Hi all, On Wed, May 19, 2010 at 18:22, Laine Stump <laine@laine.org> wrote:
On 05/19/2010 01:49 AM, Huang, Zhiteng wrote:
Hi gurus on the list,
I'm trying to bring up a Linux with virtio vhost backend. My system is running on kernel 2.6.34-rc7, libvirt 0.8.0.
Two questions regarding to vhost:
1) XML format for vhost I didn't find any documents on libvirt.org description the XML or QMU argument format for vhost.
If you're using virtio networking, and vhost-net support is available on your system, libvirt will automatically alter the qemu commandline arguments to take advantage of it. libvirt checks for two things:
1) it runs "qemu-kvm --help" and looks for ",vhost=" in the output (demonstrating that this build of qemu supports vhost)
2) it attempts to open "/dev/vhost-net" in rw mode (demonstrating that the kernel support is there, either built into the kernel or loaded as a module).
I just tried this with libvirt 0.8.1, on a 2.6.34 kernel, and it doesn't seem to work for me. Setting a breakpoint on the qemudOpenVhostNet function shows that it returns -1, because QEMUD_CMD_FLAG_NETDEV isn't set. -netdev is disabled on qemu 0.12 Ruben