On 07/01/20 14:55, Christophe de Dinechin wrote: > So what about ranking the accelerators, so that all combinaisons > -accel=kvm:tcg, -accel=tcg:kvm, -accel kvm -accel tcg, etc would
(I assume you mean "-machine accel=kvm:tcg" and "-machine accel=tcg:kvm" for the first two. This is the "older" way which has now become sugar for "-accel kvm -accel tcg"). > all pickup kvm if available, and tcg as a fallback? Implementation-wise, > it would simply mean ranking the accelerators and updating the accelerator > only if it’s available and better. This is an interesting idea. I like this better than "-accel best", because "-accel best" has the problem that you can't add suboptions to it (the suboptions for the various accelerators are disjoint). It would break backwards compatibility for "-machine accel=tcg:kvm", which so far meant "use TCG if compiled in, otherwise use KVM". This is not something I would have a problem with... except that "tcg:kvm" is the default if no -accel option is provided! Paolo
