qemu64-v2?

[Christian Theune]

Hi,

colleagues noticed that they are increasingly encountering software that 
requires x86-64-v2 (typically complained by a container’s glibc) and they need 
to select specific architectures in our VMs.

We’re currently in the process of migrating away from Intel to AMD (about few 
Intel hosts left in the pool) and we could target specific AMD architectures in 
the future, but would obviously then loose the ability to potentially mix in 
Intel in the future again. 

We’ve been quite happy running mostly generic architectures except for a few 
specific workloads that benefit from faster TLS with hardware support. 

Reading up on the issue it looks like the microarchitecture levels defined in 
2020 would have exactly the intention to make managing mixed fleets easier - 
and I guess RedHat would have an interest to extend Qemu/KVM to match this?

https://en.wikipedia.org/wiki/X86-64#Microarchitecture_levels

I wasn’t able to find anything on the Internet regarding Qemu development. 
Proxmox seems to have simply defined manual presets:
https://pve.proxmox.com/wiki/Qemu/KVM_Virtual_Machines

I guess I could also provide those settings as defaults, but I’m wondering 
whether this would be better placed for long term support in Qemu directly?

Kind regards,
Christian

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