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

[Julien Grall <julien.grall@xxxxxxx>]

Hello,

Please avoid top-posting.

On 30/05/2016 02:58, Big Strong wrote:
> I'm not sure if you mean  xen\include\asm-x86\hypercall.h
> or extras\mini-os\include\x86\x86_32\hypercall-x86_32.h, I guess it is
> the former one.
I am not sure why you are looking at the Xen repository... From the 
beginning of the thread we spoke about Linux...
> Can I use these functions directly in domU kernel?  When using
> libxc/privcmd in domU userland, the arguments are converted into a
> suitable form using HYPERCALL_BUFFER_AS_ARG(arg), how should the
> arguments be conveyed when using from domU kernel?
As said earlier, please look at the example in the Linux kernel. There 
is plenty of them.
The userspace is using specific buffer because we need to prevent Linux 
to swap the page. Kernel memory is not swapped.
Regards,

--
Julien Grall

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