Re: [Xen-devel] Bug: Limitation of <=2GB RAM in domU persists with 4.3.0

[Andrew Bobulsky <rulerof@xxxxxxxxx>]

On Thu, Jul 25, 2013 at 8:21 PM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> On Thu, 2013-07-25 at 23:23 +0100, Gordan Bobic wrote:
>> Now, if I am understanding the basic nature of the problem correctly,
>> this _could_ be worked around by ensuring that vBAR = pBAR since in that
>> case there is no room for the mis-mapped memory overwrites to occur. Is
>> that correct?
>
> AIUI (which is not very well...) it's not so much vBAR=pBAR but making
> the guest e820 (memory map) have the same MMIO holes as the host so that
> there can't be any clash between v- or p-BAR and RAM in the guest.
>
>> I guess I could test this easily enough by applying the vBAR = pBAR hack.
>
> Does the e820_host=1 option help? That might be PV only though, I can't
> remember...

Alas, yes.  The man pages list it under "PV Guest Specific Options":
http://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html

You got my hopes up! ;)

Carry on!  I'll be sitting here metaphorically munching popcorn with
anticipation :P

-Andrew

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