Re: [Xen-devel] [PATCH v3 00/11] xen: Initial kexec/kdumpimplementation

From: Daniel Kiper
Date: Fri Jan 04 2013 - 12:08:40 EST

On Fri, Jan 04, 2013 at 02:41:17PM +0000, Jan Beulich wrote:
> >>> On 04.01.13 at 15:22, Daniel Kiper <daniel.kiper@xxxxxxxxxx> wrote:
> > On Wed, Jan 02, 2013 at 11:26:43AM +0000, Andrew Cooper wrote:
> >> /sbin/kexec can load the "Xen" crash kernel itself by issuing
> >> hypercalls using /dev/xen/privcmd. This would remove the need for
> >> the dom0 kernel to distinguish between loading a crash kernel for
> >> itself and loading a kernel for Xen.
> >>
> >> Or is this just a silly idea complicating the matter?
> >
> > This is impossible with current Xen kexec/kdump interface.
> Why?

Because current KEXEC_CMD_kexec_load does not load kernel
image and other things into Xen memory. It means that it
should live somewhere in dom0 Linux kernel memory.

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