Re: [Xen-devel] BUG: bad page map under Xen

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Oct 23, 2013 at 04:45:37PM +0100, Jan Beulich wrote:
> >>> Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 10/23/13 5:37 PM >>>
> >On Mon, Oct 21, 2013 at 04:12:56PM +0100, Jan Beulich wrote:
> >> > Were you suggesting a lookup when we scan the PCI devices? 
> >> > (xen_add_device)?
> >> 
> >> That was for PVH, and is obviously fragile, as there can be MMIO
> >> regions not matched by any PCI device's BAR. We could hope for
> >> all of them to be below 4Gb, but I think (based on logs I got to see
> >> recently from a certain vendor's upcoming systems) this isn't going
> >> to work out.
> >
> >This is the patch I had in mind that I think will fix these issues. But
> >I would appreciate testing it and naturally send me the dmesg if possible.
> 
> So this indeed is only about PCI devices (i.e. not taking into account the
> comment I made earlier [above]).

Correct.
What are some of those devices? It would help to understand what those are.

> 
> Further, a brute force loop over all balloon pages seems like a pretty
> bad thing to do when the balloon is rather big.

Sure.
> 
> And finally - did you check that the bus notification happens after resource
> assignment?

They do occur during the normal resource assigment. But I presume you
meant during resource re-assigment?

> 
> Jan
> 

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