[Xen-devel] Detecting PV drivers

[Jon Ludlam <jonathan.ludlam@xxxxxxxxxxxxx>]

Hi,

I'm trying find out the best way of detecting whether PV drivers have 
loaded in an HVM guest. For example, this is so we can decide whether or 
not to wait for a response from the guest when suspending.
I think the best way of doing this is to find out whether the hypercall 
page has been populated or not, as this is the first thing that any PV 
drivers will have to do, but I don't know how to detect this, or even if 
this is possible - is there any way of finding this out?
At the moment we're currently thinking of looking at status of the 
callback IRQ, which is the second thing that the Citrix PV drivers 
currently do, but I'm not sure about any other drivers. Would this be a 
reasonable thing to do if we can't detect the hypercall page?
Cheers,

Jon


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