Re: [Qemu-devel] [PATCH RESEND v2] i386/kvm: add support for KVM_CAP_X86_DISABLE_EXITS

[Michael S. Tsirkin]

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