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

From: Daniel Kiper
Date: Fri Jan 04 2013 - 09:23:42 EST

On Wed, Jan 02, 2013 at 11:26:43AM +0000, Andrew Cooper wrote:
> On 27/12/12 18:02, Eric W. Biederman wrote:
> >Andrew Cooper<andrew.cooper3@xxxxxxxxxx> writes:
> >
> >>On 27/12/2012 07:53, Eric W. Biederman wrote:
> >>>The syscall ABI still has the wrong semantics.
> >>>
> >>>Aka totally unmaintainable and umergeable.
> >>>
> >>>The concept of domU support is also strange. What does domU support even mean, when the dom0 support is loading a kernel to pick up Xen when Xen falls over.
> >>There are two requirements pulling at this patch series, but I agree
> >>that we need to clarify them.
> >It probably make sense to split them apart a little even.
> >
> >
> Thinking about this split, there might be a way to simply it even more.
> /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.
It should be changed to do that. However, I suppose that
Xen community would not be interested in such changes.

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