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From: Ingo Molnar <mingo@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>,
	x86@kernel.org, Mario Limonciello <mario_limonciello@dell.com>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH] x86/boot: Reorganize and clean up the BIOS area reservation code
Date: Thu, 21 Jul 2016 11:14:11 +0200	[thread overview]
Message-ID: <20160721091411.GB22986@gmail.com> (raw)
In-Reply-To: <92DA2E2A-BCD9-4198-A983-395A06388688@zytor.com>


* H. Peter Anvin <hpa@zytor.com> wrote:

> We already reserve the first megabyte by default.  There is something really bizarre about this; the bug report simply doesn't seem to make any sense.

Btw., are you sure about this? We do reserve the first 64KB:

config X86_RESERVE_LOW
        int "Amount of low memory, in kilobytes, to reserve for the BIOS"
        default 64
        range 4 640
        ---help---
          Specify the amount of low memory to reserve for the BIOS.

But I cannot find the place that allocates the first 1MB.

Thanks,

	Ingo

  parent reply	other threads:[~2016-07-21  9:14 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-21  1:32 [PATCH] x86/ebda: If the EBDA is in lowmem, reserve only 4k for the EBDA Andy Lutomirski
2016-07-21  8:14 ` [PATCH] x86/boot: Reorganize and clean up the BIOS area reservation code Ingo Molnar
2016-07-21  8:29   ` H. Peter Anvin
2016-07-21  9:11     ` Ingo Molnar
2016-07-21 12:32       ` H. Peter Anvin
2016-07-21  9:14     ` Ingo Molnar [this message]
2016-07-21  8:31   ` Ingo Molnar
2016-07-21 14:58   ` Andy Lutomirski
2016-07-21 16:18     ` Ingo Molnar
2016-07-21 21:08       ` Andy Lutomirski
2016-07-21 21:28         ` H. Peter Anvin
2016-07-21 21:48           ` Andy Lutomirski
2016-07-21 22:45             ` Andy Lutomirski
2016-07-22 13:00               ` Matt Fleming
2016-07-23  1:16                 ` Linus Torvalds
2016-07-26  0:41                 ` Andy Lutomirski

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