linux-kernel - Re: [RFC 0/2] Delay initializing of large sections of memory

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Message-ID: <CAE9FiQU1kGVNYZ+XUFDG=OaPSZskSOHP8mf0f=pQGEGFd7Yfbw@mail.gmail.com>
Date:	Tue, 25 Jun 2013 12:28:38 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Mike Travis <travis@....com>, Ingo Molnar <mingo@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Nathan Zimmer <nzimmer@....com>, Robin Holt <holt@....com>,
	Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	linux-doc@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/2] Delay initializing of large sections of memory

On Tue, Jun 25, 2013 at 12:09 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> According to Intel SDM, CPU could support 52bits physical addressing.
>>
>> So how linux kernel will handle it? as we only have 48bits virtual addressing.
>>
>
> The Linux kernel will not support more than V-2 bits of physical address
> space for any number V of virtual address bits.

ok, then will need cpu support 57bits virtual addressing, and level 5
page table?

Yinghai
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