[Pkg-xen-devel] Bug#554805: xen-utils-3.2-1: ioemu routed networking on HVM guests fails

[Cyrille Chépélov]

Package: xen-utils-3.2-1
Version: 3.2.1-2
Severity: normal

Under this Xen setup, (Linux) HVM guests fail to have network active
when
running with *routed* networking, as some hosting providers require (in
my
case, OVH).

In this scenario:
 * the host is a described below
 * the guest runs as HVM.
 * the guest runs exclusively with ioemu; virtual network drivers are
not
 available (vanilla lenny guest, xen-vnif.ko does not exist,
xen-netfront
 refuses to load despite the XenBus PCI device appearing)

What xen/qemu-dm did is to build two network interfaces:
        * vifN.0 was used to send packets from the host to the guest
        routing was enabled towards this interface. No virtual hardware
        drivers took care of this network link, so all packets ended up
        dropped.

        * tapM was used by the guest to deliver packets from its virtual
        eth0.  All packets were classified "martians" by the host and
        rejected.

The reason why this happened is that the scripts/qemu-dm script
*assumes*
only bridging is ever used, and the scripts/vif-routing *assumes* only
netfront is ever used. Here we have routing and ioemu, which causes the
failure described above.

        -- Cyrille

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (800, 'testing'), (600, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-1-xen-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages xen-utils-3.2-1 depends on:
ii  e2fslibs               1.41.9-1          ext2/ext3/ext4 file system
librari
ii  iproute                20090324-1        networking and traffic
control too
ii  libc6                  2.9-25            GNU C Library: Shared
libraries
ii  libgcrypt11            1.4.4-4           LGPL Crypto library -
runtime libr
ii  libgnutls26            2.8.4-1           the GNU TLS library -
runtime libr
ii  libncurses5            5.7+20090803-2    shared libraries for
terminal hand
ii  libsdl1.2debian        1.2.13-2          Simple DirectMedia Layer
ii  libxenstore3.0         3.4.0-2           Xenstore communications
library fo
ii  python                 2.5.4-2           An interactive high-level
object-o
ii  python-central         0.6.11            register and build utility
for Pyt
ii  udev                   146-5             /dev/ and hotplug
management daemo
ii  xen-utils-common       3.3.1-2           XEN administrative tools -
common 
ii  zlib1g                 1:1.2.3.3.dfsg-15 compression library -
runtime

Versions of packages xen-utils-3.2-1 recommends:
ii  bridge-utils                  1.4-5      Utilities for configuring
the Linu
ii  xen-hypervisor-3.2-1-amd64 [x 3.2.1-2    The Xen Hypervisor on AMD64

Versions of packages xen-utils-3.2-1 suggests:
pn  xen-docs-3.2                  <none>     (no description available)

-- no debconf information
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.alioth.debian.org/pipermail/pkg-xen-devel/attachments/20091106/fd00540c/attachment.htm>