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The remaining text in docs/barrier.txt is user-facing description of what the device is and how to use it. Move this into the system manual and rstify it. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20210727204112.12579-4-peter.maydell@linaro.org
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45 lines
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QEMU Barrier Client
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===================
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Generally, mouse and keyboard are grabbed through the QEMU video
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interface emulation.
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But when we want to use a video graphic adapter via a PCI passthrough
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there is no way to provide the keyboard and mouse inputs to the VM
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except by plugging a second set of mouse and keyboard to the host
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or by installing a KVM software in the guest OS.
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The QEMU Barrier client avoids this by implementing directly the Barrier
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protocol into QEMU.
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`Barrier <https://github.com/debauchee/barrier>`__
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is a KVM (Keyboard-Video-Mouse) software forked from Symless's
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synergy 1.9 codebase.
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This protocol is enabled by adding an input-barrier object to QEMU.
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Syntax::
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input-barrier,id=<object-id>,name=<guest display name>
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[,server=<barrier server address>][,port=<barrier server port>]
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[,x-origin=<x-origin>][,y-origin=<y-origin>]
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[,width=<width>][,height=<height>]
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The object can be added on the QEMU command line, for instance with::
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-object input-barrier,id=barrier0,name=VM-1
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where VM-1 is the name the display configured in the Barrier server
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on the host providing the mouse and the keyboard events.
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by default ``<barrier server address>`` is ``localhost``,
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``<port>`` is ``24800``, ``<x-origin>`` and ``<y-origin>`` are set to ``0``,
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``<width>`` and ``<height>`` to ``1920`` and ``1080``.
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If the Barrier server is stopped QEMU needs to be reconnected manually,
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by removing and re-adding the input-barrier object, for instance
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with the help of the HMP monitor::
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(qemu) object_del barrier0
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(qemu) object_add input-barrier,id=barrier0,name=VM-1
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