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

[Stefan Hajnoczi]

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" <address@hidden> wrote:
> 
> > * 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.
> 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.

Stefan

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