Re: [PATCH v4 0/5] KVM: x86: hyperv: PV IPI support for Windows guests

[Vitaly Kuznetsov]

Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> writes:

> Changes since v3 [Roman Kagan]:
> - Don't use vcpu_id in kvm_make_vcpus_request_mask to avoid dealing with
>   sparse CPU masks.
> - Create get_vcpu_idx_by_vpidx() and use it in get_vcpu_by_vpidx() and
>   kvm_hv_flush_tlb().
>
> Using hypercall for sending IPIs is faster because this allows to specify
> any number of vCPUs (even > 64 with sparse CPU set), the whole procedure
> will take only one VMEXIT.
>
> Same as PV TLB flush, this allows Windows guests having > 64 vCPUs to boot
> on KVM when Hyper-V extensions are enabled.

Ping)

-- 
  Vitaly