Re: [Xen-devel] [v6][PATCH 0/7] xen: reserve RMRR to avoid conflicting MMIO/RAM

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.09.14 at 11:39, <tiejun.chen@xxxxxxxxx> wrote:
> #1: In case of creating a VM, we may use global flag to make sure our 
> original codes work indeed. It should be easy and especially I guess we 
> can't check any conflict directly here since those memory info, 
> RAM/MMIO/others, don't be filled completely, right?

This part will probably need fully dealing with in the tools, with the
hypervisor only refusing to set up conflicting P2M entries (as iirc
you're already doing).

> #2: In case of a running VM, we can check if any overlapping exist then 
> determine what's next. Often we should drop to attach such a conflicting 
> device.

This one I would guess would benefit from the tools doing the checking
if they can, but perhaps the hypervisor is in a better position to do this.
If I'm right with this, at the tools level it would need to be made certain
that this doesn't end up in a cryptic and/or well hidden error messages,
leaving the operator to guess what went wrong.

Jan


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