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Re: [PATCH v2] hw/arm/virt: Expose empty NUMA nodes through ACPI

From: David Hildenbrand
Subject: Re: [PATCH v2] hw/arm/virt: Expose empty NUMA nodes through ACPI
Date: Tue, 16 Nov 2021 12:11:29 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

>> Examples include exposing HBM or PMEM to the VM. Just like on real HW,
>> this memory is exposed via cpu-less, special nodes. In contrast to real
>> HW, the memory is hotplugged later (I don't think HW supports hotplug
>> like that yet, but it might just be a matter of time).
> I suppose some of that maybe covered by GENERIC_AFFINITY entries in SRAT
> some by MEMORY entries. Or nodes created dynamically like with normal
> hotplug memory.

I'm certainly no SRAT expert, but seems like under VMWare something
similar can happen:


"VM was powered on with 4 vCPUs (4 NUMA nodes) and 4GB memory.
ACPI SRAT reports 128 possible CPUs and 128 possible NUMA nodes."

Note that that discussion is about hotplugging CPUs to memory-less,
hotplugged nodes.

But there seems to be some way to expose possible NUMA nodes. Maybe


David / dhildenb

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