linux-kernel - Re: [PATCH 15/16] bootparam: Pass acpi

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Message-ID: <20130913112654.GA12095@x1.alien8.de>
Date:	Fri, 13 Sep 2013 13:26:54 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Young <dyoung@...hat.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, kexec@...ts.infradead.org,
	akpm@...ux-foundation.org, zohar@...ux.vnet.ibm.com,
	d.kasatkin@...sung.com, ebiederm@...ssion.com,
	matthew.garrett@...ula.com
Subject: Re: [PATCH 15/16] bootparam: Pass acpi_rsdp pointer in bootparam

On Fri, Sep 13, 2013 at 03:12:40PM +0800, Dave Young wrote:
> Also the fw_vendor, runtime, tables elements will be fixed up to use
> virtual address after 1st kernel call SetVirtualAddress, so even with
> 1:1 mapping we still need save them and use in kexec kernel.

As I said a couple of times already, 1:1 mapping is a no go.

Concerning the runtime services, we need to pass the UEFI memory map to
the kexec'ed kernel because it needs to know those to start mapping them
from -4G virtual downwards.

-- 
Regards/Gruss,
Boris.
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