path: root/docs/barrier.txt
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authorPeter Maydell <peter.maydell@linaro.org>2021-07-27 21:41:12 +0100
committerPeter Maydell <peter.maydell@linaro.org>2021-08-02 12:55:51 +0100
commit4a64939db76b10d8d41d2af3c6aad8142da55450 (patch)
treea6ddc6a7b5820a2d764a5805cc36416a5efe04fe /docs/barrier.txt
parent399a04775e7ac748834bf0431d31fdb0ae30b912 (diff)
docs: Move user-facing barrier docs into system manualpull-target-arm-20210802
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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- QEMU Barrier Client
-* About
- Barrier is a KVM (Keyboard-Video-Mouse) software forked from Symless's
- synergy 1.9 codebase.
- See https://github.com/debauchee/barrier
-* QEMU usage
- Generally, mouse and keyboard are grabbed through the QEMU video
- interface emulation.
- But when we want to use a video graphic adapter via a PCI passthrough
- there is no way to provide the keyboard and mouse inputs to the VM
- except by plugging a second set of mouse and keyboard to the host
- or by installing a KVM software in the guest OS.
- The QEMU Barrier client avoids this by implementing directly the Barrier
- protocol into QEMU.
- This protocol is enabled by adding an input-barrier object to QEMU.
- Syntax: input-barrier,id=<object-id>,name=<guest display name>
- [,server=<barrier server address>][,port=<barrier server port>]
- [,x-origin=<x-origin>][,y-origin=<y-origin>]
- [,width=<width>][,height=<height>]
- The object can be added on the QEMU command line, for instance with:
- ... -object input-barrier,id=barrier0,name=VM-1 ...
- where VM-1 is the name the display configured int the Barrier server
- on the host providing the mouse and the keyboard events.
- by default <barrier server address> is "localhost", port is 24800,
- <x-origin> and <y-origin> are set to 0, <width> and <height> to
- 1920 and 1080.
- If Barrier server is stopped QEMU needs to be reconnected manually,
- by removing and re-adding the input-barrier object, for instance
- with the help of the HMP monitor:
- (qemu) object_del barrier0
- (qemu) object_add input-barrier,id=barrier0,name=VM-1