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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Wed, 24 Jul 2013 10:08:13 -0400, Konrad Rzeszutek Wilk 
<konrad.wilk@xxxxxxxxxx> wrote:
> On Tue, Jul 23, 2013 at 11:34:00PM +0100, Gordan Bobic wrote:
> > I just built 4.3.0 in order to get > 2GB of RAM in domU with GPU
> > passthrough without crashes. Unfortunately, the same crashes still
> > happen. Massive frame buffer corruption on domU before it locks up
> > solid. It seems the PCI memory stomp is still happening.
> If you boot Xen with guest_loglvl=all
>
> and then run the guest the consoel (xl dmesg) should also have
> the output from QEMU - that will help in seeing how it constructs
> the E820 (which was the problem last time).
I will gather this tonight - apologies, I forgot that I removed
the loglvl=all options from my boot config.

> Are you also able to get the serial log from the guest? (IF this is
> Linux?) I usually have this in my guest config:
>
> serial='pty'
>
> and when Linux boots up I add 'console=ttyS0,115200 loglevel=8 debug'
> which will output everything to the 'xl console <guest> | tee 
> /tmp/log'.
The intended guest is XP64. I will, however, get a Linux guest up
and running with the exact same domU config (apart from the disk
volume) for debugging this.

Gordan

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