Re: [Qemu-devel] [libvirt] [PATCH 0/7] x86: Rework KVM-defaults compat code, enable kvm_pv_unhalt by default

[Paolo Bonzini]

On 14/10/2017 01:56, Eduardo Habkost wrote:
> Now, I don't know yet what's the best default for a guest that
> has CONFIG_PARAVIRT_SPINLOCK when it sees a host that supports
> kvm_pv_unhalt.  But I'm arguing that it's the guest
> responsibility to choose what to do when it detects such a host,
> instead of expecting the host to hide features from the guest.
> The guest and the guest administrator have more information to
> choose what's best.
> 
> In other words, if exposing kvm_pv_unhalt on CPUID really makes
> some guests behave poorly, can we fix the guests instead?

Waiman just did it. :)

https://marc.info/?l=linux-kernel&m=150972337909996

Paolo