From: Youquan Song <youquan.song@linux.intel.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Gleb Natapov <gleb@redhat.com>,
Youquan Song <youquan.song@intel.com>,
Sheng Yang <sheng@linux.intel.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Youquan Song <youquan.song@linux.intel.com>
Subject: Re: [PATCH] x86, apic: Enable x2APIC physical when cpu < 256 native
Date: Mon, 29 Jul 2013 13:05:14 -0400 [thread overview]
Message-ID: <20130729170514.GB30371@linux-youquan.bj.intel.com> (raw)
In-Reply-To: <CAE9FiQWbVDRpLUCUTF=Jpmm-nn6kgBYFW25PPTEiPK-R-mX0jA@mail.gmail.com>
> Yes. It would be great, if Youquan can point out where is the intel doc
> about the change.
>
> Also if the patch can move on, hypervisor_x2apic_available() related
> declaration and define
> could be dropped.
Hi Yinghai,
Sorry I do not know the document change but I also do not find the
words/description/explanation that x2APIC physical mode also need interrupt
remapping support when CPU < 256. Of course, X2APIC cluster mode must
has interrupt remapping support.
I have tested many machines, both old and most recent machines and from
desktop to server, x2APIC physical mode works without interrupt
remapping when CPU < 256.
In theory and real test, I do not find any issue about the patch.
In order to make sure the patch without involving unexpected issues beyond
I can understand, I will confirm with our expert about it.
so please pend the patch going to mainline. If the patch can move on, I
think I will also provide other patch changing, like direct EOI.
Thanks
-Youquan
next prev parent reply other threads:[~2013-07-29 5:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-12 1:22 [PATCH] x86, apic: Enable x2APIC physical when cpu < 256 native Youquan Song
2013-07-23 9:17 ` Ingo Molnar
2013-07-24 14:04 ` Youquan Song
2013-07-25 22:01 ` Ingo Molnar
2013-07-29 16:48 ` Youquan Song
2013-07-24 3:55 ` [tip:x86/apic] x86/apic: Enable x2APIC physical mode on native hardware too, when there are fewer than 256 CPUs tip-bot for Youquan Song
2013-07-24 4:24 ` [PATCH] x86, apic: Enable x2APIC physical when cpu < 256 native Yinghai Lu
2013-07-24 6:22 ` Gleb Natapov
2013-07-25 14:05 ` Yinghai Lu
2013-07-29 17:05 ` Youquan Song [this message]
2013-08-14 18:40 ` Youquan Song
2013-08-14 11:11 ` Ingo Molnar
2013-08-17 13:44 ` Youquan Song
2013-08-17 7:42 ` Ingo Molnar
2013-08-17 8:24 ` Borislav Petkov
2013-08-17 9:03 ` Joe Perches
2013-08-17 15:44 ` Borislav Petkov
2013-08-17 16:26 ` Joe Perches
2013-08-18 10:02 ` Borislav Petkov
2013-08-17 19:52 ` Youquan Song
2013-08-19 7:11 ` Ingo Molnar
2013-08-02 19:12 ` Konrad Rzeszutek Wilk
2013-07-24 14:45 ` Konrad Rzeszutek Wilk
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