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Re: [Xen-devel] I cannot get any message from domU by console / pv_ops d

To: Michael D Labriola <mlabriol@xxxxxxxx>
Subject: Re: [Xen-devel] I cannot get any message from domU by console / pv_ops domU kernel crashes with xen_create_contiguous_region failed
From: Michael D Labriola <mlabriol@xxxxxxxx>
Date: Wed, 23 Dec 2009 15:15:55 -0500
Cc: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, ?????? <peb1611@xxxxxxxxx>, Ian.Campbell@xxxxxxxxxx, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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> Turning PREEMPT off entirely made all the "scheduling while atomic" 
> messages on dom0 go away.

The "scheduling while atomic" messages also go away with PREEMPT_VOLUNTARY 
instead of PREEMPT.

> With our witout PREEMPT, I can successfully pass PCI devices to an old 
> 2.6.18-xen domU as long as the devices are page-aligned.  I only can't 
> pass PCI devices into pv_ops domUs.  Is the PCI frontend code even in 
> xen/master?

Yikes.  Jeremy merged pcifront after I pulled last...  :-(  My bad.

I can now pass page-aligned PCI devices into a pv_ops domU from my dom0. 
If domU has PREEMPT, it gets tons of "scheduling while atomic" messages 

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