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Re: [Xen-devel] Paravirtualised drivers for fully virtualised domains

To: "Zhao, Yunfeng" <yunfeng.zhao@xxxxxxxxx>
Subject: Re: [Xen-devel] Paravirtualised drivers for fully virtualised domains
From: Steven Hand <Steven.Hand@xxxxxxxxxxxx>
Date: Wed, 02 Aug 2006 09:56:10 +0100
Cc: Steven.Hand@xxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, sos22@xxxxxxxxxxxxx, "He, Qing" <qing.he@xxxxxxxxx>
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>>I found some issues regarding this patch.
>>When I'm trying to start windows as VMX guest (with no drivers, of course) 
>>under this patch, the guests fail. I ran with three images, windows 2000, 
>>XP and 2003.
>>For 2000 and XP, QEMU windows do not show, there are two lines in the
>>      (XEN) Create event channels for vcpu 0.
>>      (XEN) Send on unbound Xen event channel?

As you note yourself, this problem is very unlikely to be anything to do
with the new PV drivers or associated infrastructure. 

I think your problem is more likely to be a race condition in the startup 
of the qemu-dm helper process. If you check the latest /var/log/qemu-*.log 
and see a message something like "xc_get_pfnlist returned -1" this means 
that qemu-dm tried to interrogate the domain before it had been created.

(I've seen this myself before but only on non-debug builds of Xen) 

We should fix this properly, but for now you can just retry. 



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