i386/kvm: add support for Hyper-V IPI send
Hyper-V PV IPI support is merged to KVM, enable the feature in Qemu. When enabled, this allows Windows guests to send IPIs to other vCPUs with a single hypercall even when there are >64 vCPUs in the request. Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: NRoman Kagan <rkagan@virtuozzo.com> Message-Id: <20181009130853.6412-3-vkuznets@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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