Re: [Qemu-devel] [PATCH 3/3] QEMU kvm/i386 : Adding KICK_VCPU capability support in i386 target.

[Alexander Graf]

On 04.12.2011, at 19:26, Raghavendra K T wrote:

> Extend the KVM Hypervisor to enable KICK_VCPU feature that allows
> a vcpu to kick the halted vcpu to continue with execution in PV ticket
> spinlock.
> 
> Signed-off-by: Srivatsa Vaddagiri <address@hidden>
> Signed-off-by: Raghavendra K T <address@hidden>
> ---
> diff --git a/target-i386/kvm.c b/target-i386/kvm.c
> index 5bfc21f..69bce21 100644
> --- a/target-i386/kvm.c
> +++ b/target-i386/kvm.c
> @@ -97,6 +97,7 @@ struct kvm_para_features {
>     { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY },
>     { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
>     { KVM_CAP_ASYNC_PF, KVM_FEATURE_ASYNC_PF },
> +    { KVM_CAP_KICK_VCPU, KVM_FEATURE_KICK_VCPU },

So this is handled in the kernel? Who enables the feature? Is it always on? Why 
bother with it in user space at all then?


Alex