linux-kernel - Re: [PATCH] x86, x2apic: Preserve high 32-bits of IA32_APIC

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Message-ID: <20110712070531.GD27217@sun>
Date:	Tue, 12 Jul 2011 11:05:31 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Naga Chumbalkar <nagananda.chumbalkar@...com>
Cc:	x86@...nel.org, suresh.b.siddha@...el.com,
	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...e.hu,
	tglx@...utronix.de
Subject: Re: [PATCH] x86, x2apic: Preserve high 32-bits of IA32_APIC_BASE MSR

On Tue, Jul 12, 2011 at 05:59:07AM +0000, Naga Chumbalkar wrote:
> If there's no special reason to zero-out the "high" 32-bits of the IA32_APIC_BASE
> MSR, let's preserve it.
> 
> The x2APIC Specification doesn't explicitly state any such requirement. (Sec 2.2 
> in: http://www.intel.com/Assets/PDF/manual/318148.pdf).
> 
> Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@...com>
> Cc: Suresh Siddha <suresh.b.siddha@...el.com>
> 

Looks like a good idea for me. I've reviewed some additional specs
and even some updates, nothing interesting found.

Reviewed-by: Cyrill Gorcunov <gorcunov@...nvz.org>
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