Virtual Frame Buffer for PV Xen Markus Armbruster, 2006 - PowerPoint PPT Presentation

Aug 17, 2023 •327 likes •425 views

Virtual Frame Buffer for PV Xen Markus Armbruster, 2006 armbru@redhat.com Red Hat GmbH Why and Who Why? Want a graphical console! Just like a real machine, just like FV Whodunnit? Anthony Liguori Design and initial implementation

Virtual Frame Buffer for PV Xen Markus Armbruster, 2006 armbru@redhat.com Red Hat GmbH
Why and Who Why? Want a graphical console! ☞ Just like a real machine, just like FV Whodunnit? ● Anthony Liguori Design and initial implementation ● Markus Armbruster & Jeremy Katz Flesh out, fix, extend ● The Xen Community
Architecture Similar to common split driver architecture: ● Frontend in domU: xenfb and xenkbd kernel modules ● Backend in dom0: user space VNC server ● Communicate through shared memory page and event channel shared frame buffer ● Forward compatible protocol
Shared Page & Event Channel One page for xenfb and xenkbd each, with:  Device information  Input event ring  Output event ring  Event notification on ring change
Xenkbd Events Input:  Pointer motion  Button down/up  Key down/up Output:  None defined yet Forward compatibility:  Can safely ignore unknown input events  Generate only requested output events
Xenfb Events Input:  Request to signal framebuffer update Output:  Signal framebuffer update Forward compatibility:  Can safely ignore unknown input events  Generate only requested output events
Future Work  Absolute pointer  Shadow translate mode guests  International keyboards  Dynamic resolution  Multiple frame buffers per guest  Share backend with FV  Save/Restore and Migrate
Resources  Design notes http://wiki.xensource.com/xenwiki/VirtualFramebuffer (somewhat dated)  Discussion http://lists.xensource.com/xen-devel

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