Re: [Xen-users] Converting a HVM Guest into a PV-on-HVM Guest

[Todd Deshane <todd.deshane@xxxxxxx>]

On Mon, Jun 20, 2011 at 10:23 PM, Srujan Kotikela <ksrujandas@xxxxxxxxx> wrote:
>> Hi Todd,
>> Thanks for the reply.
>> I am trying to invoke a hypercall from the HVM guest. The only way I did
>> hypercalls from DomU till now (on PV guests) is use the libxc
>> library do_xen_hypercall (which in turn uses do_privcmd which in turn uses
>> ioctl).
>> Now I have a added a custom hypercall to xen and I am trying to invoke it
>> from HVM guest. As the HVM guest is not xenified (-linux) it doesn't have
>> the privcmd interface (/proc/xen/privcmd). So I am looking for a way to
>> invoke the custom hypercall from HVM. While in this try, I found that
>> pv-on-hvm will enable hypercalls from HVM guest. However I also read that it
>> may not allow all the hypercalls (correct me if I am wrong).
>> While looking at the other posts I found
>> this, http://xen.1045712.n5.nabble.com/hypercalls-from-HVM-guest-on-XEN-3-4-3-td4454566.html which
>> recommends to look into tools/firmware/hvmloader. There is some code in
>> hypercall.h in the hvmloader directory
>> (http://rswiki.csie.org/lxr/http/source/tools/firmware/hvmloader/hypercall.h?v=xen-4.0.0;a=ppc).
>> I am figuring out how to make use of this. Will update once I figure it out.
>> Sorry for not being unclear, earlier.

I do think that you are getting into the territory where you might
want to read this [1] and then ask on xen-devel for clarification.

[1] http://wiki.xensource.com/xenwiki/AskingXenDevelQuestions

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