From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Yiyi Hu" <yiyihu@gmail.com>
Subject: xen-in-kvm doesn't work with kvm-81.
Date: Wed, 17 Dec 2008 14:16:07 +0800
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Host info:
hyy@Hs ~ $ uname -a
Linux Hs 2.6.27-gentoo-r6 #1 SMP Mon Dec 15 11:43:12 CST 2008 x86_64
AMD Athlon(tm) X2 Dual Core Processor BE-2350 AuthenticAMD GNU/Linux

KVM is version 81. Installed from portage.

The guest is 64bit debian lenny, Within guest, we install the xen system.
The xen-in-kvm won't boot fine after upgraded to kvm-81.

After testing, I found:
With kvm-81 userspace util and kernel modules bundled with kernel
2.6.27, xen-in-kvm boots fine..
If I try to use the kvm module bundled with kvm-81, The xen-in-kvm
doesn't boot, with guest screen messed up.

For the combination of both kernel modules and userspace utils are from kvm-81.
With either -no-kvm-irqchip or -no-kvm-pit option passed, xen-in-kvm boots fine.
With both -no-kvm-irqchip and -no-kvm-pit options passed, xen-in-kvm
also boots fine.
Though, We can see the screen messed up when the kernel boots. But the
mess up will be cleared by newer kernel messages.

The *problem* script used to start xen-in-kvm.

TAPNAME=tap0
sudo /usr/bin/tunctl -u hyy -t $TAPNAME
sudo /sbin/ifconfig $TAPNAME up
sudo /sbin/brctl addif br0 $TAPNAME
kvm -k en-us -m 2048 \
    -daemonize \
    -vnc localhost:5 \
    -hda lenny-xen.img \
        -net nic,model=rtl8139,macaddr=DE:AD:B3:EF:27:A8 \
    -net tap,script=no,ifname=$TAPNAME \
    -serial mon:telnet::3333,server,nowait \


Thanks.