   ` Tang Chen
2013-08-08 16:29   ` Yinghai Lu
2013-08-09  9:41     ` Tang Chen [this message]
2013-08-09 23:34       ` Yinghai Lu
2013-08-12 12:28         ` Tang Chen
2013-08-08  9:41 ` [PATCH part4 3/4] x86, acpica, acpi: Try to find SRAT in firmware earlier Tang Chen
2013-08-08  9:41   ` Tang Chen
2013-08-08  9:41 ` [PATCH part4 4/4] x86, acpi, numa, mem_hotplug: Find hotpluggable memory in SRAT memory affinities Tang Chen
2013-08-08  9:41   ` Tang Chen
2013-08-08 16:41   ` Yinghai Lu
2013-08-08 16:41     ` Yinghai Lu
2013-08-09  9:32     ` Tang Chen
2013-08-09  9:32       ` Tang Chen
2013-08-09 23:39       ` Yinghai Lu
2013-08-09 23:39         ` Yinghai Lu
2013-08-09 23:43         ` H. Peter Anvin
2013-08-09 23:43           ` H. Peter Anvin
2013-08-09 23:53           ` Yinghai Lu
2013-08-09 23:53             ` Yinghai Lu
2013-08-09 23:56             ` H. Peter Anvin
2013-08-09 23:56               ` H. Peter Anvin
2013-08-10  0:12               ` Yinghai Lu
2013-08-10  0:12                 ` Yinghai Lu

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