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Keir Fraser
3bc128ebcf
This patch adds a paravirt machine type to QEMU. This can be requested by passing the arg '-M xenpv' to qemu-dm. Aside from -d, and -domain-name, the only other args that are processed are the VNC / SDL graphics related args. Any others will be ignored. A tweak to helper2.c was made to stop it setting up a file handler watch when there are no CPUs registered. The paravirt machine is in hw/xen_machine_pv.c and registers an instance of the xenfb class, integrating it with the QEMU event loop and key/mouse handlers. A couple of methods were adding to xenfb.h to allow direct access to the file handles for xenstore & the event channel. The vfbif.py device controller is modified to launch qemu-dm instead of the old xen-vncfb / sdlfb daemons. When receiving framebuffer updates from the guest, the update has to be copied into QEMU's copy of the framebuffer. This is because QEMU stores the framebuffer in the format that is native to the SDL display, or VNC client. This is not neccessarily the same as the guest framebuffer which is always 32bpp. If there is an exact depth match we use memcpy for speed, but in the non-matching case we have to fallback to slow code to convert pixel formats. It fully supports all features of the paravirt framebuffer including the choice between absolute & relative pointers. The overall VIRT memory image size is about same as old xen-vncfb, but the resident memory size is a little increased due to copy of the framebuffer & some QEMU static state overhead. Most of this is shared across QEMU processes. To avoid both moving the xenfb.c and making changes to it in the same patch, this just uses a Makefile hack to link against the xenfb.o from the tools/xenfb/ directory. This will be removed in the following patch. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The file test.py here is from the Zope project, and is Copyright (c) 2001, 2002 Zope Corporation and Contributors. This file is released under the Zope Public License, version 2.0, a copy of which is in the file ZPL-2.0.