Re: [PATCH 0/2] RFC: add -mem-shared option

[Dr. David Alan Gilbert]

* Marc-André Lureau (address@hidden) wrote:
> Hi,
> 
> Setting up shared memory for vhost-user is a bit complicated from
> command line, as it requires NUMA setup such as: m 4G -object
> memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -numa
> node,memdev=mem.
> 
> Instead, I suggest to add a -mem-shared option for non-numa setups,
> that will make the -mem-path or anonymouse memory shareable.
> 
> Comments welcome,

It's worth checking with Igor (cc'd) - he said he was going to work on
something similar.

One other thing this fixes is that it lets you potentially do vhost-user
on s390, since it currently has no NUMA.

Dave

> Marc-André Lureau (2):
>   memfd: add qemu_memfd_open()
>   Add -mem-shared option
> 
>  exec.c                  | 11 ++++++++++-
>  hw/core/numa.c          | 16 +++++++++++++++-
>  include/qemu/memfd.h    |  3 +++
>  include/sysemu/sysemu.h |  1 +
>  qemu-options.hx         | 10 ++++++++++
>  util/memfd.c            | 39 +++++++++++++++++++++++++--------------
>  vl.c                    |  4 ++++
>  7 files changed, 68 insertions(+), 16 deletions(-)
> 
> -- 
> 2.24.0
> 
> 
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK