linux-kernel - Re: [Fastboot] [PATCH 1/1] Allow i386 crash kernels to handle x86

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Date:	Fri, 16 Mar 2007 17:08:01 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	Ian Campbell <Ian.Campbell@...source.com>,
	Horms <horms@...ge.net.au>, fastboot@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Fastboot] [PATCH 1/1] Allow i386 crash kernels to handle x86_64 dumps

On Fri, Mar 16, 2007 at 07:05:30PM +0900, Magnus Damm wrote:
> On 3/16/07, Vivek Goyal <vgoyal@...ibm.com> wrote:
> >Got a question. When running 32bit dom0 on 64bit hypervisor, which
> >kexec-tools elf loader will kick in? 32bit or 64bit? Looks like in this
> >case 64bit one. But shouldn't it be 32bit as 32bit OS is running and we
> >must be using the kexec-tools binary compiled for 32bit OS? And if 32bit
> >loader kicks in we will not be passing any acpi parameters.
> 
> There is no check to see if the hypervisor is 32 or 64 bits present
> today. So the 32-bit version of kexec-tools will support loading
> images like any other 32-bit kexec-tools.
> 

If that is the case then in prepared elf headers, machine type should
be EM_386 or similar and not EM_X86_64 and Ian shouldn't have run into
the problem at all with vmcore. Am I missing something?

Thanks
Vivek
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