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Subject: Re: [virtio-dev] [PATCH v2 1/1] virtio-ism: introduce new device virtio-ism
On Thu, 12 Jan 2023 01:56:14 -0500, "Michael S. Tsirkin" <mst@redhat.com> wrote: > On Thu, Jan 12, 2023 at 10:01:25AM +0800, Jason Wang wrote: > > On Wed, Jan 11, 2023 at 11:11 PM Halil Pasic <pasic@linux.ibm.com> wrote: > > > > > > On Wed, 11 Jan 2023 19:08:53 +0800 > > > Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > > > > > > > > +ISM(Internal Shared Memory) device provides the ability to share memory between > > > > > > +different VMs launched from the same entity. > > > > > > > > > > Launched by instead of from? Maybe introduce a catchy name for the > > > > > "entity that launched the VMs" and prevent oversimplification by > > > > > explaining any shortcomings of the name if any in one place. Host would > > > > > be one candidate, VMM another. > > > > > > > > Cornelia Huck wrote: > > > > > > > > Is there a way to avoid the term "host" (throughout this document)? > > > > IIUC, you need the uniqueness within the scope of the entity that > > > > launches the different instances that get shared access to the regions > > > > (which could conceivably a unit of hardware?) > > > > > > > > And I think she is right, so I am trying to remove the term HOST. > > > > > > > > Do you have better opinions? I think VMM is not particularly suitable. > > I think fundamentally from spec POV memory is shared between devices. > How sharing is accomplished guest does not care so neither should the > spec. Can some RDMA tricks be used for synchronisation behind the > scenes? Maybe, the spec does not care. But we can give an example. > > So something like: > > An ISM(Internal Shared Memory) device provides the ability to > access memory shared between multiple devices. This allows low-overhead > communication in presence of such memory. For example, memory can be > shared with guests of multiple virtual machines running on the same > host, with each virtual machine including an ISM device and with > the guests using the ISM devices to access the shared memory. > > what do others think? I think it's great. > > > -- > MST >
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