Cascadelake-Server, Cascadelake-Server-noTSX Intel Xeon Processor (Cascade Lake, 2019), with “stepping” levels 6 Mixture of host CPU models between machines, if live migrationĬompatibility is required, use the newest CPU model that is compatibleĪcross all desired hosts. Matches the generation of the host CPUs in use. The following CPU models are preferred for use on Intel hosts.Īdministrators / applications are recommended to use the CPU model that Preferred CPU models for Intel x86 hosts ¶ In addition to what is listed, there are also many CPU modelĪliases which resolve to a different CPU model version,ĭepending 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 levelsĬan be satisfied by the QEMU CPU models. It is expected that inįuture 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 levelsĭefined. Guarantee the CPU family, stepping, etc will precisely match the hostĬPU, as they would with “Host passthrough”, but gives much of theīenefit of passthrough, while making live migration safe.ĪBI compatibility levels for CPU models ¶ To approximate the host model as closely as possible. This uses the QEMU “Named model” feature, automatically pickingĪ CPU model that is similar the host CPU, and then adding extra features Libvirt supports a third way to configure CPU models known as “Host In both cases, it is possible to optionally add or remove individual CPUįeatures, 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 ¶ System Emulation Guest Hardware Specifications.System Emulation Management and Interoperability.Managing device boot order with bootindex properties.Keys in the character backend multiplexer.
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