[Xen-devel] Communication between HVM and dom0 through the Hypervisor

[Daniele Sgandurra <dansgan@xxxxxxxx>]

Is there currently a method for passing information
between a HVM domain and domain 0 directly through the
hypervisor?
I understand there could be at least three ways to do
so:

-VMCALL from HVM + params in registers.
-using "PV-on-HVM", but I think the frontend drivers
need to be ported in the mainline Linux kernel and
this is currently being done, right?
-using XenStore/XenBus (is that possible?)

As an example, suppose I have a HVM running Linux (on
Intel IVT-x), and I want to call a callback function
in dom0 each time the HVM contacts the hypervisor,
what would you suggest me to do? Imagine I want to
notify dom0 each time a process issues a system call,
by adding some code in the prologue of the syscall
handler to notify the hypervisor.

Thank you very much :-)


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