Re: Re: [virtio-comment] [PATCH v2 01/11] transport-fabrics: introduce Virtio Over Fabrics overview

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, May 04, 2023 at 05:46:46PM +0800, zhenwei pi wrote:
> 
> 
> On 5/4/23 16:57, David Hildenbrand wrote:
> > On 04.05.23 10:19, zhenwei pi wrote:
> > > In the past years, virtio supports lots of device specifications by
> > > PCI/MMIO/CCW. These devices work fine in the virtualization environment.
> > > 
> > > Introduce Virtio Over Fabrics transport to support "network defined
> > > peripheral devices". With this transport, Many Virtio based devices
> > > transparently work over fabrics. Note that the balloon device may not
> > > make sense. Shared memory regions won't work.
> > 
> > Anything that involves memory (memory balloon, memory device, shared
> > memory) is fully incompatible I would guess.
> > 
> 
> Hi,
> 
> Agree that memory device and shared memory is incompatible.
> 
> But memory balloon device, I don't know if it's possible to use in future.
> As far as I can imagine: a user process runs virtio-of target by listening
> localhost, and memory balloon isolates same pages from kernel, the user
> process maps these physical pages into virtual memory ...

I don't see anything big that is wrong with balloon. device inflates
balloon, this memory is stolen from guest. isn't this what user
wanted? presumably there's a way for device to send this
information to the hypervisor otherwise it seems kind of
pointless.

-- 
MST


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