[PATCH 19/19] Documentation: ACPI for ARM64

[Christoffer Dall]

On 29 July 2014 14:52, Arnd Bergmann <arnd at arndb.de> wrote:
> On Tuesday 29 July 2014 14:37:38 Christoffer Dall wrote:
>>
>> For reference, Red Hat's current arguing point for ACPI in VMs is
>> hotplug of things like CPUs and memory for very large VMs, but I
>> haven't thought too carefully about this just yet, as I don't have a
>> 100+ core ARM 64-bit hardware lying around...
>
> I thought you could run guests with more virtual CPUs that you have
> physical CPUs on the host.
>

you can, my sentence was meant to be a bit tongue-in-cheek, running
100 VCPUs on the Foundation Model (which is the only thing I have on
my desk as of now) is not very useful, so I just don't care at this
point.  Let me see or give me access to something with at least 8
physical cores before I start caring (with my community hat on, as a
Linaro employee I may be told to care).

> Regarding CPU and memory hotplug, don't we already have PSCI and
> xen-balloon/virtio-balloon for that?
>
Virtio-balloon don't do anything for you wrt. CPUs, wrt. memory you
have to provision it beforehand.

-Christoffer