Re: [Xen-devel] [PATCH 09/13] xen: check for kernel memory conflicting with memory layout

[Juergen Gross]

On 02/19/2015 06:36 PM, David Vrabel wrote:
> On 18/02/2015 06:52, Juergen Gross wrote:
> > Checks whether the pre-allocated memory of the loaded kernel is in
> > conflict with the target memory map. If this is the case, just panic
> > instead of run into problems later.
>
> What ensures this doesn't actually happen?

Nothing.

We have basically three options here:

- Die early (my patch).
- Issue a warning that the critical situation has been detected and hope
  for the best by not doing the remap, but probably run into strange
  situations when the discrepancy between E820 map and memory usage is
  becoming problematic.
- Do the remap like today and die eventually when the relocated page is
  used for p2m/m2p translations (no real option).

Juergen

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