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[Xen-users] Black screen with 2.6.31 pv_ops

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Black screen with 2.6.31 pv_ops
From: Christopher Schramm <xen@xxxxxxxxxxxx>
Date: Thu, 03 Dec 2009 16:41:12 +0100
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Hi,

I'm running Debian squeeze with a 2.6.31 kernel which I would like to
use as dom0 in xen.

The kernel is configured with

CONFIG_PARAVIRT_GUEST=y
CONFIG_PARAVIRT=y
CONFIG_PARAVIRT_CLOCK=y
CONFIG_XEN=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=32
CONFIG_XEN_SAVE_RESTORE=y
CONFIG_XEN_BLKDEV_FRONTEND=m
CONFIG_NETXEN_NIC=m
CONFIG_XEN_NETDEV_FRONTEND=m
CONFIG_XEN_KBDDEV_FRONTEND=y
CONFIG_HVC_DRIVER=y
CONFIG_HVC_IRQ=y
CONFIG_HVC_XEN=y
CONFIG_XEN_FBDEV_FRONTEND=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=y
CONFIG_XENFS=m
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y

I've built xen.gz and xen-tools from current xen-unstable git version.

Important part of grub entry looks like this:

multiboot /boot/xen.gz
module  /boot/vmlinuz-2.6.31.6
root=UUID=64f4bee7-01c8-4db2-949e-1728524f35aa ro  quiet console=tty0
module  /boot/initrd.img-2.6.31.6

The problem: Xen starts up without problems but when dom0 should appear
there's nothing but a black screen. I'm not sure, but it doesn't seem
like the machine is working. Also it's not reachable via network.

Since the motherboard hasn't got a serial port, I cannot use Xen's
debugging. Well, I got a USB -> Serial adapter, but I wouldn't expect to
get it running on Xen. Is it possible to not show the dom0 but keep
getting Xen's output?

Or am I missing something? Is my setup broken by design?


Thanks for any hints

Christopher Schramm



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