On Wed, May 16, 2018 at 05:04:41PM +0200, Paolo Bonzini wrote: > On 16/05/2018 16:22, Michael S. Tsirkin wrote: > >> kvm-hint-dedicated=on only sets the CPUID bit, which Linux for example > >> uses that to disable pv spinlocks. "-realtime dedicated-cpus=on" only > >> disables the vmexits. You can use the two independently. > > > > But when would you want to use the two independently? > > 1) For testing > > 2) When some of your QEMUs are too old to support kvm-hint-dedicated=on, > you may still want to use -realtime dedicated-cpus=on to get better > performance on the new one. > > Paolo
For the second purpose, can't we handle this using machine types? -- MST
