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From: "H. Peter Anvin" <hpa@kernel.org>
To: Bernhard Walle <bwalle@suse.de>
Cc: x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Always use 64 bit addresses for the firmware memory map
Date: Wed, 12 Nov 2008 15:35:49 -0800	[thread overview]
Message-ID: <491B6855.1080609@kernel.org> (raw)
In-Reply-To: <20081112221106.5d9d7801@kopernikus.site>

Bernhard Walle wrote:
> * H. Peter Anvin [2008-11-12 11:59]:
>> I want to make sure, though, that we don't just end up pushing the
>> truncation further down in the code.
> 
> Well, I think that interface should export the BIOS memmap as provided.
> Since E820 does provide 64 bit addresses, that should get exported.
> 
> It should even possible to kexec a PAE kernel from a non PAE kernel ...
> I didn't test, but it could work. But only if the E820 map is correctly
> written in the zero page, which is only the case if we get it correctly.
> 

That's fine, but we do have to check that we don't truncate elsewhere.

	-hpa

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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@kernel.org>
To: Bernhard Walle <bwalle@suse.de>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org
Subject: Re: [PATCH] Always use 64 bit addresses for the firmware memory map
Date: Wed, 12 Nov 2008 15:35:49 -0800	[thread overview]
Message-ID: <491B6855.1080609@kernel.org> (raw)
In-Reply-To: <20081112221106.5d9d7801@kopernikus.site>

Bernhard Walle wrote:
> * H. Peter Anvin [2008-11-12 11:59]:
>> I want to make sure, though, that we don't just end up pushing the
>> truncation further down in the code.
> 
> Well, I think that interface should export the BIOS memmap as provided.
> Since E820 does provide 64 bit addresses, that should get exported.
> 
> It should even possible to kexec a PAE kernel from a non PAE kernel ...
> I didn't test, but it could work. But only if the E820 map is correctly
> written in the zero page, which is only the case if we get it correctly.
> 

That's fine, but we do have to check that we don't truncate elsewhere.

	-hpa

  reply	other threads:[~2008-11-12 23:39 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-12 19:44 [PATCH] Always use 64 bit addresses for the firmware memory map Bernhard Walle
2008-11-12 19:44 ` Bernhard Walle
2008-11-12 19:59 ` H. Peter Anvin
2008-11-12 19:59   ` H. Peter Anvin
2008-11-12 21:11   ` Bernhard Walle
2008-11-12 21:11     ` Bernhard Walle
2008-11-12 23:35     ` H. Peter Anvin [this message]
2008-11-12 23:35       ` H. Peter Anvin
2008-11-13  8:04       ` Bernhard Walle
2008-11-13  8:04         ` Bernhard Walle
2008-11-12 20:16 ` Jeremy Fitzhardinge
2008-11-12 20:16   ` Jeremy Fitzhardinge
2008-11-12 23:34   ` H. Peter Anvin
2008-11-12 23:34     ` H. Peter Anvin
2008-11-13  0:32     ` Jeremy Fitzhardinge
2008-11-13  0:32       ` Jeremy Fitzhardinge
2008-11-13  1:16       ` H. Peter Anvin
2008-11-13  1:16         ` H. Peter Anvin

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