linux-kernel - Re: [PATCH v7 06/27] x86, 64bit: early #PF handler set page table

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Message-ID: <CAE9FiQXrpQtZ7Sq=xfjscKjKzZ6P89uPG0bByER8q48jEgYx_g@mail.gmail.com>
Date:	Tue, 18 Dec 2012 12:43:56 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v7 06/27] x86, 64bit: early #PF handler set page table

On Mon, Dec 17, 2012 at 11:15 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> -v8: we need to keep that handler alive until init_mem_mapping and don't
>      let early_trap_init to trash that early #PF handler.
>      So split early_trap_pf_init out and move it down. - Yinghai

Peter,

looks like moving down early_trap_init would break kgdb.

we could make temporary early pgt cover 1G, and kernel and stop updating later.

please check attached patch.

init_mem_mapping need to be change a little: map BRK at first then switch pgt.

Thanks

Yinghai

Download attachment "hpa_pf_set_page_table_5.patch" of type "application/octet-stream" (18954 bytes)