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Hyper-V extended hypercalls by default exit to userspace. Verify userspace gets the call, update the result and then verify in guest correct result is received. Add KVM_EXIT_HYPERV to list of "known" hypercalls so errors generate pretty strings. Signed-off-by: Vipin Sharma <vipinsh@google.com> Reviewed-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20221212183720.4062037-14-vipinsh@google.com [sean: add KVM_EXIT_HYPERV to exit_reasons_known] Signed-off-by: Sean Christopherson <seanjc@google.com>