Re: [Xen-devel] PRIVCMD in HVM DomU

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 20 Jun 2011, Srujan Kotikela wrote:
> Hi,
> 
> I am trying to make a hypercall from a HVM guest. I tried by copying all the 
> xen-libs from Dom0 to DomU. I am getting an
> error PRIV_CMD not found (obviously). I have searched online and found 
> installing PV on HVM drivers is a way to go about
> it. However, this won't guarantee that I can make all the hypercalls (correct 
> me if I am wrong).
> 
> I am trying to invoke a custom hypercall (done by modifying xen_source in 
> dom0). So, is it not possible to have just the
> priv cmd interface in the DomU and invoke a hypercall with xen libraries 
> copied from Dom0 (these libs have my custom
> hypercall included)?

What kernel version are you using?
If you make sure CONFIG_XEN_PVHVM is enabled in your kernel config, you
should have all the mechanisms in place in the kernel to issue
hypercalls.
At that point if you also make sure CONFIG_XENFS is enabled, you should
also be able to issue hypercalls from userland.

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