Re: [Xen-devel] How does hypervisor handle the hypercalls fromguest OSes?

["K.C. Chiu" <B8844014@xxxxxxxxxxxxxxxxx>]

Thanks for your help !!

I would try to handle my new hypercall !

But I have another question, how do I debug in the Xen hypervisor side?

Just "printk" ?

However I could not find out any print message in /var/log/message and the
xen_read_console ?

Cheers

-- C.K. Chiu , Taiwan

----- Original Message ----- 
From: "Rolf Neugebauer" <rolf.neugebauer@xxxxxxxxx>
To: "K.C. Chiu" <B8844014@xxxxxxxxxxxxxxxxx>
Cc: <rolf.neugebauer@xxxxxxxxx>; <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
Sent: Monday, May 10, 2004 10:22 PM
Subject: Re: [Xen-devel] How does hypervisor handle the hypercalls fromguest
OSes?


> for a new hypercall here are the files you need to change:
>
> 1. define a hypercall number + params in
> xen/include/hypervisor-ifs/hypervisor-if.h or similar
>
> 2. add an entry corresponding to the hypercall number in the
> hypervisor_call_table in xen/arch/i386/entry.S
>
> 3. implement the hypercall in xen (function as in entry.S)
>
> 4. provide an assempbly stub in XenoLinux for your hypercall like in:
> xenolinux-2.4.26-sparse/include/asm-xen/hypervisor.h
>
> then you can use the function name you use in hypervisor.h in XenoLinux.
>
> alternatively you piggy-back your hypercall onto an existing one, if it
> matches the function of that hypercall. quite a few hypercalls already
> multiplex multiple related functions onto on hypercall.
>
> Rolf
>
> On Mon, 2004-05-10 at 14:55, K.C. Chiu wrote:
> > Hi All !!
> >
> > I'm trying to encapsulate some operations into "hypercall" and pass
> > the hypercall into hypervisor.
> >
> > But I cannot find out how the hypervisor to deal with hypercalls
> > from guest OSes.
> >
> > I find a function "do_dom0_op" in xeno-1.2.bk/xen/common/dom0_ops.c.
> >
> > It looks like the function which would deal with hypercalls .
> >
> > and I try to modify the code in do_dom0_op to handle my new hypercall,
> > but I failed.
> >
> > can someone tell me how does hypervisor handle the hypercalls from
> > guest OSes?
> >
> > Cheers
> >
> > -- C.K. Chiu ,
> > Taiwan
>
>
>
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