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

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Date:	Thu, 12 Sep 2013 14:34:58 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Dave Young <dyoung@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"zohar@...ux.vnet.ibm.com" <zohar@...ux.vnet.ibm.com>,
	"d.kasatkin@...sung.com" <d.kasatkin@...sung.com>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>
Subject: Re: [PATCH 15/16] bootparam: Pass acpi_rsdp pointer in bootparam

On Thu, 2013-09-12 at 14:53 +0200, Borislav Petkov wrote:

> Why userspace part - I'm thinking the kexec'ed kernel would simply add
> the mappings made by SetVirtualAddressMap without calling it. And it
> will know which mappings go to which virtual addresses because we start
> at the -4G virtual address and go downwards and the mappings will have
> the same addresses per UEFI implementation.

The second kernel still needs to be passed a pointer to the EFI tables
and memory map.

-- 
Matthew Garrett <matthew.garrett@...ula.com>