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

[Paolo Bonzini]

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