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

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 13 Dec 2019 11:39:57 +0000
Stefan Hajnoczi <stefanha@redhat.com> wrote:

> On Fri, Nov 29, 2019 at 10:23:25AM +0100, Igor Mammedov wrote:
> > On Thu, 28 Nov 2019 16:59:33 +0000
> > "Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:
> >   
> > > * Marc-André Lureau (marcandre.lureau@redhat.com) 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.  
> > Switching to memdev will let vhost-user on s390 work as well.
> > This is convenience option and workarounds inability to set main RAM
> > properties in current impl.   
> 
> Gong Su asked about virtio-fs (vhost-user) on s390.  This patch series
> might be the first step to enabling it.

I'm preparing(resplitting/cleaning up) series that will switch main RAM
to memdev backend.

(
I'd prefer to post complete series that does conversion across all boards.
But if it's pressing, I surely can post several patches to enable it for s390
and get some early feedback on approach
)


> 
> Stefan