Re: [Xen-devel] Accessing the hypervisor from VMs

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

On Wednesday 09 March 2005 21:17, Diwaker Gupta wrote:
> > You could add one or more hypercalls to do this.  Alternatively, you can
> > put the information you want to pass up into a shared memory page so that
> > dom0 can read it directly.
> >
> > > Is it possible to access the hypervisor through a VM other than dom0?
>
> Sure, I can do all this from dom0, but I want to be able to do it from
> guests other than dom0 -- how does that work?

You could add a new type of hypercall that is available to any dom and returns 
the data you require.  For starters, take a look at the hypercall table in 
xen/arch/x86/x86_32/entry.S

All you need to do to make it work with unpriv domains is to not check the 
domains privileges ;-)

Setting up Xen <-> domU shared memory would be a bit more involved.

Cheers,
Mark


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