Re: Conflicting parameters on qemu call

On Thu, Aug 20, 2020 at 08:11:30PM +0200, Jan Walzer wrote: > Hi Lists, > > I currently have the issue of wanting to use emu-system-x86_64 on a ppc64le platform. > > It is imperative to pass the "-accel tcg,thread=multi” parameter to qemu > when starting an instance, as without that, it will only use one thread > and hence of limited/no use. > > The problem is, that libvirt itself, passes “-machine q35,accel=tcg” to > qemu, which is a different parameter, that conflicts with the other one. > > Can we discuss, if I either have overlooked something, or is there a workaround, or is this a bug? What you're trying todo is intentionally not available. The memory ordering constraints needed for running x86_64 guests on ppc64 hosts cannot be satisfied, so multi-threaded TCG is not available. For any guest/host combination where multi-thread TCG is safe to use, QEMU will enable it automatically, so nothing is required in libvirt.