Re: [Xen-devel] [PATCH RFC V4 2/5] kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks

[Avi Kivity <avi@xxxxxxxxxx>]

On 01/14/2012 08:25 PM, Raghavendra K T wrote:
> Add a hypercall to KVM hypervisor to support pv-ticketlocks 
>
> KVM_HC_KICK_CPU allows the calling vcpu to kick another vcpu out of halt 
> state.
>     
> The presence of these hypercalls is indicated to guest via
> KVM_FEATURE_PVLOCK_KICK/KVM_CAP_PVLOCK_KICK.
>
> Qemu needs a corresponding patch to pass up the presence of this feature to 
> guest via cpuid. Patch to qemu will be sent separately.

No need to discuss qemu in a kernel patch.

>  
> +/*
> + * kvm_pv_kick_cpu_op:  Kick a vcpu.
> + *
> + * @apicid - apicid of vcpu to be kicked.
> + */
> +static void kvm_pv_kick_cpu_op(struct kvm *kvm, int apicid)
> +{
> +     struct kvm_vcpu *vcpu = NULL;
> +     int i;
> +
> +     kvm_for_each_vcpu(i, vcpu, kvm) {
> +             if (!kvm_apic_present(vcpu))
> +                     continue;
> +
> +             if (kvm_apic_match_dest(vcpu, 0, 0, apicid, 0))
> +                     break;
> +     }
> +     if (vcpu) {
> +             kvm_make_request(KVM_REQ_PVLOCK_KICK, vcpu);
> +             kvm_vcpu_kick(vcpu);
> +     }
> +}
> +

The code that handles KVM_REQ_PVLOCK_KICK needs to be in this patch.


-- 
error compiling committee.c: too many arguments to function


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