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

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