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RE: [Xen-devel] Re: [PATCH]: kexec: framework and i386

To: <horms-home@xxxxxxxxxxxx>, "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Re: [PATCH]: kexec: framework and i386
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Sun, 23 Apr 2006 15:33:38 +0100
Cc: Magnus Damm <magnus@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, mark.williamson@xxxxxxxxxxxx
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Thread-topic: [Xen-devel] Re: [PATCH]: kexec: framework and i386
> In summary, for kdump "linux crashdump=64M@16M"
> becomes "xen kdump_megabytes=64 kdump_megabytes_base=16"

Please can you explain a bit about how kdump works, and why a physically
contiguous region with known base address is required. What actually
gets written out in the crash dump and in what format? 

> The other main point to note for users is that while the 
> following transition is possible: xen -> linux.  But xen -> 
> xen and linux -> xen is currently not possible.  This is 
> because kexec-tool, the user-space component of kexec does 
> not understand enough about xen, and thus needs to be 
> enhanced in order to make this possible.

Tim Deegan submitted a patch to add support for multiboot images (such
as Xen) to kexec a couple of years ago, and I believe it has been part
of the standard package for some time.


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