linux-kernel - Re: x86.git: mtrr trimming removes all memory under kvm

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Message-ID: <p738x2e9nyk.fsf@bingen.suse.de>
Date:	Fri, 25 Jan 2008 11:52:35 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Yinghai Lu <Yinghai.Lu@....COM>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: x86.git: mtrr trimming removes all memory under kvm

Yinghai Lu <Yinghai.Lu@....COM> writes:
>  
> +	/* Doesn't apply to memory < 4GB */
> +	if (end_pfn <= (0xffffffffUL >> PAGE_SHIFT))
> +		return 0;

I don't think this makes sense to move outside the AMD workaround
because the normal MTRRs don't have an implicit hidden 4GB semantics.

-Andi
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