Re: [Xen-devel] xen-4.3 port

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-01-28 at 14:34 -0500, Konrad Rzeszutek Wilk wrote:
> > do i need implement it first ?
> 
> No. But you should have stub functions in your hypercall page to at least
> return -ENOSYS for everything you don't implement.
> 
> How do you construct your hyperpage?

Note that nobody should be constructing a hypercall page themselves,
they should rely on the hypervisor to do it (for PVH guests they will
need to request it, but for a PV guest it is just there).

If a guest calls the hypercall page entry associated with an
unimplemented hypercall then the effect will be an -ENOSYS return.

Ian.


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