Re: [Xen-users] use hypercall in kernel module

[Julien Grall <julien.grall@xxxxxxx>]

On 25/05/16 12:14, Big Strong wrote:
>         Give a look to arch/x86/asm/xen/hypercall.h to see how
>         hypercalls are implemented for the kernel.
>
>
>     Regards,
>
>     --
>     Julien Grall
>
>
> Thanks for the suggestion. But what I pasted is right from hypercall.h.
> What I'm not understand is how can I directly assign arguments to the
> registers a1-a5. As I don't want to use privcmd to issue the hypercall,
> which is a user-level interface. Can you show me one simple example on
> how to do that?
There is multiple example on how to implement hypercalls for the kernel 
within this file (e.g HYPERVISOR_mmu_update).
You may have to implement yours if there is no helpers for you hypercall.

Regards,

--
Julien Grall

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