linux-kernel - Re: [PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86

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Message-ID: <54DA54FA.7010707@intel.com>
Date:	Tue, 10 Feb 2015 10:59:06 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Toshi Kani <toshi.kani@...com>, akpm@...ux-foundation.org,
	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, arnd@...db.de
CC:	linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org,
	Elliott@...com
Subject: Re: [PATCH v2 5/7] x86, mm: Support huge KVA mappings on x86

On 02/09/2015 02:45 PM, Toshi Kani wrote:
> Implement huge KVA mapping interfaces on x86.  Select
> HAVE_ARCH_HUGE_VMAP when X86_64 or X86_32 with X86_PAE is set.
> Without X86_PAE set, the X86_32 kernel has the 2-level page
> tables and cannot provide the huge KVA mappings.

Not that it's a big deal, but what's the limitation with the 2-level
page tables on 32-bit?  We have a 4MB large page size available there
and we already use it for the kernel linear mapping.
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