Re: [libvirt] [PATCH v2 00/45] Enhance guest CPU configuration code

Version 2: - review comments addressed; see individual patches for details This patch series does several things: - fixes tests to avoid relying on bugs in our code - adds support for advertising supported CPU modes and models in domain capabilities - starts adding better and higher level APIs to our cpu driver (the old low level APIs will be removed once this process is over) - prepares qemu driver for asking QEMU what a host CPU looks like and what CPU models can be run on it - makes QEMU CPU command line builder build command line and nothing else The added part of domain capabilities XML looks like this: <cpu> <mode name='host-passthrough' supported='yes'/> <mode name='host-model' supported='yes'> <model fallback='allow'>Broadwell</model> <vendor>Intel</vendor> <feature policy='disable' name='aes'/> <feature policy='require' name='vmx'/> </mode> <mode name='custom' supported='yes'> <model usable='no'>Broadwell</model> <model usable='yes'>Broadwell-noTSX</model> ... </mode> </cpu> and host-passthrough is only advertised as supported for KVM domains, host-model is only supported when guest architecture is compatible with host and overall it should just work the way one would expect (in contrast to the current state of the code).