On 23/04/2020 09:38, 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 <jbeul...@suse.com> > --- > v2: Use HANDLE_64() instead of HANDLE_PARAM() for function parameter. > --- > Is there really no way to avoid the buffer copying in libxc?
Not currently no. Since we now have access to regular kernel memory via mmap() on /dev/xen/hypercall, we are now in a position where someone could hook up implement a small memory allocator backed exclusively by mmap()'d pages, and this would remove all bounce buffering in userspace. ~Andrew
