Cascadelake-Server, Cascadelake-Server-noTSX Intel Xeon Processor (Cascade Lake, 2019), with вЂњsteppingвЂќ levels 6 Mixture of host CPU models between machines, if live migrationД¬ompatibility is required, use the newest CPU model that is compatibleДЄcross all desired hosts. Matches the generation of the host CPUs in use. The following CPU models are preferred for use on Intel hosts.ДЄdministrators / applications are recommended to use the CPU model that Preferred CPU models for Intel x86 hosts В¶ In addition to what is listed, there are also many CPU modelДЄliases which resolve to a different CPU model version,Дepending on the machine type is in use. Lists the long term stable CPU model versions (eg Haswell-v4). Table that follows illustrates which ABI compatibility levelsД¬an be satisfied by the QEMU CPU models. It is expected that inДЇuture OS and toolchains are likely to target newer ABIs. Traditionally most operating systems and toolchains would

The x86_64 architecture has a number of ABI compatibility levelsДefined. Guarantee the CPU family, stepping, etc will precisely match the hostД¬PU, as they would with вЂњHost passthroughвЂќ, but gives much of theД«enefit of passthrough, while making live migration safe.ДЄBI compatibility levels for CPU models В¶ To approximate the host model as closely as possible. This uses the QEMU вЂњNamed modelвЂќ feature, automatically pickingДЄ CPU model that is similar the host CPU, and then adding extra features Libvirt supports a third way to configure CPU models known as вЂњHost In both cases, it is possible to optionally add or remove individual CPUДЇeatures, to alter what is presented to the guest by default. Migrating between hosts with differing hardware. Isolation from the host CPU, allowing greater flexibility in live These allow the guest VMs to have a degree of Typically refer to specific generations of hardware released by QEMU comes with a number of predefined named CPU models, that

Recommended CPU to use, provided live migration is not required. Stable CPU is exposed to the guest across hosts. Unsafe when this mode is used as libvirt / QEMU cannot guarantee a If they cannot be supported with virtualization. Note that KVM may filter out some host CPU model features This passes the host CPU model features, model, stepping, exactly to Two ways to configure CPU models with QEMU / KVM В¶

Qemu-kvm