Re: [PATCH] Paravirt framebuffer frontend kernel support [1/5]

[Markus Armbruster <armbru@redhat.com>]

I tried to follow your advice, but Xend hates me.  I must be doing
something stupid, can anybody help?

I created a trivial xend/server/vfbif.py:

from xen.xend.server.DevController import DevController

class VfbifController(DevController):
    """Virtual frame buffer controller. Handles all vfb devices for a domain.
    """

    def __init__(self, vm):
        DevController.__init__(self, vm)

    def getDeviceDetails(self, config):
        """@see DevController.getDeviceDetails"""
        devid = 0
        back = {}
        front = {}
        return (devid, back, front)

I added it to xend/XendDomainInfo.py, as follows:

--- XendDomainInfo.py.orig      2006-10-10 16:23:45.000000000 +0200
+++ XendDomainInfo.py   2006-11-03 14:33:28.000000000 +0100
@@ -1786,7 +1786,7 @@
     controllerClasses[device_class] = cls
 
 
-from xen.xend.server import blkif, netif, tpmif, pciif, iopif, irqif, usbif
+from xen.xend.server import blkif, netif, tpmif, pciif, iopif, irqif, usbif, vfbif
 from xen.xend.server.BlktapController import BlktapController
 addControllerClass('vbd',  blkif.BlkifController)
 addControllerClass('vif',  netif.NetifController)
@@ -1796,3 +1796,4 @@
 addControllerClass('irq',  irqif.IRQController)
 addControllerClass('usb',  usbif.UsbifController)
 addControllerClass('tap',  BlktapController)
+addControllerClass('vfb',  vfbif.VfbifController)


I set hotplug-status in the backend, resulting in this:

    # xenstore-ls /local/domain/0/backend
    vfb = ""
     1 = ""
      0 = ""
       hotplug-status = "connected"

Then I attempt to create domain 1:

    # xm create -c parafat
[pygrub screen...]
    Using config file "/etc/xen/parafat".
    Going to boot Fedora Core (2.6.18.1)
      kernel: /vmlinuz-2.6.18.1
      initrd: /initrd-2.6.18.1.img
    Error: Device 0 not connected

This is actually from configuration when it tries to read
/local/domain/1/device/vfb/0/backend-id.  /local/domain/1/device
contains entries vbd and vif, but not vfb.  Shouldn't xend have
written stuff there?

I'm confused.