On Fri, Mar 16, 2018 at 05:44:28PM +0000, Daniel P. Berrangé wrote:
Since Xen lets you specify raw "cpuid" register values here, surely this is flexible enough to allow us to support the mode=custom CPU models ?
We would just need to make sure every bit poisition used either 0 or 1, and not 'x', so that we are fully overriding whatever defaults are presented by the hypervisor "host" CPU model. Or is life more complicated than that ?
This is what v1 of this series had... See discussion there, especially message from Jiri: https://www.redhat.com/archives/libvir-list/2017-June/msg01304.html And this, from... you: https://www.redhat.com/archives/libvir-list/2017-June/msg01308.html This is not only about 'x'. But also about setting '1' where hardware does not really support given feature. This will also result in "broken" CPU. -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?