Re: [PATCH RFC V5 0/6] kvm : Paravirt-spinlock support for KVM guests

[Marcelo Tosatti <mtosatti@redhat.com>]

On Thu, Mar 29, 2012 at 12:02:29AM +0530, Raghavendra K T wrote:
> On 03/23/2012 01:35 PM, Raghavendra K T wrote:
> >The 6-patch series to follow this email extends KVM-hypervisor and Linux guest
> >running on KVM-hypervisor to support pv-ticket spinlocks, based on Xen's
> >implementation.
> >
> >One hypercall is introduced in KVM hypervisor,that allows a vcpu to kick
> >another vcpu out of halt state.
> >The blocking of vcpu is done using halt() in (lock_spinning) slowpath.
> >one MSR is added to aid live migration.
> >
> >Changes in V5:
> >- rebased to 3.3-rc6
> >- added PV_UNHALT_MSR that would help in live migration (Avi)
> >- removed PV_LOCK_KICK vcpu request and pv_unhalt flag (re)added.
> 
> Sorry for pinging
> I know it is busy time. But I hope to get response on these patches
> in your free time, so that I can target next merge window for this.
> (whether it has reached some good state or it is heading in reverse
> direction!). it would really boost my morale.
> especially MSR stuff and dropping vcpu request bit for PV unhalt.
> 
> - Raghu

Looks good. Only the MSR appears an abuse, since there is no need
to expose the info to the guest.