[Xen-API] enabling plain HVM migration in xapi

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hi,

Xapi currently insists that VMs have PV drivers installed before allowing 
migration. The rationale for this is: (i) you get the best performance with 
drivers installed, so you should always install them; and (ii) we focus our 
testing on this case :-)

However, sometimes it is convenient to bypass this particular check and just do 
it anyway. I've written a wiki page containing a simple bash script which 
writes keys to xenstore, fooling xapi into believing that PV tools are 
functioning. Let me know if you find it useful!

http://wiki.xensource.com/xenwiki/XAPI_fake_presence_of_pv_drivers

In the future we probably should add some better mechanism to xapi to 
selectively bypass this check; either something global ("enable experimental 
feature:x") or something per-VM (e.g. an "other-config" key). Any thoughts? My 
own thinking was that if migrate should always work (if a little slowly) then a 
global option is better; but if it's guest dependent (i.e. crashes guest type 
X, works ok on Y) then a per-VM flag is better.

Cheers,
Dave

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