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.
next prev parent reply other threads:[~2013-08-09 9:42 UTC|newest]
Thread overview: 10+ 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 ` [PATCH part4 1/4] x86: Make get_ramdisk_{image|size}() global Tang Chen
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 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 ` [PATCH part4 4/4] x86, acpi, numa, mem_hotplug: Find hotpluggable memory in SRAT memory affinities Tang Chen
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