Re: [libvirt] [RFC PATCH] Add Qemu Network Helper

From: Richa Marwaha <rmarwah(a)linux.vnet.ibm.com&gt; QEMU has a new feature which allows QEMU to execute under an unprivileged user ID and still be able to add a tap device to a Linux network bridge. Below is the link to the QEMU patches for the bridge helper feature: http://lists.gnu.org/archive/html/qemu-devel/2012-01/msg03562.html The existing libvirt tap network device support for adding a tap device to a bridge (-netdev tap) works only when connected to a libvirtd instance running as the privileged system account 'root'. When connected to a libvirtd instance running as an unprivileged user (ie. using the session URI) creation of the tap device fails as follows: error: Failed to start domain F14_64 error: Unable to create tap device vnet%d: Operation not permitted With this support, creating a tap device in the above scenario will be possible. Additionally, hot attaching a tap device to a bridge while running when connected to a libvirtd instance running as an unprivileged user will be possible. Signed-off-by: Richa Marwaha <rmarwah(a)linux.vnet.ibm.com&gt; Signed-off-by: Corey Bryant&lt;coreyb(a)linux.vnet.ibm.com&gt; --- src/qemu/qemu_command.c | 38 +++++++++++++++++++++++++------------- src/qemu/qemu_command.h | 1 + src/qemu/qemu_hotplug.c | 19 +++++++++++-------- 3 files changed, 37 insertions(+), 21 deletions(-)