On Wed, Jun 21, 2017 at 04:02:18PM +0200, Marc-André Lureau wrote: > Add a new memory backend, similar to hostmem-file, except that it > doesn't need to create files. It also enforces memory sealing. > > This backend is mainly useful for sharing the memory with other > processes.
How exactly can the memfd be used to share memory? Is there an existing mechanism for sharing the memfd file descriptor with another process? > > Note that Linux supports transparent huge-pages of shmem/memfd memory > since 4.8. It is relatively easier to set up THP than a dedicate > hugepage mount point by using "madvise" in > /sys/kernel/mm/transparent_hugepage/shmem_enabled. > > Usage: > -object memory-backend-memfd,id=mem1,size=1G > > Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com> > --- > backends/hostmem-memfd.c | 67 > ++++++++++++++++++++++++++++++++++++++++++++++++ > backends/Makefile.objs | 2 ++ > qemu-options.hx | 11 ++++++++ > 3 files changed, 80 insertions(+) > create mode 100644 backends/hostmem-memfd.c > [...] -- Eduardo
