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

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Message-ID: <m163rb4v3j.fsf@frodo.ebiederm.org>
Date:	Fri, 11 Jul 2008 20:52:48 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Suresh Siddha" <suresh.b.siddha@...el.com>,
	"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

"Yinghai Lu" <yhlu.kernel@...il.com> writes:

> 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

Z finish untangle SMP support from apic initialization and move the apic
initialization up into init_IRQ.

That is better but is likely the wrong short term approach.

Eric


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