Re: [PATCH v4 0/8] Introduce the microvm machine type

[Paolo Bonzini]

On 25/09/19 10:10, Sergio Lopez wrote:
> That would be great. I'm also looking forward for virtio-mem (and an
> hypothetical virtio-cpu) to eventually gain hotplug capabilities in
> microvm.

I disagree with this.  virtio is not a silver bullet (and in fact
perhaps it's just me but I've never understood the advantages of
virtio-mem over anything else).

If you want to add hotplug to microvm, you can reuse the existing code
for CPU and memory hotplug controllers, and write drivers for them in
Linux's drivers/platform.  The drivers would basically do what the ACPI
AML tells the interpreter to do.

There is no reason to add the complexity of virtio to something as
low-level and deadlock-prone as CPU hotplug.

Paolo

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