[pve-devel] [PATCH-SERIES v3 qemu-server/manager/common] add and set x86-64-v2 as default model for new vms and detect best cpumodel
DERUMIER, Alexandre
alexandre.derumier at groupe-cyllene.com
Thu Jun 1 15:53:58 CEST 2023
> >
> > What AMD CPUs did you try it on?
> >
> epyc v2/v3 with last microcodes
>
>
> does it work with x86-64-v3 ? (because the other patch of the series
> could autofind the best new model if it's working)
Looking at linux kernel code, they have some quirks based on cpu model
number && vendor
nehalem is .family = 6, .model = 26,
kvm64 is .family = 15, .model = 6
qemu64 is.family = 15, .model = 107,
maybe it could be interesting to test with adding flags from
qemu64/kvm4 to see if it's the same behaviour ?
from kvm64, xf86-64-v2 is
'+lahf_lm,+popcnt, +sse4.1,sse4.2, +ssse3' (and optionnal +aes)
(and we already enable lahf_lm by default in QemuServer/CPUConfig.pm )
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