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The function can be used for mapping the system physical address to virtio device address using VIRTIO_DEVICE_PROTOCOL.MapSharedBuffer (). The function helps with centralizing error handling, and it allows the caller to pass in constant or other evaluated expressions for NumberOfBytes. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Laszlo Ersek <lersek@redhat.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> [lersek@redhat.com: s/This/VirtIo/ in the new function's comment blocks] Reviewed-by: Laszlo Ersek <lersek@redhat.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>