From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Bug: Limitation of <=2GB RAM in domU persists with
 4.3.0
Date: Wed, 24 Jul 2013 12:06:39 -0400
Message-ID: <20130724160639.GB5804@phenom.dumpdata.com>
References: <51EF04D8.1090600@bobich.net>
	<20130724140813.GH2518@phenom.dumpdata.com>
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To: Gordan Bobic <gordan@bobich.net>
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On Wed, Jul 24, 2013 at 03:17:50PM +0100, Gordan Bobic wrote:
> On Wed, 24 Jul 2013 10:08:13 -0400, Konrad Rzeszutek Wilk
> <konrad.wilk@oracle.com> 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.

Take your time.
> 
> >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

Ah, I am not actually sure how Linux will work. I hadn't had a chance
to test that recently :-(

> and running with the exact same domU config (apart from the disk
> volume) for debugging this.
> 
> Gordan