linux-kernel - Re: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support

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Message-ID: <86802c440807112016k38c8161aq143463ee57b24c35@mail.gmail.com>
Date:	Fri, 11 Jul 2008 20:16:03 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Suresh Siddha" <suresh.b.siddha@...el.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"steiner@....com" <steiner@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jeremy@...p.org" <jeremy@...p.org>
Subject: Re: [patch 00/26] x64, x2apic/intr-remap: Interrupt-remapping and x2apic support

1. wonder if x2apic can be use with uniprocessor.

in APIC_init_uniprocessor, it will try to enable x2apic, but later

apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid));

but SET_APIC_ID is still for xapic version. so need to GET_APIC_ID,
SET_APIC_ID for different
genapic like 32bit.

2 check_x2apic is called in setup_arch, but it only set apic_ops,
and genapic still not changed, aka apic_flat...
wonder if you need to call setup_apic_routing to set genapic.

otherwise read_apic_id could have use the one from apic_flat....need
to shift......

3.or move read_apic_id to apic_ops intead...together with GET_APIC_ID too.
but 32bit version seems like to put GET_APIC_ID with genapic...

which one is better? 2 or 3

YH
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