Re: [PATCH v2 3/6] x86/mem-paging: use guest handle for XENMEM_paging_op_prep

[Wei Liu <wl@xxxxxxx>]

On Thu, Apr 23, 2020 at 10:38:18AM +0200, Jan Beulich wrote:
> While it should have been this way from the beginning, not doing so will
> become an actual problem with PVH Dom0. The interface change is binary
> compatible, but requires tools side producers to be re-built.
> 
> Drop the bogus/unnecessary page alignment restriction on the input
> buffer at the same time.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Wei Liu <wl@xxxxxxx>

> ---
> v2: Use HANDLE_64() instead of HANDLE_PARAM() for function parameter.
> ---
> Is there really no way to avoid the buffer copying in libxc?

The buffer is managed by the caller. There is no good way for libxc to
know its properties as far as I can tell.

Wei.