Xen devel - Jun 2007 - Hypercall from Hvm Guest

Can i make hypercalls from a HVM Guest?
I want to write a module in Linux and make hvm calls from that module.
Is it possible?

Thanks




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Of course you can.

You can take the codes in unmodified_drivers/ as examples.

 

-- Dexuan

 

________________________________

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Koripella Srinivas
Sent: 2007年6月22日 18:41
To: xen-devel@lists.xensource.com
Subject: [Xen-devel] Hypercall from Hvm Guest

 

Can i make hypercalls from a HVM Guest?
I want to write a module in Linux and make hvm calls from that module.
Is it possible?






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> -----Original Message-----
> From: xen-devel-bounces@lists.xensource.com 
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of 
> Koripella Srinivas
> Sent: 22 June 2007 11:41
> To: xen-devel@lists.xensource.com
> Subject: [Xen-devel] Hypercall from Hvm Guest
> 
> Can i make hypercalls from a HVM Guest?
Yes. 
> I want to write a module in Linux and make hvm calls from that module.
Not sure what "HVM calls" are, but I guess you mean hypercalls. 
> Is it possible?
If my above guess on what you mean is correct, then yes. 

Note however that only SOME of the hypercalls are actually available to
HVM guests (mostly because they don''t make sense, but some may simply
be
that they weren''t needed to implement the Network and block device
drivers that are available to HVM guests). See
.../xen/arch/x86/hvm/hvm.c for a list of the hypercalls implemented
(listed in hvm_hypercall{32,64}_table). 

You may want to have a look in the "unmodified_driver" directory in
the
root of the xen source-tree. 

--
Mats
> 
> Thanks
> 
> 
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