Re: [Xen-devel] failed to unplug qemu devices

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: 16 March 2013 23:38
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] failed to unplug qemu devices
> 
> I just had a DomU start up where for some reason the qemu devices failed to
> be unplugged. Fortunately Windows saw this as two paths to the same disk
> instead of two separate disks so nothing got scrambled, but the network was
> dropping out all the time etc.
> 
> 
> Are there any circumstances under which the qemu unplug could fail to
> work? And if so, how could I tell?
> 

Which QEMU are you using? The most common case for unplug failure I encounter 
with traditional is a driver blacklisting issue and the protocol tells you via 
the magic number from port 0x10. If this is good then the unplug should be ok. 
I don't know whether anyone has ported the blacklisting handshake to upstream 
QEMU though; I don't have code to hand.

  Paul

> More likely some race condition in GPLPV but I first want to discount the
> possibility that qemu might fail to unplug.
> 
> Thanks
> 
> James
> 
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