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[Xen-changelog] [xen-unstable] xend: notify xenpv device model that cons

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Subject: [Xen-changelog] [xen-unstable] xend: notify xenpv device model that console info is ready
From: Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 24 Feb 2010 03:20:19 -0800
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# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1267004315 0
# Node ID 351a34c2fd48a362dc5339db44916c4478c2564d
# Parent  4ba4323889b970368675c57417dea94076536431
xend: notify xenpv device model that console info is ready

Sometimes PV domain with vfb doesn't boot up. /sbin/kudzu is stuck.
After investigation, I've found that the evtchn for console is not
bound at all.

Normal sequence of evtchn initialization in qemu-dm for xenpv is:
1) watch xenstore backpath (/local/domain/0/backend/console/<domid>/0)
2) read console info (/local/domain/<domid>/console/{type, ring-ref,
3) bind the evtchn to the port.

But in some case, xend writes to the backpath before the console info
is prepared, and never write to the backpath again. So the qemu-dm
fails at 2) and never reach to 3).

When this happens, manually xenstore-write command on Domain-0
resumes the guest.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
 tools/python/xen/xend/XendDomainInfo.py |    5 +++++
 1 files changed, 5 insertions(+)

diff -r 4ba4323889b9 -r 351a34c2fd48 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py   Mon Feb 22 18:47:22 2010 +0000
+++ b/tools/python/xen/xend/XendDomainInfo.py   Wed Feb 24 09:38:35 2010 +0000
@@ -1642,6 +1642,11 @@ class XendDomainInfo:
                 console_uuid = serial_consoles[0].get('uuid')
                 self.info.console_update(console_uuid, 'location',
+                # Notify xenpv device model that console info is ready
+                if not self.info.is_hvm() and self.info.has_rfb():
+                    console_ctrl = self.getDeviceController('console')
+                    # The value is unchanged. Just for xenstore watcher
+                    console_ctrl.writeBackend(0, 'uuid', console_uuid)
         # Update VNC port if it exists and write to xenstore

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