KVM: introduce kvm_make_vcpus_request_mask() API
Hyper-V style PV TLB flush hypercalls inmplementation will use this API. To avoid memory allocation in CONFIG_CPUMASK_OFFSTACK case add cpumask_var_t argument. Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com>
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