Re: [Xen-devel] [PATCH] kexec/x86: Do not map crash kernel area

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Tue, Dec 10, 2013 at 08:22:29AM +0000, Jan Beulich wrote:
> >>> On 09.12.13 at 19:01, Daniel Kiper <daniel.kiper@xxxxxxxxxx> wrote:
> > Do not map crash kernel area. This mapping is not in use anymore.
>
> That description to me reads like it was used before. Was it really?

Probably it was done deliberately but I could not find any references
to this mapping in old kexec code or description in commit messages
why it was done. Or maybe it was mistake...

> I think the issue of it possibly being outside of mappable memory
> has been in existence for quite a while, and hence with the
> description being worded in that way this would be a suitable
> trigger for backporting to the stable trees.

I have done kexec/kdump tests on Xen 4.3.1 without that mapping
and it works without any issue. Hence, I think that we could
backport it safely at least to Xen 4.3. However, I suppose that
it should also work for Xen 4.2.

Daniel

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