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Date:      Fri, 9 Dec 2016 09:32:17 -0700
From:      Nathan Friess <nathan.friess@gmail.com>
To:        =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com>
Cc:        freebsd-xen@freebsd.org
Subject:   Re: 11-RELEASE acting as vbd backend
Message-ID:  <584ADC91.8050909@gmail.com>
In-Reply-To: <20161209144630.dfga5mozh72veo4g@dhcp-3-221.uk.xensource.com>
References:  <247e5b6c-2713-27cf-f8fa-61e55c9e2025@gmail.com> <20161206100414.pi7ep2zbkduhuol7@dhcp-3-221.uk.xensource.com> <39e43ae4-6388-c698-c3c2-43cbc1f7b93c@gmail.com> <20161209144630.dfga5mozh72veo4g@dhcp-3-221.uk.xensource.com>

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On 16-12-09 07:46 AM, Roger Pau Monné wrote:
> Hello,
>
> Sorry for the delay, there was a huge can of worms behind this. I have a
> solution, but it requires patching both Xen and the FreeBSD kernel. Please bear
> with me, I will send those patches once ready.

It sounds like you might know this already, but I did some more digging 
and here is what I can see so far...

The important command is "xl devd".  Running that under truss, it is 
trying to open /dev/xen/xenbus and that was the cause of the No such 
file error.  It looks like the 10.3 tools used to open /dev/xen/xenstore 
instead.

I can get around this by exporting XENSTORED_PATH="/dev/xen/xenstore".

Now xl devd is stuck at:

libxl: error: libxl_event.c:639:libxl__ev_xswatch_register: create watch 
for path /local/domain/7/backend: Invalid argument

So it seems like an API issue with asking the kernel or dom0 to set a 
watch for new backend devices.

Whenever the patches are ready I can test them on my system.

Nathan




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